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  Subjects -> ELECTRONICS (Total: 207 journals)
Showing 1 - 200 of 277 Journals sorted alphabetically
Acta Electronica Malaysia     Open Access  
Advanced Materials Technologies     Hybrid Journal   (Followers: 1)
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 8)
Advances in Electrical and Electronic Engineering     Open Access   (Followers: 9)
Advances in Electronics     Open Access   (Followers: 100)
Advances in Magnetic and Optical Resonance     Full-text available via subscription   (Followers: 8)
Advances in Microelectronic Engineering     Open Access   (Followers: 13)
Advances in Power Electronics     Open Access   (Followers: 40)
Advancing Microelectronics     Hybrid Journal  
American Journal of Electrical and Electronic Engineering     Open Access   (Followers: 28)
Annals of Telecommunications     Hybrid Journal   (Followers: 9)
APSIPA Transactions on Signal and Information Processing     Open Access   (Followers: 9)
Archives of Electrical Engineering     Open Access   (Followers: 16)
Australian Journal of Electrical and Electronics Engineering     Hybrid Journal  
Batteries     Open Access   (Followers: 9)
Batteries & Supercaps     Hybrid Journal   (Followers: 5)
Bell Labs Technical Journal     Hybrid Journal   (Followers: 31)
Bioelectronics in Medicine     Hybrid Journal  
Biomedical Instrumentation & Technology     Hybrid Journal   (Followers: 6)
BULLETIN of National Technical University of Ukraine. Series RADIOTECHNIQUE. RADIOAPPARATUS BUILDING     Open Access   (Followers: 2)
Bulletin of the Polish Academy of Sciences : Technical Sciences     Open Access   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 47)
China Communications     Full-text available via subscription   (Followers: 9)
Chinese Journal of Electronics     Hybrid Journal  
Circuits and Systems     Open Access   (Followers: 15)
Consumer Electronics Times     Open Access   (Followers: 5)
Control Systems     Hybrid Journal   (Followers: 306)
ECTI Transactions on Computer and Information Technology (ECTI-CIT)     Open Access  
ECTI Transactions on Electrical Engineering, Electronics, and Communications     Open Access   (Followers: 2)
Edu Elektrika Journal     Open Access   (Followers: 1)
Electrica     Open Access  
Electronic Design     Partially Free   (Followers: 124)
Electronic Markets     Hybrid Journal   (Followers: 7)
Electronic Materials Letters     Hybrid Journal   (Followers: 4)
Electronics     Open Access   (Followers: 109)
Electronics and Communications in Japan     Hybrid Journal   (Followers: 10)
Electronics For You     Partially Free   (Followers: 103)
Electronics Letters     Hybrid Journal   (Followers: 26)
Elektronika ir Elektortechnika     Open Access   (Followers: 1)
Elkha : Jurnal Teknik Elektro     Open Access  
Emitor : Jurnal Teknik Elektro     Open Access   (Followers: 1)
Energy Harvesting and Systems     Hybrid Journal   (Followers: 4)
Energy Storage     Hybrid Journal   (Followers: 1)
Energy Storage Materials     Full-text available via subscription   (Followers: 4)
EPE Journal : European Power Electronics and Drives     Hybrid Journal  
EPJ Quantum Technology     Open Access   (Followers: 1)
EURASIP Journal on Embedded Systems     Open Access   (Followers: 11)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Foundations and Trends® in Communications and Information Theory     Full-text available via subscription   (Followers: 6)
Foundations and Trends® in Signal Processing     Full-text available via subscription   (Followers: 10)
Frequenz     Hybrid Journal   (Followers: 1)
Frontiers of Optoelectronics     Hybrid Journal   (Followers: 1)
IACR Transactions on Symmetric Cryptology     Open Access   (Followers: 1)
IEEE Antennas and Propagation Magazine     Hybrid Journal   (Followers: 101)
IEEE Antennas and Wireless Propagation Letters     Hybrid Journal   (Followers: 82)
IEEE Embedded Systems Letters     Hybrid Journal   (Followers: 57)
IEEE Journal of Electromagnetics, RF and Microwaves in Medicine and Biology     Hybrid Journal   (Followers: 3)
IEEE Journal of Emerging and Selected Topics in Power Electronics     Hybrid Journal   (Followers: 52)
IEEE Journal of the Electron Devices Society     Open Access   (Followers: 9)
IEEE Journal on Exploratory Solid-State Computational Devices and Circuits     Hybrid Journal   (Followers: 1)
IEEE Letters on Electromagnetic Compatibility Practice and Applications     Hybrid Journal   (Followers: 4)
IEEE Magnetics Letters     Hybrid Journal   (Followers: 7)
IEEE Nanotechnology Magazine     Hybrid Journal   (Followers: 42)
IEEE Open Journal of Circuits and Systems     Open Access   (Followers: 3)
IEEE Open Journal of Industry Applications     Open Access   (Followers: 3)
IEEE Open Journal of the Industrial Electronics Society     Open Access   (Followers: 3)
IEEE Power Electronics Magazine     Full-text available via subscription   (Followers: 77)
IEEE Pulse     Hybrid Journal   (Followers: 5)
IEEE Reviews in Biomedical Engineering     Hybrid Journal   (Followers: 23)
IEEE Solid-State Circuits Letters     Hybrid Journal   (Followers: 3)
IEEE Solid-State Circuits Magazine     Hybrid Journal   (Followers: 13)
IEEE Transactions on Aerospace and Electronic Systems     Hybrid Journal   (Followers: 366)
IEEE Transactions on Antennas and Propagation     Full-text available via subscription   (Followers: 74)
IEEE Transactions on Automatic Control     Hybrid Journal   (Followers: 62)
IEEE Transactions on Autonomous Mental Development     Hybrid Journal   (Followers: 8)
IEEE Transactions on Biomedical Engineering     Hybrid Journal   (Followers: 39)
IEEE Transactions on Broadcasting     Hybrid Journal   (Followers: 13)
IEEE Transactions on Circuits and Systems for Video Technology     Hybrid Journal   (Followers: 26)
IEEE Transactions on Consumer Electronics     Hybrid Journal   (Followers: 46)
IEEE Transactions on Electron Devices     Hybrid Journal   (Followers: 19)
IEEE Transactions on Geoscience and Remote Sensing     Hybrid Journal   (Followers: 224)
IEEE Transactions on Haptics     Hybrid Journal   (Followers: 5)
IEEE Transactions on Industrial Electronics     Hybrid Journal   (Followers: 75)
IEEE Transactions on Industry Applications     Hybrid Journal   (Followers: 40)
IEEE Transactions on Information Theory     Hybrid Journal   (Followers: 27)
IEEE Transactions on Learning Technologies     Full-text available via subscription   (Followers: 12)
IEEE Transactions on Power Electronics     Hybrid Journal   (Followers: 80)
IEEE Transactions on Services Computing     Hybrid Journal   (Followers: 4)
IEEE Transactions on Signal and Information Processing over Networks     Hybrid Journal   (Followers: 14)
IEEE Transactions on Software Engineering     Hybrid Journal   (Followers: 79)
IEEE Women in Engineering Magazine     Hybrid Journal   (Followers: 11)
IEEE/OSA Journal of Optical Communications and Networking     Hybrid Journal   (Followers: 16)
IEICE - Transactions on Electronics     Full-text available via subscription   (Followers: 12)
IEICE - Transactions on Information and Systems     Full-text available via subscription   (Followers: 5)
IET Cyber-Physical Systems : Theory & Applications     Open Access   (Followers: 1)
IET Energy Systems Integration     Open Access   (Followers: 1)
IET Microwaves, Antennas & Propagation     Hybrid Journal   (Followers: 36)
IET Nanodielectrics     Open Access  
IET Power Electronics     Hybrid Journal   (Followers: 60)
IET Smart Grid     Open Access   (Followers: 1)
IET Wireless Sensor Systems     Hybrid Journal   (Followers: 18)
IETE Journal of Education     Open Access   (Followers: 4)
IETE Journal of Research     Open Access   (Followers: 11)
IETE Technical Review     Open Access   (Followers: 13)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Industrial Technology Research Journal Phranakhon Rajabhat University     Open Access  
Informatik-Spektrum     Hybrid Journal   (Followers: 2)
Instabilities in Silicon Devices     Full-text available via subscription   (Followers: 1)
Intelligent Transportation Systems Magazine, IEEE     Full-text available via subscription   (Followers: 14)
International Journal of Advanced Research in Computer Science and Electronics Engineering     Open Access   (Followers: 18)
International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems     Open Access   (Followers: 12)
International Journal of Antennas and Propagation     Open Access   (Followers: 11)
International Journal of Applied Electronics in Physics & Robotics     Open Access   (Followers: 4)
International Journal of Computational Vision and Robotics     Hybrid Journal   (Followers: 5)
International Journal of Control     Hybrid Journal   (Followers: 11)
International Journal of Electronics     Hybrid Journal   (Followers: 7)
International Journal of Electronics and Telecommunications     Open Access   (Followers: 13)
International Journal of Granular Computing, Rough Sets and Intelligent Systems     Hybrid Journal   (Followers: 3)
International Journal of High Speed Electronics and Systems     Hybrid Journal  
International Journal of Hybrid Intelligence     Hybrid Journal  
International Journal of Image, Graphics and Signal Processing     Open Access   (Followers: 16)
International Journal of Microwave and Wireless Technologies     Hybrid Journal   (Followers: 10)
International Journal of Nanoscience     Hybrid Journal   (Followers: 1)
International Journal of Numerical Modelling: Electronic Networks, Devices and Fields     Hybrid Journal   (Followers: 4)
International Journal of Power Electronics     Hybrid Journal   (Followers: 25)
International Journal of Review in Electronics & Communication Engineering     Open Access   (Followers: 4)
International Journal of Sensors, Wireless Communications and Control     Hybrid Journal   (Followers: 10)
International Journal of Systems, Control and Communications     Hybrid Journal   (Followers: 4)
International Journal of Wireless and Microwave Technologies     Open Access   (Followers: 6)
International Transaction of Electrical and Computer Engineers System     Open Access   (Followers: 2)
JAREE (Journal on Advanced Research in Electrical Engineering)     Open Access  
Journal of Biosensors & Bioelectronics     Open Access   (Followers: 4)
Journal of Advanced Dielectrics     Open Access   (Followers: 1)
Journal of Artificial Intelligence     Open Access   (Followers: 12)
Journal of Circuits, Systems, and Computers     Hybrid Journal   (Followers: 4)
Journal of Computational Intelligence and Electronic Systems     Full-text available via subscription   (Followers: 1)
Journal of Electrical and Electronics Engineering Research     Open Access   (Followers: 38)
Journal of Electrical Bioimpedance     Open Access  
Journal of Electrical Bioimpedance     Open Access   (Followers: 2)
Journal of Electrical Engineering & Electronic Technology     Hybrid Journal   (Followers: 7)
Journal of Electrical, Electronics and Informatics     Open Access  
Journal of Electromagnetic Analysis and Applications     Open Access   (Followers: 8)
Journal of Electromagnetic Waves and Applications     Hybrid Journal   (Followers: 9)
Journal of Electronic Design Technology     Full-text available via subscription   (Followers: 6)
Journal of Electronic Science and Technology     Open Access   (Followers: 1)
Journal of Electronics (China)     Hybrid Journal   (Followers: 5)
Journal of Energy Storage     Full-text available via subscription   (Followers: 4)
Journal of Engineered Fibers and Fabrics     Open Access   (Followers: 2)
Journal of Field Robotics     Hybrid Journal   (Followers: 4)
Journal of Guidance, Control, and Dynamics     Hybrid Journal   (Followers: 185)
Journal of Information and Telecommunication     Open Access   (Followers: 1)
Journal of Intelligent Procedures in Electrical Technology     Open Access   (Followers: 3)
Journal of Low Power Electronics     Full-text available via subscription   (Followers: 10)
Journal of Low Power Electronics and Applications     Open Access   (Followers: 10)
Journal of Microelectronics and Electronic Packaging     Hybrid Journal   (Followers: 1)
Journal of Microwave Power and Electromagnetic Energy     Hybrid Journal   (Followers: 3)
Journal of Microwaves, Optoelectronics and Electromagnetic Applications     Open Access   (Followers: 11)
Journal of Nuclear Cardiology     Hybrid Journal  
Journal of Optoelectronics Engineering     Open Access   (Followers: 4)
Journal of Physics B: Atomic, Molecular and Optical Physics     Hybrid Journal   (Followers: 32)
Journal of Power Electronics     Hybrid Journal   (Followers: 2)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 11)
Journal of Semiconductors     Full-text available via subscription   (Followers: 5)
Journal of Sensors     Open Access   (Followers: 27)
Journal of Signal and Information Processing     Open Access   (Followers: 9)
Jurnal ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer     Open Access  
Jurnal Rekayasa Elektrika     Open Access  
Jurnal Teknik Elektro     Open Access  
Jurnal Teknologi Elektro     Open Access  
Kinetik : Game Technology, Information System, Computer Network, Computing, Electronics, and Control     Open Access  
Majalah Ilmiah Teknologi Elektro : Journal of Electrical Technology     Open Access   (Followers: 2)
Metrology and Measurement Systems     Open Access   (Followers: 6)
Microelectronics and Solid State Electronics     Open Access   (Followers: 28)
Nanotechnology, Science and Applications     Open Access   (Followers: 6)
Nature Electronics     Hybrid Journal   (Followers: 1)
Networks: an International Journal     Hybrid Journal   (Followers: 5)
Open Electrical & Electronic Engineering Journal     Open Access  
Open Journal of Antennas and Propagation     Open Access   (Followers: 9)
Paladyn. Journal of Behavioral Robotics     Open Access   (Followers: 1)
Power Electronics and Drives     Open Access   (Followers: 2)
Problemy Peredachi Informatsii     Full-text available via subscription  
Progress in Quantum Electronics     Full-text available via subscription   (Followers: 7)
Radiophysics and Quantum Electronics     Hybrid Journal   (Followers: 2)
Recent Advances in Communications and Networking Technology     Hybrid Journal   (Followers: 4)
Recent Advances in Electrical & Electronic Engineering     Hybrid Journal   (Followers: 11)
Research & Reviews : Journal of Embedded System & Applications     Full-text available via subscription   (Followers: 6)
Revue Méditerranéenne des Télécommunications     Open Access  
Security and Communication Networks     Hybrid Journal   (Followers: 2)
Selected Topics in Applied Earth Observations and Remote Sensing, IEEE Journal of     Hybrid Journal   (Followers: 57)
Semiconductors and Semimetals     Full-text available via subscription   (Followers: 1)
Sensing and Imaging : An International Journal     Hybrid Journal   (Followers: 2)
Solid State Electronics Letters     Open Access  
Solid-State Electronics     Hybrid Journal   (Followers: 9)
Superconductor Science and Technology     Hybrid Journal   (Followers: 3)
Synthesis Lectures on Power Electronics     Full-text available via subscription   (Followers: 3)
Technical Report Electronics and Computer Engineering     Open Access  
TELE     Open Access  
Telematique     Open Access  
TELKOMNIKA (Telecommunication, Computing, Electronics and Control)     Open Access   (Followers: 9)
Transactions on Cryptographic Hardware and Embedded Systems     Open Access   (Followers: 1)

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Similar Journals
Journal Cover
Electronic Materials Letters
Journal Prestige (SJR): 0.704
Citation Impact (citeScore): 2
Number of Followers: 4  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1738-8090 - ISSN (Online) 2093-6788
Published by Springer-Verlag Homepage  [2626 journals]
  • Hydroxyapatite Nano-Rods/Chitosan Modified Glassy Carbon Electrode for
           Cu(II) Ions Determination
    • Abstract: In this work, we propose a simple approach for fabrication of an electrochemical sensor for copper (II) ion determination in aqueous solution based on using a hydroxyapatite nano-rods/chitosan (HA/CS) nanocomposite coated on glassy carbon electrode (GCE) surface. Firstly, hydroxyapatite (HA) nano-rods has been synthesized by a simple precipitation reactions using Ca(OH)2 slurry and orthophosphoric acid (H3PO4) as precursors. After that, as-synthesized HA was dispersed into chitosan (CS) matrix to HA/CS-modify GCE by a drop casting technique. Characteristic of HA and HA/CS coating on GCE have been analysed by Transmission/Scanning Electron Microscope (TEM/SEM), X-ray Diffraction (XRD) and Fourier-Transform infrared spectroscopy (FT-IR) techniques. Electrochemical activities of neat GCE, CS-modified GCEs (GCE/CS) and HA/CS-modified GCE (GCE/HA/CS) have been evaluated in sodium acetate (NaAc-HAc) buffer with presence/absence of Ni2+, Co2+ or Cu2+ ions to test whether sensitive and selective of these developed Cu2+ sensors. Evaluated results demonstrated that GCE/HA/CS sensor has a sensitivity to Cu2+ ion of 7.688 ± 0.5324 µA mM− 1, it is the most sensitive to Cu2+ ions compared with GCE or GCE/CS. In additional, proposed Cu2+ electrochemical sensor has been applied to determine Cu2+ ions concentration in tap water with a high recoveries was found. Graphic
      PubDate: 2020-05-23
  • Microstructure Design of Carbon-Coated Nb 2 O 5 –Si Composites as
           Reversible Li Storage Materials
    • Abstract: We report on a rationally designed microsphere composite consisting of Nb2O5 and Si nanoparticles for application to secondary Li batteries as an anode material. The micron-sized spherical Nb2O5–Si composite was first prepared using a solvothermal method with appropriate surfactants. Heat treatment was performed to achieve both crystallization of Nb2O5 and pyrolysis of the carbon precursor, yielding a carbon-coated Nb2O5–Si microsphere composite. To characterize the synthesized material, X-ray diffraction, electron microscopy, and X-ray photoelectron spectroscopy were employed. The electrochemical test results demonstrated that the composite electrode delivered a high capacity of approximately 900 mAh g−1 after 100 cycles. This improved cycling stability can be attributed to the microstructure. In the microsphere composite, Si nanoparticles play a role as the main active material for Li storage; however, they suffer large volume changes during Li insertion and extraction cycling. In our composite material, crystallized orthorhombic Nb2O5 buffers the volume change and facilitates rapid Li transport through its microspheres. Additionally, the carbon coating layer acts as a secondary buffering medium and propels fast electronic/ionic transport. Graphic
      PubDate: 2020-05-22
  • Aspect Ratio Control of Copper Nanowire via Solution Process and Its
           Flexible Transparent Conductive Electrode Applications
    • Abstract: Controlling aspect ratio of copper (Cu) nanowire (NW) is a vital role to determine the conductivity at a high transmittance for the transparent conductive electrode application, but systemic studies on aspect ratio control of Cu NW have been still in early stages. Herein, we systemically explore the aspect ratio of Cu NW by varying solution process parameters including reaction time and the concentration of additives (Cu precursor, reducing agent, and capping agent). From optimized process parameters, we successfully synthesize Cu NWs showing the high aspect ratio of ~ 1570, which is relatively comparable than that of previous reports. We characterize the sheet resistance with different transmittances, and consequently achieve excellent sheet resistance of 46 Ω sq−1 at transmittance = 93%, similar to that of indium tin oxide-based electrodes. Obtained Cu NW films also show stable bending reliability with applying bending radius of 6.5 mm. Such remarkable performances are attributed to high aspect ratio of our Cu NWs, which lead to reduced junction resistance in films. Graphic
      PubDate: 2020-05-22
  • Transient Liquid Phase Sintering of Ni and Sn-58Bi on Microstructures and
           Mechanical Properties for Ni–Ni Bonding
    • Abstract: Transient liquid phase sintering (TLPS), which is a combined bonding technology of sintering and transient liquid phase bonding, is considered to be a promising sic. die attach material owing to its excellent mechanical properties and low cost. To prevent the oxidation problem, Ni is typically plated onto direct bonded copper and sic. chip. In this study, we investigated the Ni–Ni bonding by adapting TLPS method using Ni and Sn-58Bi. The bonding temperature and time were 220 °C and 60 min, respectively. In addition, the bonding atmosphere was maintained in air without bonding pressure. To confirm the bonding reliability, high-temperature storage test was conducted at 200 °C for 1000 h. With an increase in the remelting temperature to 271 °C, the bonding strength of the TLPS joint of 20 wt% Ni case was about 15 MPa. In addition, the bonding strength decreased by approximately 32% after the high-temperature storage test for 1000 h. In conclusion, Ni–Ni bonding was successfully achieved by the TLPS of Sn-58Bi with Ni. Graphic The high-heat endurance bonding between Ni to Ni was achieved by transient liquid phase sintering bonding using Ni and Sn-58Bi. By the sintering reaction between Ni, and the intermetallic reaction of Ni, Sn, and Bi, the remelting temperature increased from 139 to 271 °C. This bonding method can be applied in SiC die attachment technology.
      PubDate: 2020-05-21
  • Fabrication of Novel Ag Flake Composite Films Using a CMC/PEI
           Cross-Linking Process
    • Abstract: The multifunctional properties of cross-liked carboxymethlycellulose (CMC) and polyethyleneimine (PEI) films with varied CMC:PEI ratios and Ag flake sizes were studied. Both the CMC and PEI were cross-linked through a sonication process to achieve dispersive equilibrium. Fourier-transform infrared spectroscopy (FT-IR) was used to identify the functional groups in the sample material, with thermogravimetric analysis and differential scanning calorimetry used to investigate the overall thermal behavior of the CMC–PEI cross-linked films. Thermal diffusivity and thermal conductivity were also analyzed using laser flash analysis. To analyze the effects of Ag flakes as a filler material, the distribution of the Ag flakes within the film was determined using scanning electron microscopy. The thermal conductivity and resistance of the CMC films increased when cross-linked with 20% PEI. The electrical and thermal properties of the films also improved with the addition of Ag flakes. Graphic The multifunctional properties of cross-liked carboxymethlycellulose and polyethyleneimine films with varied CMC:PEI ratios and Ag flake sizes were studied. The thermal, electrical and mechanical properties of solder joints were investigated by using various kinds of tests.
      PubDate: 2020-05-07
  • Three-Dimensional Periodic Structured Absorber for Broadband
           Electromagnetic Radiation Absorption
    • Abstract: This study provides a novel broadband gypsum composite for electromagnetic (EM) radiation protection by the design of 3D circular periodic structure, and using carbon black (CB) as absorbent. The EM absorption performance was investigated by arch reflecting method in 2–18 GHz, and the obtained results indicate that the proposed gypsum absorber exhibits more than 90% absorption of EM radiation in the frequency range of 2–18 GHz. The EM wave absorption can be obviously affected by the variation of CB content, periodic cylinder height and diameter. The optimum CB content is 2 wt%, simultaneously, the absorption peak can be promoted to shift to lower frequency by the increase of periodic cylinder height and the increase of periodic cylinder diameter is beneficial to widen the effective bandwidth. The λ/4 interference of reflected waves, energy dissipation of CB particles, and multi-reflection, resonance, edge diffractions, and impedance matching caused by 3D periodic structural design work synergistically to achieve the high EM absorption efficiency and wide frequency band. It is expected that the proposed 3D circular periodic structured gypsum absorber has great potential in indoor EM radiation prevent. Graphic
      PubDate: 2020-05-06
  • Electrospun Ag-Doped SnO 2 Hollow Nanofibers with High Antibacterial
    • Abstract: With the continuous improvement in medical science in modern times, the spread of bacterial infection has become a matter of global concern. Therefore, the search for biological medical materials with antibacterial function has become a focus of intense research. In this work, pure SnO2 and Ag-doped SnO2 hollow nanofibers were fabricated by a combination of an electrospinning method and a calcination procedure, and the effects of the doped Ag on antibacterial activity and catalytic antibacterial activity were subsequently investigated. Through the process of high-temperature calcination, a high heating rate would lead to the formation of a hollow tubular structure in SnO2 fibers, and Ag2O would be reduced to Ag0 by a facile process with appropriate thermal treatment. Additionally, the existence of SnO2 as a tetragonal rutile structure was confirmed. On the basis of pure SnO2, doping with Ag greatly improved the antibacterial activity and catalytic antibacterial activity of hollow nanofibers. The formation mechanism and the antibacterial mechanism of pure SnO2 and Ag-doped hollow nanofibers are also discussed. This study has broad application prospects for biological medicine. Graphic
      PubDate: 2020-05-01
  • Efficient and Stable Ideal Bandgap Perovskite Solar Cell Achieved by a
           Small Amount of Tin Substituted Methylammonium Lead Iodide
    • Abstract: Ideal bandgap ~ 1.4 eV of lead–tin (Pd–Sn) organic–inorganic hybrid perovskite absorber is essential to further enhance the power conversion efficiency of perovskite solar cells (PVSCs). However, due to the facile oxidation of Sn2+, large amount of Sn substituted Pb based PVSCs suffer with low stability in ambient environment. In this work, we realize an ideal bandgap perovskite by introducing a small amount (10 mol%) of Sn2+ to methylammonium lead iodide (MAPbI3). A large grain size MAPb0.9Sn0.1I3 films with strong absorbance can be obtained. As a result, the best performance up to 18.3% efficiency is achieved. Importantly, the MAPb0.9Sn0.1I3 cell retains 90% of its performance after operation at the maximum power point under full 1-sun illumination for 500 h, in contrast to the quick degradation of MAPbI3 cell. This study demonstrates the promising potential of stable and efficient ideal band-gap Pb–Sn PVSCs. Graphic
      PubDate: 2020-05-01
  • Electric Field Induced Dissociation of SiC Thin Films Leading to the
           Formation of Nanocrystalline Graphite
    • Abstract: Thin film Au–SiC–Cu and Au–SiC–Pt crossbar structures of 40μmx40μm size where all three layers are 100 nm thickness were fabricated by lithography. Decomposition of the SiC film is observed under the influence of an electric field (104–106 V/cm) applied between the Au bottom electrode and the top metal electrode (Cu or Pt) for a few cycles during the course of testing as a resistive switching structure. This is evidenced using Raman mapping and Raman spectroscopy techniques. The Raman spectra reveal peaks corresponding to the D and G bands of nanocrystalline graphite. Raman mapping at different locations indicates that most of the graphite forms at the interface between the metal electrode and SiC. Raman mapping images reveal the formation of graphite on the surface. This technique is simple and enables site-selective localized growth of nanocrystalline graphite which is expected to impact many nanoscale applications. It could also be extended to form graphene at the nanoscale. Graphic
      PubDate: 2020-05-01
  • Effect of Microstructure Features on the Corrosion Behavior of the
           Sn-2.1 wt%Mg Solder Alloy
    • Abstract: The Sn–Mg eutectic alloy is a potential replacement for the traditional Sn-38.1 wt%Pb solder alloy, since lead has been banned because of its risk to human health and the environment. However, studies in the literature related to the Sn-2.1 wt%Mg alloy are restricted to mechanical, electrical and thermal properties. Therefore, this study aims to evaluate the corrosion behavior of this alloy, as a function of the microstructural arrangement obtained from directional solidification performed in a transient heat extraction regime. The thermal solidification parameters (solidification growth rate and cooling rate) were determined along the length of the casting for correlations with microstructural features. The resulting microstructure was characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray diffraction. Subsequently, the electrochemical impedance spectroscopy, linear polarization, equivalent circuit and evolution of hydrogen release analyzes were performed to evaluate the corrosion behavior of the samples in a 0.5 M NaCl solution at 25 °C. Interphase spacing and Mg2Sn fraction were found to influence the corrosion behavior, showing higher corrosion resistance for a more refined microstructure. Graphic
      PubDate: 2020-05-01
  • Copper Oxide Thin Films Synthesized by SILAR: Role of Varying Annealing
    • Abstract: To coat CuO thin films on the glass surface, an easily controlled successive ionic layer absorption and reaction method was used. CuO thin films were grown at room temperature. The CuO thin films obtained were annealed for 30 min at 200, 300 and 400 °C. The changes caused by annealing temperature on nanostructured CuO thin films were studied. Structural, morphological, optical and molecular properties of annealed CuO thin films were investigated. For this analysis, X-ray diffraction, Scanning electron microscopy, Atomic force microscopy, RAMAN and Optical absorption spectroscopy (UV–Vis) and Fourier transform infrared spectroscopy devices were used. Graphic
      PubDate: 2020-05-01
  • Effect of Bipolar Charging of SiH 4 on the Growth Rate and Crystallinity
           of Silicon Films Grown in the Atmospheric Pressure Chemical Vapor
           Deposition Process
    • Abstract: Increasing the growth rate of thin films and enhancing the film quality have been an issue in the semiconductor manufacturing process. To improve those properties, conventionally the deposition temperature in reactor was increased or a catalyst was added to decompose precursors at low temperature. Here, a new technology utilizing a bipolar carbon fiber ionizer (CFI) was used to achieve a high growth rate and quality of silicon films. The deposition behavior of atmospheric pressure chemical vapor deposition silicon films deposited with and without the bipolar CFI system was compared. The growth rate of silicon films deposited at 450 °C, 500 °C, 700 °C, 900 °C and 1100 °C with the bipolar CFI system was 3.4, 5.6, 3.2, 3.3 and 1.3 times higher than deposited silicon film without the bipolar CFI system. The bipolar CFI system could also improve the crystallinity of the silicon film deposited at 900 °C. Graphic
      PubDate: 2020-04-28
  • Investigation of Structural, Optical and Electrical Transport Properties
           of Yttrium Doped La 0.7 Ca 0.3 MnO 3 Perovskites
    • Abstract: In the present study, bulk samples of yttrium doped La0.7−xYxCa0.3MnO3 (x = 0.3 and 0.4) are prepared through solid-state reaction route. The structural, optical and electrical transport properties have been explored through various analytical techniques. The x-ray diffraction (XRD) patterns affirm single phase and polycrystalline nature of the samples. Rietveld refinement analysis of the XRD data is used to determine the various structural parameters. It reveals that both the samples belong to orthorhombic crystal system with Pnma space group. Using Scherrer’s equation, a lower value of crystallite size is found in the higher concentration of yttrium doped sample. The band gap as determined from the UV–visible DRS data by employing the Tauc’s relation is found to enhance with the increase of yttrium concentration in La0.7Ca0.3MnO3. The low temperature resistivity measurements establish semiconducting nature of the samples over the temperature range of ~ 110–300 K. Moreover, the electrical resistivity data are interpreted within the variable range hopping (VRH) model to estimate the density of states at the Fermi level N(EF), mean hopping distance Rh(T) and hopping energy Eh(T). It is observed that the electrical quantities vary gradually with the change of Y content. The conduction mechanism in this system is governed in the framework of thermally activated small polaron hopping (SPH) model and accordingly various parameters namely Debye temperature (θD), activation energy (Ep) and optical phonon frequency (νph) are evaluated. The obtained results support a strong connection between structure and electrical behavior in our samples and can be elucidated on the basis of localization of charge carriers induced by the substituting ions. Graphic
      PubDate: 2020-04-08
  • Modified Inverted Layer Processing of Ultrathin Touch Sensor Impregnating
           Ag Nanowires with Both Enlarged Surface Coverage of Conductive Pathways
           and Ultralow Roughness
    • Abstract: Although previous studies have shown that Ag nanowire (AgNW) is among the most powerful means to replace the brittle indium tin oxide, physically flexible devices using AgNWs are not yet available on the market mainly because of the insufficient mechanical robustness of the AgNW-based electrodes. Here we propose a modified inverted layer processing (ILP) to fabricate mechanically robust, near-foldable transparent conductors by totally impregnating AgNWs just under the surface of cured polyvinyl butyral (PVB). A single demerit of the original ILP, low surface coverage of conductive pathways, was resolved by photo-induced heating of the AgNWs to settle them on a temporary substrate before coating and curing of the PVB. This resulted in wide coverage of conducting pathways on the surface of the AgNWs/PVB without compromising the ultralow surface roughness. Furthermore, the high strength and excellent compatibility of the PVB with the AgNWs facilitated the preparation of near-foldable touch sensors. Graphic
      PubDate: 2020-04-03
  • Pressure-Assisted Sinter-Bonding Characteristics at 250 °C in Air Using
           Bimodal Ag-Coated Cu Particles
    • Abstract: To achieve bondlines with improved heat resistance and thermal conductance during operation, pressure-assisted sinter-bonding was performed in air with bimodal Ag-coated Cu particles for die attachment of the next-generation power devices composed of SiC. The bonding temperature and pressure were 250 °C and 10  MPa, respectively, and the sizes of the bimodal particles were 2 µm and 350 nm. After a short bonding time of 10 min, a paste with a 6:4 mixing ratio showed an average shear strength of > 20 MPa. The dewetting of Ag shells on the particles and void filling by the 350 nm particles induced rapid sintering. Graphic
      PubDate: 2020-04-02
  • Beneficial Effect of Manganese(II) Ions on the Morphology of Polyol
           Synthesised Silver Nanowires
    • Abstract: Silver nanowires (Ag NWs) is a potential material to be used as the transparent conductive electrode (TCE) material, in the flexible electronic applications. The polyol method is the commonly used technique to synthesis the silver nanowires. The growth of the silver nanowires is facilitated by the oxidative etching of the silver seed particles. The present work investigates the influence of the manganese(II) ions to promote the growth of silver nanowires. The manganese(II) ions, due to its multiple oxidation states, play an essential role in removing the dissolved atomic oxygen, which prevent the growth of longer nanowires. Its effect on the length and diameter of the silver nanowires is studied in detail with different concentration levels. Characterization tools, such as X-ray diffractometry, electron microscopy (FESEM and TEM) and UV–VIS spectroscopy are used to characterise the synthesised silver nanowires. The addition of manganese(II) ions alters the aspect ratio of the silver nanowires that in turn, affects the optoelectrical properties of the TCE films. By using the synthesised silver nanowires, transparent heaters are successfully fabricated and their performances under different conditions are evaluated. Graphic
      PubDate: 2020-04-02
  • Strain-Dependent Polar Optical Phonon Scattering and Drive Current
           Optimization in Nanoscale Monolayer MoS 2 FETs
    • Abstract: Recently, microelectromechanical system has been used to dynamically strain atomically thin materials including MoS2. While strain can significantly modulate the electronic and phonon structures of monolayer MoS2, its impact on electron transport, especially in the dissipative regime, has not been well explored. In this paper, using a three-dimensional particle-based quantum-corrected Monte Carlo device simulator, the effects of uniaxial and biaxial strain on room-temperature electron transport in a model monolayer molybdenum disulphide (MoS2) based field-effect transistor have been investigated. In the beginning, the simulator has been validated against recently published experimental results. Overall, strain in monolayer MoS2 strongly affects the polar optical phonon modes as well as the electronic bandstructure. Uniaxial strain breaks the degeneracy of E′ Raman mode and results in phonon softening. In this case, our results show that, for both E+ and E− Raman modes, ON current first increases for up to 3.7% of applied strain and then decreases as the strain is increased further. As for biaxial strain, we consider the effects of both tensile and compressive stresses. We find that the application of biaxial tensile strain boosts the ON current for up to 4% of strain. Especially, biaxial tensile strain leads to ~ 15.56% increase in the ON current, which is highest for any type of applied stress. Graphic
      PubDate: 2020-04-02
  • Homogeneity in the Microwave Surface Resistance of Large YBa 2 Cu 3 O
           7−δ Superconductor Films Coated with Au
    • Abstract: We studied homogeneity in the microwave surface resistance of Au-coated YBa2Cu3O7−δ (Au/YBCO) films. The Au/YBCO film with 4-inches in diameter was prepared in-situ with the thicknesses of 68 nm and 365 nm for the Au layer and the YBa2Cu3O7−δ (YBCO) layer, respectively. We measured the effective surface resistance (RS,eff) of the Au/YBCO film at temperatures of 25 K, 60 K, 70 K, and 77 K, respectively, at 29 different positions on the film. The RS,eff values were analyzed with the finite thicknesses of the Au and the YBCO layers taken into consideration. The local RS,eff values of the Au/YBCO film appeared to be almost uniform at 25 K. Meanwhile significant positional dependences were observed for the RS,eff of the Au/YBCO film at 60 K, 70 K and 77 K, respectively, which seemed to be due to non-uniform local penetration depth (λ) of the YBCO layer rather than due to variations in the local real-part conductivity of the YBCO layer. The observed results could not be attributed to the properties of the Au layer. At temperatures below the critical temperature of YBCO, the observed RS,eff values of the Au/YBCO film were significantly lower than those estimated using the surface resistance of Au and YBCO, which reflected proximity effects of the normal-metal Au layer in contact with the superconducting YBCO layer. Homogeneity in the RS,eff of the Au/YBCO film might be correlated with the distributions in the local λ of the YBCO layer, providing valuable information needed for designing microwave filters. Graphic
      PubDate: 2020-04-02
  • Effect of Cr Doping on Structural, Optical and Dielectric Properties of
           ZnO Nanoceramics Synthesized by Mechanical Alloying
    • Abstract: The region. Graphic
      PubDate: 2020-03-02
  • Coral-Like NiFe 2 O 4 /C Composite as the High-Performance Anode Material
           for Lithium-Ion Batteries
    • Abstract: In this work, we fabricated NiFe2O4/C composite with a coral-like structure through co-precipitation approach followed by thermal decomposition. The composite with a large surface area of 162.1 m2 g−1 and an average pore size of 11.8 nm was obtained. The porous structure in the composite derived from oxalate can effectively accommodate the volume changes of NiFe2O4 during the cycling processes. When used as anode materials, the initial charge and discharge capacities of the composite were 926.7 and 1277.7 mAh g−1 at 100 mA g−1. After 50 cycles, the reversible capacity of NiFe2O4/C could still remain at 892.4 mAh g−1. Even at a current density of 2000 mA g−1, the reversible capacity still reached 523.3 mAh g−1. The results showed that the synergy between NiFe2O4 and carbon improved the electrochemical performance, and the porous composite could stabilize the structure of the electrode. Graphic
      PubDate: 2020-03-02
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