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Nano-Micro Letters
Journal Prestige (SJR): 1.554  Citation Impact (citeScore): 6 Number of Followers: 1  Open Access journalISSN (Print) 2311-6706 - ISSN (Online) 2150-5551 Published by SpringerOpen  [228 journals]
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- Anti-Overturning Fully Symmetrical Triboelectric Nanogenerator Based on an
Elliptic Cylindrical Structure for All-Weather Blue Energy Harvesting
Abstract: Highlights The novel elliptical cylindrical structure (EC) provided an excellent self-stability, high sensitivity in small agitations, and most importantly, a distinctive anti-overturning capability for the EC-triboelectric nanogenerator (EC-TENG). Benefitting from the fully symmetrical design, the EC-TENG could maintain the original output after being overturned under extreme conditions, distinguishing itself from previous TENGs. Two built-in TENGs designed for use in rough seas and tranquil seas improved the collection efficiency for all-weather wave energy.
PubDate: 2022-05-11
- Digital Light Processing 3D-Printed Ceramic Metamaterials for
Electromagnetic Wave Absorption
Abstract: Combining 3D printing with precursor-derived ceramic for fabricating electromagnetic (EM) wave-absorbing metamaterials has attracted great attention. This study presents a novel ultraviolet-curable polysiloxane precursor for digital light processing (DLP) 3D printing to fabricate ceramic parts with complex geometry, no cracks and linear shrinkage. Guiding with the principles of impedance matching, attenuation, and effective-medium theory, we design a cross-helix-array metamaterial model based on the complex permittivity constant of precursor-derived ceramics. The corresponding ceramic metamaterials can be successfully prepared by DLP printing and subsequent pyrolysis process, achieving a low reflection coefficient and a wide effective absorption bandwidth in the X-band even under high temperature. This is a general method that can be extended to other bands, which can be realized by merely adjusting the unit structure of metamaterials. This strategy provides a novel and effective avenue to achieve “target-design-fabricating” ceramic metamaterials, and it exposes the downstream applications of highly efficient and broad EM wave-absorbing materials and structures with great potential applications.
PubDate: 2022-05-05
- Emerging Strategies in Enhancing Singlet Oxygen Generation of
Nano-Photosensitizers Toward Advanced Phototherapy
Abstract: Highlights Recent advancement in Type II nano-photosensitizers (AIE nanodots, carbon dots and metal nanoclusters) are reviewed. Nanoplasmonic strategies in enhancing singlet oxygen generation efficiency of different metal-photosensitizer (planar and colloidal) systems are discussed. Current challenges and future prospects of metal-enhanced nano-photosensitizers for advanced photodynamic therapy and theranostic treatment are highlighted.
PubDate: 2022-05-05
- Operando Converting BiOCl into Bi2O2(CO3)xCly for Efficient
Electrocatalytic Reduction of Carbon Dioxide to Formate
Abstract: Highlights An operando synthetic approach was exemplified to enhance catalyst stability for efficient reduction of CO2 to formate. A highly stable Bi2O2(CO3)xCly electrocatalyst was synthesized by direct electrochemical conversion of BiOCl via a cathodic potential-promoted anion-exchange process under operando CO2RR conditions. The surface Cl− in Bi2O2(CO3)xCly changes the p-orbital electron states to enhance the stability and alters the CO2RR pathway to markedly reduce the energy barrier.
PubDate: 2022-05-03
- Interface Engineering of NixSy@MnOxHy Nanorods to Efficiently Enhance
Overall-Water-Splitting Activity and Stability
Abstract: Highlights Three-dimensional (3D) core‐shell heterostructured NixSy@MnOxHy nanorods grown on nickel foam (NixSy@MnOxHy/NF) were successfully fabricated via a simple hydrothermal reaction and a subsequent electrodeposition process. The fabricated NixSy@MnOxHy/NF shows outstanding bifunctional activity and stability for hydrogen evolution reaction and oxygen evolution reaction, as well as overall‐water‐splitting performance. The main origins are the interface engineering of NixSy@MnOxHy, the shell‐protection characteristic of MnOxHy, and the 3D open nanorod structure, which remarkably endow the electrocatalyst with high activity and stability. Exploring highly active and stable transition metal-based bifunctional electrocatalysts has recently attracted extensive research interests for achieving high inherent activity, abundant exposed active sites, rapid mass transfer, and strong structure stability for overall water splitting. Herein, an interface engineering coupled with shell-protection strategy was applied to construct three-dimensional (3D) core‐shell NixSy@MnOxHy heterostructure nanorods grown on nickel foam (NixSy@MnOxHy/NF) as a bifunctional electrocatalyst. NixSy@MnOxHy/NF was synthesized via a facile hydrothermal reaction followed by an electrodeposition process. The X-ray absorption fine structure spectra reveal that abundant Mn‐S bonds connect the heterostructure interfaces of NixSy@MnOxHy, leading to a strong electronic interaction, which improves the intrinsic activities of hydrogen evolution reaction and oxygen evolution reaction (OER). Besides, as an efficient protective shell, the MnOxHy dramatically inhibits the electrochemical corrosion of the electrocatalyst at high current densities, which remarkably enhances the stability at high potentials. Furthermore, the 3D nanorod structure not only exposes enriched active sites, but also accelerates the electrolyte diffusion and bubble desorption. Therefore, NixSy@MnOxHy/NF exhibits exceptional bifunctional activity and stability for overall water splitting, with low overpotentials of 326 and 356 mV for OER at 100 and 500 mA cm–2, respectively, along with high stability of 150 h at 100 mA cm–2. Furthermore, for overall water splitting, it presents a low cell voltage of 1.529 V at 10 mA cm–2, accompanied by excellent stability at 100 mA cm–2 for 100 h. This work sheds a light on exploring highly active and stable bifunctional electrocatalysts by the interface engineering coupled with shell-protection strategy.
PubDate: 2022-05-03
- Bioinspired MXene-Based User-Interactive Electronic Skin for Digital and
Visual Dual-Channel Sensing
Abstract: Highlights A bioinspired MXene-based user-interactive electronic skin (e-skin) for digital and visual dual-signal sensing was designed and fabricated. The MXene-based e-skin exhibited an excellent electromechanical sensing performance and realized the real-time monitoring of human activities, such as handwriting, drinking, walking, and speaking. Benefiting from the outstanding Joule-heating performance of MXene-based film, the e-skin with thermochromic pigments could realize a wider range and dynamic coloration for passive displays and visual recognition of various human motions.
PubDate: 2022-05-03
- Vertically Aligned Silicon Carbide Nanowires/Boron Nitride Cellulose
Aerogel Networks Enhanced Thermal Conductivity and Electromagnetic
Absorbing of Epoxy Composites
Abstract: Highlights Cellulose aerogel with vertically oriented structure was obtained by constructing a vertically aligned SiC nanowires/BN network via the ice template assisted strategy. The thermal conductivity of the composite in the vertical direction reaches 2.21 W m−1 K−1 at a low hybrid filler loading of 16.69 wt%, which was increased 890% compared to pure epoxy. The composite exhibits good electrically insulating with a volume electrical resistivity about 2.35×1011 Ω cm, and displays excellent electromagnetic wave absorption performance.
PubDate: 2022-04-30
- Recent Progress of Electrode Materials for Flexible Perovskite Solar Cells
Abstract: Highlights Convincing candidates of flexible transparent electrodes are discussed in detail from the views of fabrication, properties and device performance. The progresses of flexible opaque electrodes used in flexible perovskite solar cells are provided. The future directions and challenges in developing flexible electrodes are highlighted.
PubDate: 2022-04-30
- Correction to: Ni Flower/MXene-Melamine Foam Derived 3D
Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and
Infrared Stealth
PubDate: 2022-04-28
- Porous Microspheres Comprising CoSe2 Nanorods Coated with N-Doped
Graphitic C and Polydopamine-Derived C as Anodes for Long-Lived Na-Ion
Batteries
Abstract: Highlights One-dimensional CoSe2 nanorods supported on three-dimensional microspheres were prepared via spray pyrolysis. Nanorods were coated by N-doped graphitic C and polydopamine-derived C. The unique nanostructure exhibits exceptional cycling stability (5000 cycles at 2.0 A g−1).
PubDate: 2022-04-28
- Biodegradable, Super-Strong, and Conductive Cellulose Macrofibers for
Fabric-Based Triboelectric Nanogenerator
Abstract: Highlights The cellulosed-based macrofibers possess super-strong tensile strength of 449 MPa and excellent electrical conductivity of 5.32 S cm−1. The cellulosed-based macrofiber can be degraded within 108 h in the cellulase solution. The designed fabric-based triboelectric nanogenerator (TENG) shows a maximum output power of 352 μW, which can effectively drive commercial electronics. The designed fabric-based TENG as self-powered sensors can effectively monitor the human movement of walking, running, jumping, arm lifting, arm bending, and leg lifting.
PubDate: 2022-04-28
- A Therapeutic Sheep in Metastatic Wolf’s Clothing: Trojan Horse Approach
for Cancer Brain Metastases Treatment
Abstract: Highlights DOX-PLGA@CM employs the whole set of membrane molecules of a brain-homing metastatic breast cancer cell optimized through a natural selection process. Thus, the hetero and multivalent effects of these molecules greatly facilitate the nanoparticle crossing the blood-brain barrier. Attributed to the homotypic effect of the nanocarrier, DOX-PLGA@CM shows stronger anticancer efficacy than free DOX for its parenteral cells. DOX-PLGA@CM effectively reaches the metastatic tumor lesions in the brain, and slows down the progression of brain metastatic breast cancer.
PubDate: 2022-04-28
- Oxygen Evolution Reaction in Energy Conversion and Storage: Design
Strategies Under and Beyond the Energy Scaling Relationship
Abstract: Highlights Catalytic descriptors for oxygen evolution reaction under scaling relationship are comprehensively reviewed. New oxygen evolution paradigms and design strategies aiming to circumvent the adsorption energy scaling relationship are summarized. Challenges and perspectives for further improving oxygen evolution activity are discussed.
PubDate: 2022-04-28
- Super-Tough and Environmentally Stable Aramid. Nanofiber@MXene Coaxial
Abstract: Highlights Super-tough and ultra-strong ANF@MXene fibers are wet-spun by a coaxial technique. High toughness of ~ 48.1 MJ m−3 and strength of ~ 502.9 MPa are achieved. The fibers exhibit superb chemical stability under extreme environmental conditions.
PubDate: 2022-04-24
- Cyclohexanedodecol-Assisted Interfacial Engineering for Robust and
High-Performance Zinc Metal Anode
Abstract: Highlights Cyclohexanedodecol (CHD) could facilitate the Zn dendrite-free plating/stripping at a nanoscale. The CHD molecules could effectively modify the hydrated Zn(H2O)62+ structure in aqueous Zn ion batteries. The addition of CHD could establish robust protection layers on the Zn electrode surface. The CHD-modified electrolytes exhibit long-term cycling stability.
PubDate: 2022-04-19
- Ultralight Magnetic and Dielectric Aerogels Achieved by Metal–Organic
Framework Initiated Gelation of Graphene Oxide for Enhanced Microwave
Absorption
Abstract: Highlights Metal–organic frameworks (MOFs) are used to directly initiate the gelation of graphene oxide (GO), producing MOF/rGO aerogels. The ultralight magnetic and dielectric aerogels show remarkable microwave absorption performance with ultralow filling contents. The development of a convenient methodology for synthesizing the hierarchically porous aerogels comprising metal–organic frameworks (MOFs) and graphene oxide (GO) building blocks that exhibit an ultralow density and uniformly distributed MOFs on GO sheets is important for various applications. Herein, we report a facile route for synthesizing MOF/reduced GO (rGO) aerogels based on the gelation of GO, which is directly initiated using MOF crystals. Free metal ions exposed on the surface of MIL-88A nanorods act as linkers that bind GO nanosheets to a three-dimensional porous network via metal–oxygen covalent or electrostatic interactions. The MOF/rGO-derived magnetic and dielectric aerogels Fe3O4@C/rGO and Ni-doped Fe3O4@C/rGO show notable microwave absorption (MA) performance, simultaneously achieving strong absorption and broad bandwidth at low thickness of 2.5 (− 58.1 dB and 6.48 GHz) and 2.8 mm (− 46.2 dB and 7.92 GHz) with ultralow filling contents of 0.7 and 0.6 wt%, respectively. The microwave attenuation ability of the prepared aerogels is further confirmed via a radar cross-sectional simulation, which is attributed to the synergistic effects of their hierarchically porous structures and heterointerface engineering. This work provides an effective pathway for fabricating hierarchically porous MOF/rGO hybrid aerogels and offers magnetic and dielectric aerogels for ultralight MA.
PubDate: 2022-04-19
- Surface Passivation and Energetic Modification Suppress Nonradiative
Recombination in Perovskite Solar Cells
Abstract: Highlights The partial substitution of Br− on I-sites, and the restricted motion of MA+ cations in correlation with suppressed electron-phonon coupling promote charge transport. The perovskite parent lattice of 2FEABr-treated perovskites was firmed, and the difficulty degree for A-site MA+ cations running out of the inorganic framework was thus enhanced. The efficiency was enhanced from 19.44% to 21.06%, accompanied with excellent stability.
PubDate: 2022-04-19
- Growth of Tellurium Nanobelts on h-BN for p-type Transistors with
Ultrahigh Hole Mobility
Abstract: Highlights The growth of high-quality single-crystalline Te nanobelts is reported by introducing atomically flat hexagonal boron nitride (h-BN) nanoflakes into the chemical vapor deposition system as the growth substrate. The field-effect transistor based on Te grown on h-BN exhibits an ultrahigh hole mobility up to 1370 cm2 V−1 s−1 at room temperature.
PubDate: 2022-04-19
- Enabling Multi-Chemisorption Sites on Carbon Nanofibers Cathodes by an
In-situ Exfoliation Strategy for High-Performance Zn–Ion Hybrid
Capacitors
Abstract: Highlights The high pyridine/pyrrole nitrogen-doped and carbonyl-functionalized nanosheets on flexible electrospun porous carbon nanofibers film cathode integrates the advantages of large specific surface area, strong hydrophilicity and high Zn2+ adsorption activity. The Zinc-ion hybrid capacitors exhibits a high capacitance retention of 99.2% over 200,000 cycles at 40 A g−1. A synergistic Zn2+ storage mechanism between carbonyl and pyridine/pyrrole nitrogen atoms is proposed.
PubDate: 2022-04-15
- Anti-Parkinsonian Therapy: Strategies for Crossing the Blood–Brain
Barrier and Nano-Biological Effects of Nanomaterials
Abstract: Highlights Strategies for crossing the blood–brain barrier and the nano-biological effects of nanomaterials used for anti-Parkinsonian therapy are summarized. Patents related to nanotechnology-based anti-Parkinsonian therapy are reviewed, and the status of progress in this field are discussed. Current challenges in nanotechnology-based Parkinson’s disease treatment are discussed, with insights into the future trends in this field.
PubDate: 2022-04-15
