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Amorphous FeSnO Nanosheets with Hierarchical Vacancies for Room-Temperature Sodium-Sulfur Batteries.
Angew Chem Int Ed Engl
September 2024
State Key Laboratory of Molecular Engineering of Polymers, Department of Materials Science, Fudan University, Shanghai, 200438, P. R. China.
Room-temperature sodium-sulfur (RT Na-S) batteries, noted for their low material costs and high energy density, are emerging as a promising alternative to lithium-ion batteries (LIBs) in various applications including power grids and standalone renewable energy systems. These batteries are commonly assembled with glass fiber membranes, which face significant challenges like the dissolution of polysulfides, sluggish sulfur conversion kinetics, and the growth of Na dendrites. Here, we develop an amorphous two-dimensional (2D) iron tin oxide (A-FeSnO) nanosheet with hierarchical vacancies, including abundant oxygen vacancies (Os) and nano-sized perforations, that can be assembled into a multifunctional layer overlaying commercial separators for RT Na-S batteries.
View Article and Find Full Text PDFNanomechanoelectrical approach to highly sensitive and specific label-free DNA detection.
Proc Natl Acad Sci U S A
August 2023
Department of Mechanical and Industrial Engineering, University of Massachusetts Amherst, Amherst, MA 01003.
Electronic detection of DNA oligomers offers the promise of rapid, miniaturized DNA analysis across various biotechnological applications. However, known all-electrical methods, which solely rely on measuring electrical signals in transducers during probe-target DNA hybridization, are prone to nonspecific electrostatic and electrochemical interactions, subsequently limiting their specificity and detection limit. Here, we demonstrate a nanomechanoelectrical approach that delivers ultra-robust specificity and a 100-fold improvement in detection limit.
View Article and Find Full Text PDF3D-Printed Ultra-Robust Surface-Doped Porous Silicone Sensors for Wearable Biomonitoring.
ACS Nano
February 2020
Multi-Scale Additive Manufacturing Lab, Mechanical and Mechatronics Engineering Department , University of Waterloo , 200 University Avenue West, Waterloo , Ontario N2L 3G1 , Canada.
Three-dimensional flexible porous conductors have significantly advanced wearable sensors and stretchable devices because of their specific high surface area. Dip coating of porous polymers with graphene is a facile, low cost, and scalable approach to integrate conductive layers with the flexible polymer substrate platforms; however, the products often suffer from nanoparticle delamination and overtime decay. Here, a fabrication scheme based on accessible methods and safe materials is introduced to surface-dope porous silicone sensors with graphene nanoplatelets.
View Article and Find Full Text PDFUltra-Robust Deep-UV Photovoltaic Detector Based on Graphene/(AlGa)O/GaN with High-Performance in Temperature Fluctuations.
ACS Appl Mater Interfaces
December 2019
State Key Laboratory of Optoelectronic Materials and Technologies, School of Materials , Sun Yat-sen University, Guangzhou , Guangdong 510275 , China.
A strategy of adopting GaO alloyed with Al element to reduce the oxygen vacancy defect density and enhance the interface barrier height of GaO heterojunction is proposed to fabricate deep-UV photovoltaic detectors with high thermal stability, high photoresponsivity, and fast response speed. Here, a graphene/(AlGa)O/GaN device with a photoresponsivity of ∼20 mA/W, a rise time of ∼2 μs, and a decay time of ∼10 ms is presented at 0 V bias. At the working temperature of 453 K, the device still exhibits a photo-to-dark current ratio (PDCR) of ∼1.
View Article and Find Full Text PDFTin Disulfide Nanosheets with Active-Site-Enriched Surface Interfacially Bonded on Reduced Graphene Oxide Sheets as Ultra-Robust Anode for Lithium and Sodium Storage.
ACS Appl Mater Interfaces
August 2018
Beijing Municipal Key Laboratory of New Energy Materials and Technologies , Beijing 100083 , China.
Two-dimensional (2D) tin disulfide (SnS) has attracted intensive research owing to its high specific capacity for Li and Na storage, natural abundance, as well as environmental friendliness. However, the poor reaction kinetics, low intrinsic electrical conductivity, and severe volumetric variation upon cycling processes of SnS impede its widespread application. In this work, SnS nanosheets with active-site-enriched surface intimately grown on reduced graphene oxide (rGO) via C-O-Sn chemical bonds are prepared.
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