Self‐Embedded Schottky Junctions in Liquid‐Metal‐Derived 2D Oxides for Fast and Selective Room‐Temperature H 2 Sensing
Source abstract
Abstract
Abstract Semiconductor‐based hydrogen sensors provide cost‐efficient solutions for safety and a circular hydrogen‐based economy. Liquid metal‐derived 2D metal oxides show promise as ultrathin sensing materials. However, conventional exfoliation inevitably introduces metallic resides, which are often removed post‐synthesis. Here the residual indium nano‐islands are strategically retained within annealed 2D ultrathin In 2 O 3 layers, creating self‐embedded Schottky junctions. This unique architecture enhances gas‐solid coupling at In/In 2 O 3 interfaces. Tuning the composition and spatial distribution of the indium nano‐islands amplifies the thermionic electron emission across the Schottky barriers. The resulting sensor achieves room‐temperature hydrogen detection with a rapid response time of 4.4 s, high sensor response of 3.4, and >2.5 selectivity against common interferents. Remarkably, it exhibits only a 6.7% performance deviation after 6 weeks and shows good humidity resistance. These merits underscore the potential of the material and method for addressing the formidable challenge in developing room‐temperature high‐performance hydrogen sensors.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Gas Sensing Nanomaterials and Sensors · Analytical Chemistry and Sensors · Transition Metal Oxide Nanomaterials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Hubei Key Laboratory of Micro/Nano‐electronic Materials and Devices Key Laboratory of Intelligent Sensing System and Security of the Ministry of Education School of Microelectronics Hubei University Wuhan 430062 P. R. China
Institute for Superconducting and Electronic Materials Australian Institute for Innovative Materials University of Wollongong Wollongong NSW NSW2500 Australia
School of Physics and Materials Science Jiangxi Key Laboratory for Two‐Dimensional Materials and Jiangxi Engineering Laboratory for Advanced Functional Thin Films Nanchang University Nanchang JX, 330031 P. R. China
School of Chemical Engineering University of New South Wales (UNSW) Kensington NSW 2052 Australia
School of Engineering and Research Center for Industries of the Future Westlake University Hangzhou 310030 P. R. China
Funding
Natural Science Foundation of Hubei Province · National Natural Science Foundation of China
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