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Abstract:
he development of high-performance hydro-gen sensors is considered of great significance for the safety of hydrogen energy and related industries. The two-dimensional(2D) MoS(2)nanomaterials have exhibited great superiority inbuilding fast and reliable room-temperature hydrogen sensors. However, their poor sensitivity and selectivity issues still limit their wide exploitation. In this work, nano-SnO2-mod-ified MoS(2)thin films with structure-dependent n-p tunable hydrogen response behaviours were reported. Thein-situscanning Kelvin probe microscopy (SKPM) study on the hy-drogen response of the SnO2/MoS(2)systems revealed the dif-ferent reductions in the surface potential of SnO2(0.38 eV)and MoS2(0.26 eV) in a hydrogen environment, which resultsin different variations in the interface potential barrier withthe increasing surface coverage of SnO2. As a result, the con-tribution from the interface effect to the n-type hydrogen re-sponse was changed from the positive enhancement to thenegative compensation. The sensor exhibited a fast, enhanced,and selective n-type hydrogen response with the SnO(2)coveragedown to 6.4%, while a p-type sensor response was achievedwhen the SnO(2)coverage increased to 95.6%. Such structure-dependent n-p tunable hydrogen sensing behaviour can notonly be utilized for the sensitization of the sensing layers butmay also provide a simple and cost-effective way for themodulation of the response type of the sensor composed of theMoS(2)-based 2D materials.
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Source :
SCIENCE CHINA-MATERIALS
ISSN: 2095-8226
Year: 2023
Issue: 11
Volume: 66
Page: 4427-4436
8 . 1 0 0
JCR@2022
Cited Count:
SCOPUS Cited Count: 4
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 0
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