首页|In-situ sulfidation-derived three-dimensional cobalt sulfide nanoflower/graphene nanosheet hybrid for ultrasensitive room-temperature NO2 gas sensor
In-situ sulfidation-derived three-dimensional cobalt sulfide nanoflower/graphene nanosheet hybrid for ultrasensitive room-temperature NO2 gas sensor
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NSTL
Elsevier
? 2022Two-dimensional (2D) nanosheets show great potential for gas sensing, but they can hinder the penetration of gas molecules and lead to deteriorated sensing performances. Hence, construction of 2D nanosheet-based gas sensing materials with unique structures is desirable for high-performance gas sensing. Herein, a three-dimensional (3D) binary nanosheet heterostructure based on 3D cobalt sulfide (CoS) nanoflower/graphene nanosheet hybrid was constructed for room-temperature NO2 gas sensing. The 3D CoS/reduced graphene oxide (rGO) hybrid derived from a mixture of Co3O4 nanoflowers and graphene oxide nanosheets was facilely formed via in-situ sulfidation and reduction processes. The resistance response of as-assembled gas sensor based on 3D CoS nanoflower/graphene nanosheet hybrid to 1 ppm NO2 was 39.7%, which was 4.2 and 3.1 times higher than that of CoS and rGO sensors, respectively. A response as high as 10.5% was achieved even when the device was exposed to NO2 gas with a low concentration of 50 ppb. Furthermore, the hybrid device exhibited linear response characteristic, high selectivity, good repeatability, as well as long-term stability. Overall, the proposed design strategy together with the as-constructed structures can pave the way for the development of high-performance gas sensors based on graphene hybrids.
CoS nanoflowersGas sensorIn-situ sulfidation methodReduced graphene oxideRoom temperature
Zhang Z.、Wang Y.、Ying S.、Yang C.、Peng C.、Zhao J.、Hu N.
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School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow University
College of Integrated Circuit Science and Engineering Nanjing University of Posts and Telecommunications
Key Laboratory of Thin Film and Microfabrication (Ministry of Education) Department of Micro/Nano Electronics School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University
NSTL
Elsevier
