Three-Dimensional MoS2/Reduced Graphene Oxide Nanosheets/Graphene Quantum Dots Hybrids for High-Performance Room-Temperature NO2 Gas Sensors

Nanomaterials

Nantao Hu¹  Zhekun Wu²  Yanyan Wang²  Zhanbo Zhang²  Cheng Yang²  Changsi Peng² 

[1] 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, Shanghai 200240, China;School of Optoelectronic Science and Engineering & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China;

关键词: three-dimensional structure;    MoS₂;    reduced graphene oxide (rGO);    graphene quantum dots (GQDs);    gas sensor;   

DOI  :  10.3390/nano12060901

来源: DOAJ

【 摘 要 】

This study presents three-dimensional (3D) MoS₂/reduced graphene oxide (rGO)/graphene quantum dots (GQDs) hybrids with improved gas sensing performance for NO₂ sensors. GQDs were introduced to prevent the agglomeration of nanosheets during mixing of rGO and MoS₂. The resultant MoS₂/rGO/GQDs hybrids exhibit a well-defined 3D nanostructure, with a firm connection among components. The prepared MoS₂/rGO/GQDs-based sensor exhibits a response of 23.2% toward 50 ppm NO₂ at room temperature. Furthermore, when exposed to NO₂ gas with a concentration as low as 5 ppm, the prepared sensor retains a response of 15.2%. Compared with the MoS₂/rGO nanocomposites, the addition of GQDs improves the sensitivity to 21.1% and 23.2% when the sensor is exposed to 30 and 50 ppm NO₂ gas, respectively. Additionally, the MoS₂/rGO/GQDs-based sensor exhibits outstanding repeatability and gas selectivity. When exposed to certain typical interference gases, the MoS₂/rGO/GQDs-based sensor has over 10 times higher sensitivity toward NO₂ than the other gases. This study indicates that MoS₂/rGO/GQDs hybrids are potential candidates for the development of NO₂ sensors with excellent gas sensitivity.

【 授权许可】

Unknown