Preparation and Gas-Sensing Properties of Two-Dimensional Molybdenum Disulfide/One-Dimensional Copper Phthalocyanine Heterojunction

Guoqing Chen; Xiaojie Xu; Hao Wang; Talgar Shaymurat

doi:10.3390/s23239321

Preparation and Gas-Sensing Properties of Two-Dimensional Molybdenum Disulfide/One-Dimensional Copper Phthalocyanine Heterojunction

Sensors (Basel). 2023 Nov 22;23(23):9321. doi: 10.3390/s23239321.

Authors

Guoqing Chen¹, Xiaojie Xu¹, Hao Wang¹, Talgar Shaymurat¹

Affiliation

¹ Key Laboratory of New Energy and Materials Research, Xinjiang Institute of Engineering, Urumqi 830023, China.

Abstract

Although 2D MoS₂ alone shows excellent gas-sensing performance, it is prone to stacking when used as the sensitive layer, resulting in insufficient contact with the target gas and lower sensitivity. To solve this, a 2D-MoS₂/1D-CuPc heterojunction was prepared with different weight ratios of MoS₂ nanosheets to CuPc micro-nanowires, and its room-temperature gas-sensing properties were studied. The response of the 2D-MoS₂/1D-CuPc heterojunction to a target gas was related to the weight ratio of MoS₂ to CuPc. When the weight ratio of MoS₂ to CuPc was 20:7 (7-CM), the gas sensitivity of MoS₂/CuPc composites was the best. Compared with the pure MoS₂ sensor, the responses of 7-CM to 1000 ppm formaldehyde (CH₂O), acetone (C₃H₆O), ethanol (C₂H₆O), and 98% RH increased by 122.7, 734.6, 1639.8, and 440.5, respectively. The response of the heterojunction toward C₂H₆O was twice that of C₃H₆O and 13 times that of CH₂O. In addition, the response time of all sensors was less than 60 s, and the recovery time was less than 10 s. These results provide an experimental reference for the development of high-performance MoS₂-based gas sensors.

Keywords: CuPc; MoS2; VOC; ethanol; gas sensor; heterojunction.

Grants and funding

This research was funded by the National Natural Science Foundation of China (grant number 62061046), the Natural Science Foundation of Xinjiang Uygur Autonomous Region (grant number 2023D01A81), and the Third “Tianshan Talents” Training Project of Xinjiang Uygur Autonomous Region.