作者
Xu Tian,Shan‐Li Wang,Bo Yao,Zhezhe Wang,Ting Chen,Xuechun Xiao,Yude Wang
摘要
Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) is a promising NH3 sensing material owing to its super high electrical conductivity, excellent environmental stability, and reversible doping/dedoping nature. However, the low sensitivity and sluggish recovery rate limit its further application in gas sensors. Herein, exfoliated layered MoS2 nanosheets with large-specific surface area and abundant edge sulfur (S) vacancies are utilized to assist PEDOT:PSS and achieve ideal improvement in NH3 sensing performance at room temperature (RT), including high response values, fast response/recovery ability, and excellent sensing stability in complex environment. MoS2 nanosheets are combined with PEDOT:PSS to construct p-n heterojunction, the S vacancies can improve carrier transfer rate and serve as conductive bridge, effective active sites for NH3 adsorption, this series of performance improvement strategies is the significance of this work. Meanwhile, the density-functional theory (DFT), current-voltage (I-V), and in-situ FITR are firstly employed to discuss the sensing mechanisms in detail. Furthermore, integrating MoS2/PEDOT:PSS flexible sensor into a designed printed circuit board to intelligent, visual, and wireless real-time monitoring the NH3 resistance information in a simulated greenhouse vegetables equipment through the smartphone APP has also been successfully implemented. The preparation and applications of poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) and MoS2 nanosheets are environmentally friendly. NH3 gas is a harmful air pollutant gas. Even at low concentrations, it will cause serious harm to human health by damaging the throat, lungs, eyes, and skin. Therefore, developing a new NH3 gas sensing materials with high response and selectivity and room-operating temperature detection capability for monitoring the living/working environment makes a lot of sense.