Flexible Synergistic MoS<sub>2</sub> Quantum Dots/PEDOT: PSS Film Sensor for Acetaldehyde Sensing at Room Temperature
Ling Jin, Kai Yang, Lifan Chen, Ruran Yan, Lifang He, Mingfu Ye, Hongbin Qiao, Xiangfeng Chu, Hong Gao, Kui Zhang
Abstract
Acetaldehyde (CH 3 CHO) is known as a primary carcinogen, and the development of wearable gas sensors for its detection at room temperature has rarely been rarely reported. Herein, MoS 2 quantum dots (MoS 2 QDs) have been employed to dope with poly(3,4-ethylenedioxythiophene): polystyrenesulfonate (PEDOT: PSS) via a simple in situ polymerization technique, and the CH 3 CHO gas-sensing properties of the resultant flexible and transparent film were investigated. MoS 2 QDs had been evenly dispersed into the polymer, and it was shown that PEDOT: PSS doped with the 20 wt % MoS 2 QDs sensor exhibited the highest response value of 78.8% against 100 ppm CH 3 CHO and its detection limit reached 1 ppm. Moreover, the sensor response remained stable for more than 3 months. In particular, the different bending angles (from 60 to 240°) had little effect on the sensor response to CH 3 CHO. The possible reason for the enhanced sensing properties was attributed to the large number of reaction sites on the MoS 2 QDs and the direct charge transfer between the MoS 2 QDs and PEDOT: PSS. This work suggested a platform to inspire MoS 2 QDs-doping PEDOT: PSS materials as wearable gas sensors for highly sensitive chemoresistive sensors to detect CH 3 CHO at room temperature.