Flexible Synergistic MoS2 Quantum Dots/PEDOT: PSS Film Sensor for Acetaldehyde Sensing at Room Temperature

Acetaldehyde (CH3CHO) is known as a primarycarcinogen,and the development of wearable gas sensors for its detection at roomtemperature has rarely been rarely reported. Herein, MoS2 quantum dots (MoS2 QDs) have been employed to dope withpoly-(3,4-ethylene-dioxythiophene): polystyrene-sulfonate(PEDOT: PSS) via a simple in situ polymerization technique, and theCH(3)CHO gas-sensing properties of the resultant flexibleand transparent film were investigated. MoS2 QDs had beenevenly dispersed into the polymer, and it was shown that PEDOT: PSSdoped with the 20 wt % MoS2 QDs sensor exhibited the highestresponse value of 78.8% against 100 ppm CH3CHO and itsdetection limit reached 1 ppm. Moreover, the sensor response remainedstable for more than 3 months. In particular, the different bendingangles (from 60 to 240 degrees) had little effect on the sensor responseto CH3CHO. The possible reason for the enhanced sensingproperties was attributed to the large number of reaction sites onthe MoS2 QDs and the direct charge transfer between theMoS(2) QDs and PEDOT: PSS. This work suggested a platformto inspire MoS2 QDs-doping PEDOT: PSS materials as wearablegas sensors for highly sensitive chemoresistive sensors to detectCH(3)CHO at room temperature.