Chemiresistive SO2 sensor: graphene oxide (GO) anchored poly(3,4-ethylenedioxythiophene):poly(4styrenesulfonate) (PEDOT:PSS)

This report deals with the synthesis of poly(3,4-ethylenedioxythiophene):poly(4styrenesulfonate)/graphene oxide (PEDOT:PSS/GO) composites by solution processing method and exploration of the same for chemiresistive-type SO2 gas sensing. The PEDOT:PSS polymer is used as a conducting layer due to high stability in air and GO due to the high surface-to-volume ratio. The PEDOT:PSS/GO was characterized by using an X-ray diffractometer, atomic force microscopy (AFM), and Raman spectroscopy. The sensor channel was fabricated by drop-casting PEDOT:PSS/GO on the sub-mm gap of copper a electrode on plastic substrate, which forms two-electrode devices as a sensor. The PEDOT:PSS/GO sensor platform manifests highly selective, sensitive, rapid, and reversible responses for the detection of 0.5-40 ppm SO2 gas. Moreover, it exhibits fast response and recovery time (81 s and 92 s), with excellent selectivity and stability at room temperature.