Skip to Main Content
In this paper, the poly-2,5-dimethoxyethynylbenzene (PDMEB) and poly-2,5-dimethoxyethynylbenzene/In2O3 were in-situ synthesized as gas sensing materials. The PDMEB/In2O3 nanocomposite was accessed by two procedures both relying on Pd catalysis: (1) The reaction of ethynyltri-n-buyltin replacing Br belonged to 1,4-dibromo-2,5-dimethoxy benzene, and (2) The step-growth polymerization of PDMEB through heating up the mixer, at the same time adding appropriate In2O3 nanoparticle. The morphology of films were characterized by scanning electron microscope(SEM). Compared with the pure PDMEB, it clearly appears that In2O3 components influence the morphology of the nanocomposite film, which leads to the variation of the response-recovery behavior of sensors. The PDMEB and PDMEB/In2O3 were deposited on the surface acoustic wave devices (SAW, whose corresponding operation frequency of baseline is 433.9MHz) to fabricate gas sensors by the spin-coating method. The sensors were exposed to various concentrations of CH4 (in the range of 1%-5%) at room temperature, and the frequency shift of sensors were recorded. It was found that the PDMEB/In2O3 nanocomposite thin film sensor exhibited a better gas-sensing property than that of PDMEB thin film sensor.