Development of gas sensor system based on the TiO2/Pani composite thin film

Development of organic and inorganic composites has grown in recent years due to a wide range of potential use of these materials. The aim of this research is to investigate the effect of Pani additions on the TiO₂ based thin film as VOC gas sensing properties. TiO₂ were prepared using sol gel technique. Up to 3 wt% of Pani were directly added to the TiO₂ solution. 3 layers of TiO₂/Pani solution mixture were deposited onto SiO₂ coated silicon substrate using spin coating technique for fabrications of gas sensing device. The microstructures properties of samples were investigated using XRD, TEM and SEM. In addition, all samples were exposed to ethanol for gas sensing performance test. The gas sensing test revealed that all films were responsive towards ethanol vapour exposure with 2 wt% TiO₂/Pani film exhibited the best sensitivity. However, over longer exposure cycles, it was observed that 3 wt% TiO₂/Pani film have a better stability.