Optimization analysis to improve sensing performance of PANI-TiO₂ composite on acetone detection at lower operating temperature

The performance of titanium oxide (TiO₂) gas sensing usually occurs at higher temperatures, but the sensing activity has some limitations. This study brings the combination of polyaniline with titanium dioxide as sensing materials to enhance the sensing performance while maintaining the structure of the materials. The PANI was doped with TiO₂ using in situ chemical polymerization with various loading compositions. The surface and porous morphology were analyzed using Field Emission Scanning Electron Microscopy and Brunauer-Emmet-Teller. The one factor at one time was applied and optimization using the response surface method (RSM). The optimization study found that the 30 wt% of PANI on TiO₂ gives significant sensitivity at a temperature of 45 °C. The findings show that acetone can be detected at lower operating temperatures and prolong the lifetime of the gas sensor.