tThe resistance-based sensors of polyaniline/titania (rutile) nanocomposite (TPNC) were prepared by spincoating technique onto an epoxy glass substrate with Cu-interdigited electrodes to study their hydrogen(H2) gas sensing features. Our findings are that the change of the surface morphology, porosity and wt% oftitania in TPNCs have a significant effect on H2gas sensing of sensors. All of the sensors had a reproducibil-ity response toward 0.8 vol% H2gas at room temperature, air pressure and 50% relative humidity. A sensorwith 40 wt% of titania nanoparticles had better response/recovery time and the response than other sen-sors. Moreover, H2gas sensing mechanism of TPNC sensors based contact areas and the correlation ofenergy levels between PANI chains and the titania grains were studied.
