PSSA Doped Polyaniline Nanofiber Based ZnO/64/spl deg/ YX LiNbO/sub 3/ SAW H/sub 2/ Gas Sensor

A polyaniline (PANI) nanofiber based surface acoustic wave (SAW) gas sensor, has been developed and investigated towards hydrogen (H
₂
) gas. A template-free, rapidly-mixed reaction approach was employed to synthesize polyaniline nanofibers, which utilized chemical oxidative polymerization of aniline. Hydrochloric acid (HCl) was used as the dopant acid in the synthesis of the polyaniline nanofibers. Polystyrene sulfonic acid (PSSA) was used to re-dope PANI nanofibers after dialyzing with ammonium hydroxide. Then PSSA doped nanofibers were deposited onto a ZnO/64 YX LiNbO
₃
SAW transducer. The sensor was exposed to various concentrations of H
₂
gas in an ambient of synthetic air, and operated at room temperature.