Nanomaterial based room temperature Hydrogen gas sensors

Polyaniline (PANI) nanofiber and PANI/semi-conducting metal oxide nanofiber composites based layered surface acoustic wave (SAW) and conductometric sensors have been developed and investigated towards hydrogen (H<sub>2</sub>) gas. Chemical oxidative polymerization of aniline was employed to synthesize pure PANI nanofibers as well as PANI/semi-conducting metal oxide composites. The nano-materials were deposited onto layered ZnO/64deg YX LiNbO<sub>3</sub> SAW and conductometric transducers. The novel sensors were exposed to H<sub>2</sub> gas. Fast response and recovery with good repeatability were observed at room temperature