Hydrogen gas sensor based on highly ordered polyaniline nanofibers

Presented is the structural and gas sensing properties of polyaniline nanofibers deposited on 36° lithium tantalate (LiTaO3) surface acoustic wave (SAW) transducers. The polyaniline nanofibers were synthesized using electropolymerization and subsequently dedoping technique. Field emission scanning electron microscopy (FE-SEM) revealed that the diameter of the polyaniline nanofibers is in the range of 40-50 nm. The SAW sensors with different thicknesses of thin film made of polyaniline nanofibers were then exposed to different concentrations of hydrogen (H2) gas at room temperature.