Hydrogen Gas Sensors Based on Graphene/Polyaniline Nanocomposite

Graphene/polyaniline nanocomposite has been developed through two template-free synthetic routes. Scanning Electron Microscopy (SEM) was used to characterize the resulting graphene/ polyaniline nanocomposites yielded from the two syntheses. The solutions from these reactions were airbrushed on the surfaces of conductometric transducers. A comparison between the gas sensing performances of the two developed sensors is presented. It was found that the sensitive film based on the graphene/polyaniline nanocomposite directly synthesized from graphene has a sensitivity of - 20% towards 1 % of hydrogen gas diluted in synthetic air. On the other hand the sensitive film based on the graphene/polyaniline nanocomposite synthesized from the reduction of graphene oxide/polyaniline has a sensitivity of only 4.43% towards the same concentration of hydrogen gas. All gas sensing measurements were conducted at room temperature. The developed sensors are promising for industrial applications.