مشخصات پژوهش

Gas sensors play a significant role in environmental monitoring, industrial safety, medical diagnosis, and aerospace. Nanotechnology provides opportunities to develop the next generation gas detectors with enhanced performance. The higher detection area of the nanomaterials leads to greater adsorption of gas species on them and increased sensing capability. Among nanostructured gas sensing systems, nano-carbon based materials proved to be promising due to their intrinsic electrical properties. Further, the high surface area, high chemical and thermal stability and functionalization capability make them suitable for high performance label free chemical sensing. Recently, graphene, a carbon allotrope has attracted a great deal of interest as sensing material due to its high specific surface area and unique electrical properties. The adsorption of gas molecules on graphene’s surface leads to changes in its electrical conductivity that can be attributed to the change in the local carrier concentration induced by the surface adsorbates which act as electron donors or acceptors. The graphene based sensor on SiO2/Si substrate for NH3 and O2 detection, Pd/Au electrode on graphene for sensing NO2, multilayer grapheme-palladium nanocomposite with Au electrode for H2 detection, Au contact based graphene sensor for NH3 and NO2 detection, and graphene with gold electrode to CO2 sensing were investigated. Therefore graphene provides a new insight for developing novel materials in gas sensor production