CHAPTER 24: Graphene-Based Gas Sensors

Graphene, a monolayer of graphite sheet consisting of sp²-hybridized carbon atoms covalently bonded to three other atoms, has recently attracted the attention of chemical sensor researchers owing to its unique structural, mechanical and electrical properties. The gas-sensing mechanism of graphene and its derivatives is based on the adsorption/desorption of gaseous molecules on the graphene surface, which leads to changes in its properties. Different device configurations from the most common chemiresistors and field effect transistors to others that measure the changes in surface work function or the frequency of the surface acoustic waves are used for the detection of contaminants in air. This chapter gives a brief review of the recent progress in the application of grapheme-based materials for gas sensing.