Carbon Nanotubes for Gas Sensing

Carbon nanotubes (CNTs) are one of the most exciting and challenging research domains in nanotechnology. CNTs present a large surface area, excellent electron transfer, and the ability to be combined with various materials without losing their graphitic structure. Due to these properties, CNTs are considered very promising for application in the gas sensing field. Although the nanotubes can be applied directly as sensors, combining different materials (e.g., metal, oxides, polymers) might improve the sensors’ sensitivity and selectivity toward specific gases. This chapter presents an overview of the production and application of gas sensing devices based on CNTs. The use of single-wall CNTs (SWCNTs) and multi-wall CNTs (MWCNTs) over the years to fabricate such devices are described in detail.