Development of a gas pre-concentrator based on carbon nanotubes for benzene detection

We report the development of a gas preconcentrator based on carbon nanotubes for an efficient detection of benzene. The carbon nanotubes are spray coated on the preconcentrating support and their concentration factor is being determined. The results confirmed the adsorption of benzene in different tested CNT samples with different degrees of affinity. Among these materials, MWCNTs fabricated by Arc discharge method provided a sharp desorption peak at 250 °C with a practical concentration factor of 70.