CVD grown, few walled carbon nanotubes (FWCNTs) were quasi decorated with SnO2nanoparticles (FWCNTs-SnO2) and its gas sensing properties were analyzed with ammonia and ethanol. At room temperature FWCNTs-SnO2 show enhanced 'p type' gas sensing response than FWCNTs. Activation of SnO2 at high temperatures led to systematic changes in the sensing behavior towards 'n type' response. Temperature dependent transport behavior was found to be a one dimensional variable range hopping mechanism (1D-VRH) for the FWCNTs and a 3D-VRH mechanism for the FWCNTs-SnO2. These temperature dependent gas transport and sensing properties elucidate the hybrid nature of the nanocomposite with novel characteristics. This also implies its importance as a potential gas sensor material.
- Few-walled carbon nanotubes
- Gas sensor