Carbon Mono-Oxide Gas Sensing Based on Multi-Walled Carbon Nanotubes Decorated with Gold Nanoparticles Based Film Sensors

摘要

In the present communication, we report the CO gas sensing studies on sensing film containing carbon nanotubes (CNTs) decorated with gold nanoparticles. This sample is also annealed at 200 ℃ for one hour and the effect of annealing on CO gas sensing properties is also studied. From the FESEM images, it is observed that the diameter of the as-grown multi-walled nanotubes ranges from 10-30 nm. The electrode pattern has been thermally evaporated to get a typical pattern of a MWNTs film sensor. Typical response of this sensor has been studied for sensing the different concentration of carbon mono-oxide gas. It is observed that both the response and recovery of MWNTs decorated with gold nanoparticles film sensor to CO gas is found to be fast. The resistance of both the MWNTs-based film sensors shows an increasing trend with the increase in gas concentration. The responsiveness and the sensitivity of the sensing films do decrease with the increase in the concentration of CO gas.