Characterization of Multi-Walled Carbon Nanotube Film Sensor and Ethanol Gas-Sensing Properties

Dongzhi Zhang (China University of Petroleum (East China))
Kai Wang (China University of Petroleum (East China))
Bokai Xia (China University of Petroleum (East China))

TELKOMNIKA (Telecommunication Computing Electronics and Control)
Vol 11, No 1: March 2013

Multi-wall carbon nanotubes (MWNTs) film-based sensor on the substrate of printed circuit board (PCB) with inter digital electrodes (IDE) were fabricated using layer-by-layer self-assembly, and the electrical properties of MWNTs film sensor were investigated through establishing models involved with number of self-assembled layers and IDE finger gap, and also its ethanol gas-sensing properties with varying gas concentration are characterized at room temperature. Through comparing with the thermal evaporation method, the experiment results shown that the layer-by-layer self-assembled MWNTs film sensor have a faster response and more sensitive resistance change when exposed to ethanol gas, indicated a prospective application for ethanol gas detection with high performance and low-cost.