Multiwall carbon nanotubes grown on a four-probe patterned catalyst layer for chemical sensor applications

The fabrication and the application of aligned multi-wall carbon nanotubes (MWNTs) grown on a four-probe patterned catalyst layer for the detection of chemical vapors are reported. The temperature resistance results show that the aligned MWNTs are semiconducting and follow the 3-dimensional hopping conduction mechanism. Effects of oxygen plasma on the characteristics of the MWNTs are also investigated. The four-probe MWNTs devices show resistance changes with exposure to gas vapors and that correlate with solvent polarity parameters. Those results suggest that our four-probe MWNTs devices are promising for chemical sensor applications.