Abstract
In this paper, we report on the electrical transport characteristics and sensitivity to chemical exposure of single wall carbon nanotube devices fabricated on Pd, plasma-oxidized Pd, and Au electrodes. When the devices are exposed to vapors from ammonia, ethanol, and water, the response of current to each chemical is unique. However, there is essentially no difference in response between devices with different electrode materials. This finding suggests that for the chemical species tested in this study, the main interaction is on the nanotube or nanotube junction, and not on the effect stemming from electrode adsorption and the change in electrode work function.
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