Abstract
A kinetic theory combined with an effective medium theory in a nonlinear basis is used to compute the effective dielectric of single-walled carbon nanotubes (SWNTs) in the presence of gas molecules. The effect of the change of SWNT volume fraction on the response to gas molecules is investigated to find the optimum SWNTs embedded in the system. The computational results obtained show that the effective dielectric of the system increases explicitly with increasing dielectric and volume fraction of SWNTs. The effects of molecular adsorption on the effective dielectric of the system are also examined. This investigation showed that the effective dielectric of the system increases with increasing collision frequency and decreases with increasing electron density. This work is helpful for designing SWNT gas sensors.
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