Abstract
We studied physical and chemical adsorption on carbon nanotube surfaces and measured the effect of adsorption on their electric conductance. The increase in capacitance at the carbon nanotube interface (due to physisorption) disturbed carrier transport, while chemisorption induced charge transfer and resulted in an increase or decrease in the electric conductance. The principle of carrier transport in carbon nanotube films could be clearly explained by applying a fluctuation-induced tunneling model. Our model proved that the surface coverage ratio and the electric conductance change ratio are closely correlated.
Highlights
Carbon nanotubes (CNTs)[1] have been examined for use in transducers owing to their outstanding properties
To study the effect of electrical conductivity on molecular adsorption, Boyd et al.[13] examined the effects of CNT–CNT interactions by employing J/C metrics, where J indicates the number of CNT–CNT junctions and C indicates the number of interfaces between the CNTs and electrodes
If we assume that CNTs are conductors and CNT/CNT interfaces are small insulators, the fluctuation-induced tunneling (FIT) model can be applied
Summary
Estimation of adsorption energy for water molecules on a multi-walled carbon nanotube thin film by measuring electric resistance AIP Advances 6, 115212 (2016); https://doi.org/10.1063/1.4967784 Transport phenomena of electrons at the carbon nanotube interface with molecular adsorption Journal of Applied Physics 122, 015308 (2017); https://doi.org/10.1063/1.4992090
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