Effects of polymer coating on the adsorption of gas molecules on carbon nanotube networks
- Department of Physics, Kyungpook National University, Buk-Gu, Daegu 702-701 (Korea, Republic of)
Functionalization of carbon nanotubes (CNTs) with polymers such as polyethyleneimine or nafion was found to not change the adsorption properties of gas molecules on CNTs, although functionalization can remarkably enhance the sensitivity of gas sensors. Charge transfer between adsorbed molecules and single-walled carbon nanotubes (SWCNTs) at defect sites causes a steep and nonlinear conductance change at low gas concentrations, while molecules physically adsorbed on the pristine surfaces result in the linear electrical responses at higher concentrations. In addition, the molecular binding energies at defect sites of SWCNTs were measured to be 0.61 eV for NO{sub 2} and 0.53 eV for NH{sub 3}.
- OSTI ID:
- 21016126
- Journal Information:
- Applied Physics Letters, Vol. 91, Issue 9; Other Information: DOI: 10.1063/1.2778355; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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