Effects of polymer coating on the adsorption of gas molecules on carbon nanotube networks

Journal Article · Mon Aug 27 00:00:00 EDT 2007 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.2778355· OSTI ID:21016126

Kim, Sanghun; Lee, Hyeong Rag; Yun, Yong Ju; Ji, Seungmuk; Yoo, Kwonjae; Yun, Wan Soo; Koo, Ja-Yong; Ha, Dong Han ^[1]

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1. 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

Related Subjects

36 MATERIALS SCIENCE
ADSORPTION
AMMONIA
BINDING ENERGY
CARBON
CHARGE EXCHANGE
COATINGS
ELECTRIC CONDUCTIVITY
NANOTUBES
NITROGEN DIOXIDE
POLYMERS
SENSORS