Jump to main content
Jump to site search

Issue 12, 2011
Previous Article Next Article

Humidity-assisted selective reactivity between NO2 and SO2 gas on carbon nanotubes

Author affiliations

Abstract

In spite of the technical importance of detecting environmental SOx and NOx gases, a selective detection has not been realized because of their similar chemical properties. In this report, adsorption and desorption of SO2 and NO2 gas on carbon nanotubes are investigated in terms of different humidity levels at room temperature. A random-network single walled carbon nanotube (SWCNT) resistor is constructed by a dip-pen method using a SWCNT/dichloroethane (DCE) solution. In the case of SO2 gas adsorption, the resistance increases at high humidity level (92%) and shows no obvious change at low humidity levels. On the other hand, in the case of NO2 gas adsorption, the resistance always decreases independent of moisture levels. Our density functional theory (DFT) calculations show that this selective behavior originates from cooperative charge compensation between the SO2nH2O complex and the p-type CNT resistor. The change of response time and recovery time with different moisture levels is further investigated. This humidity-assisted gas reaction provides a simple route to detect these two gases selectively.

Graphical abstract: Humidity-assisted selective reactivity between NO2 and SO2 gas on carbon nanotubes

Back to tab navigation

Article information


Submitted
26 Sep 2010
Accepted
26 Nov 2010
First published
07 Feb 2011

J. Mater. Chem., 2011,21, 4502-4508
Article type
Paper

Humidity-assisted selective reactivity between NO2 and SO2 gas on carbon nanotubes

F. Yao, D. L. Duong, S. C. Lim, S. B. Yang, H. R. Hwang, W. J. Yu, I. H. Lee, F. Güneş and Y. H. Lee, J. Mater. Chem., 2011, 21, 4502
DOI: 10.1039/C0JM03227A

Search articles by author

Spotlight

Advertisements