Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 125, Issue 1, Pages 92-99Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2007.01.044
Keywords
CO; sensor; multiwall carbon nanotubes; polydiphenylamine
Funding
- Korea Institute of Industrial Technology(KITECH) [10017624] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [과06B1508] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A novel amperometric sensor based on multi-wall carbon nanotubes (MWNT) grafted polydiphenylamine (PDPA), MWNT-g-PDPA, has been developed for the determination of carbon monoxide (CO). Cyclic voltammetry is used to fabricate the modified electrode and to demonstrate the electroactivity of MWNT-g-PDPA-ME toward gaseous CO. The MWNT-g-PDPA-ME exhibits high sensitivity for oxidation of CO in a 0.5 M HClO4 solution. Chronoamperometry is carried to determine the working range of CO at MWNT-g-PDPA-ME. The dependence of the response current on CO concentration is explored under optimal conditions and an excellent linear concentration range between 10 and 200 ppm (correlation coefficient r = 0.9941) with a substantially low detection limit of 0.01 ppm is obtained. Further, the response and recovery transients of CO gas at MWNT-g-PDPA-ME are determined. (c) 2007 Elsevier B.V. All rights reserved.
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