Journal
NANOSCALE RESEARCH LETTERS
Volume 8, Issue -, Pages -Publisher
SPRINGER
DOI: 10.1186/1556-276X-8-12
Keywords
Gas sensors; Carboxylic acid functionalized; Single-walled carbon nanotubes; Mixture gas
Funding
- World Class University (WCU) Project of Ministry of Education, Science and Technology (Korea Science and Engineering Foundation) [R32-2009-000-10082-0]
- Industrial Core Technology Development Program
- Ministry of Knowledge Economy [10037394]
- Basic Science Research Program through National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology [2012R1A1A3013893]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10037394] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2012R1A1A3013893, R32-2012-000-10082-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Carbon nanotubes (CNT) are extremely sensitive to environmental gases. However, detection of mixture gas is still a challenge. Here, we report that 10 ppm of carbon monoxide (CO) and ammonia (NH3) can be electrically detected using a carboxylic acid-functionalized single-walled carbon nanotubes (C-SWCNT). CO and NH3 gases were mixed carefully with the same concentrations of 10 ppm. Our sensor showed faster response to the CO gas than the NH3 gas. The sensing properties and effect of carboxylic acid group were demonstrated, and C-SWCNT sensors with good repeatability and fast responses over a range of concentrations may be used as a simple and effective detection method of CO and NH3 mixture gas.
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