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Vol. 34, No. 8(3), S&M3042

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Vol. 32, No. 8(2), S&M2292

Print: ISSN 0914-4935
Online: ISSN 2435-0869
Sensors and Materials
is an international peer-reviewed open access journal to provide a forum for researchers working in multidisciplinary fields of sensing technology.
Sensors and Materials
is covered by Science Citation Index Expanded (Clarivate Analytics), Scopus (Elsevier), and other databases.

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Sensors and Materials, Volume 15, Number 4 (2003)
Copyright(C) MYU K.K.
pp. 177-190
S&M519 Research Paper
Published: 2003

Examining the Gas-Sensing Behaviors of Carbon Nanotubes Using a Piezoelectric Quartz Crystal Microbalance [PDF]

Bee-Yu Wei, Ching-San Lin and Hong-Min Lin

(Received November 1, 2002; Accepted June 25, 2003)

Keywords: carbon nanotubes, piezoelectric quartz crystal microbalance (PQCM), gas sensors, frequency change, adsorption, sensitivity

Carbon nanotube bundles absorb gases very well since they have many adsorption sites. A gas sensor is demonstrated by deposition of carbon nanotube bundles on a piezoelectric quartz crystal. The sensor is utilized to detect the concentration of a flowing mixture of gases, determined from alterations in oscillation frequency. The detected gases included carbon monoxide, nitrogen dioxide, hydrogen, and nitrogen in air and the operation temperature varied from 25°C to 200°C. The prepared sensor is more sensitive at higher temperatures. The gas response is very low below 100°C. The preferred operating temperature is suggested to be 200°C. The oscillation frequency of the sensor increases when the gas sensor is exposed to the detected gases. An increase in frequency indicates a weight loss of the carbon nanotube, suggesting that the mechanism of detection is desorption, which is proposed to be caused by oxygen adsorption followed by desorption due to chemical reactions of the detected gas.

Corresponding author: Hong-Min Lin


Cite this article
Bee-Yu Wei, Ching-San Lin and Hong-Min Lin, Examining the Gas-Sensing Behaviors of Carbon Nanotubes Using a Piezoelectric Quartz Crystal Microbalance, Sens. Mater., Vol. 15, No. 4, 2003, p. 177-190.



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