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Sensors 2010, 10(5), 4898-4906; doi:10.3390/s100504898
Communication

High Sensitivity Carbon Nanotubes Flow-Rate Sensors and Their Performance Improvement by Coating

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Received: 26 March 2010; in revised form: 17 April 2010 / Accepted: 25 April 2010 / Published: 14 May 2010
(This article belongs to the Section Physical Sensors)
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Abstract: A new type of hot-wire flow-rate sensor (HWFS) with a sensing element made of a macro-sized carbon nanotube (CNT) strand is presented in this study. An effective way to improve repeatability of the CNT flow-rate sensor by coating a layer of Al2O3 on the CNT surface is proposed. Experimental results show that due to the large surface-to-volume ratio and thin coated Al2O3 layer, the CNT flow-rate sensor has higher sensitivity and faster response than a conventional platinum (Pt) HWFS. It is also demonstrated that the covered CNT flow-rate sensor has better repeatability than its bare counterpart due to insulation from the surrounding environment. The proposed CNT flow-rate sensor shows application potential for high-sensitivity measurement of flow rate.
Keywords: flow-rate sensor; carbon nanotube; hysterisis error; coating flow-rate sensor; carbon nanotube; hysterisis error; coating
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Yang, X.; Zhou, Z.; Wang, D.; Liu, X. High Sensitivity Carbon Nanotubes Flow-Rate Sensors and Their Performance Improvement by Coating. Sensors 2010, 10, 4898-4906.

AMA Style

Yang X, Zhou Z, Wang D, Liu X. High Sensitivity Carbon Nanotubes Flow-Rate Sensors and Their Performance Improvement by Coating. Sensors. 2010; 10(5):4898-4906.

Chicago/Turabian Style

Yang, Xing; Zhou, Zhaoying; Wang, Dingqu; Liu, Xiaoli. 2010. "High Sensitivity Carbon Nanotubes Flow-Rate Sensors and Their Performance Improvement by Coating." Sensors 10, no. 5: 4898-4906.


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