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Sensors 2015, 15(3), 5390-5401; doi:10.3390/s150305390

A Bio-Inspired Two-Layer Sensing Structure of Polypeptide and Multiple-Walled Carbon Nanotube to Sense Small Molecular Gases

1
Analytical Chemistry Section, Chung-Shan Institute of Science & Technology, Hsinchu 30325, Taiwan
2
Department of Electrical Engineering, National Tsing Hua University, No. 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan
3
Department of Chemistry, National Central University, Taoyuan 32001, Taiwan
*
Author to whom correspondence should be addressed.
Academic Editor: Ki-Hyun Kim
Received: 21 August 2014 / Revised: 10 February 2015 / Accepted: 15 February 2015 / Published: 5 March 2015
(This article belongs to the Special Issue Modern Technologies for Sensing Pollution in Air, Water, and Soil)
View Full-Text   |   Download PDF [16732 KB, uploaded 5 March 2015]   |  

Abstract

In this paper, we propose a bio-inspired, two-layer, multiple-walled carbon nanotube (MWCNT)-polypeptide composite sensing device. The MWCNT serves as a responsive and conductive layer, and the nonselective polypeptide (40 mer) coating the top of the MWCNT acts as a filter into which small molecular gases pass. Instead of using selective peptides to sense specific odorants, we propose using nonselective, peptide-based sensors to monitor various types of volatile organic compounds. In this study, depending on gas interaction and molecular sizes, the randomly selected polypeptide enabled the recognition of certain polar volatile chemical vapors, such as amines, and the improved discernment of low-concentration gases. The results of our investigation demonstrated that the polypeptide-coated sensors can detect ammonia at a level of several hundred ppm and barely responded to triethylamine. View Full-Text
Keywords: bio-inspired; two-layer structure; multiple-walled carbon nanotube (MWCNT); polypeptide; gas sensing bio-inspired; two-layer structure; multiple-walled carbon nanotube (MWCNT); polypeptide; gas sensing
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. (CC BY 4.0).

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MDPI and ACS Style

Wang, L.-C.; Su, T.-H.; Ho, C.-L.; Yang, S.-R.; Chiu, S.-W.; Kuo, H.-W.; Tang, K.-T. A Bio-Inspired Two-Layer Sensing Structure of Polypeptide and Multiple-Walled Carbon Nanotube to Sense Small Molecular Gases. Sensors 2015, 15, 5390-5401.

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