A bio-inspired two-layer sensing structure of polypeptide and multiple-walled carbon nanotube to sense small molecular gases

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...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Switzerland), 2015-03, Vol.15 (3), p.5390-5401
Main Authors: Wang, Li-Chun, Su, Tseng-Hsiung, Ho, Cheng-Long, Yang, Shang-Ren, Chiu, Shih-Wen, Kuo, Han-Wen, Tang, Kea-Tiong
Format: Article
Language:English
Subjects:
Ammonia
Ammonia - chemistry
Ammonia - isolation & purification
bio-inspired
Biosensing Techniques - instrumentation
Carbon
Carbon nanotubes
gas sensing
Gases
Gases - chemistry
Gases - isolation & purification
Ligands
Molecular gases
Monitors
multiple-walled carbon nanotube (MWCNT)
Nanotubes, Carbon - chemistry
Odorants
Organic compounds
Peptides - chemistry
Polymers
polypeptide
Polypeptides
Semiconductors
Sensors
two-layer structure
VOCs
Volatile organic compounds
Volatile Organic Compounds - chemistry
Volatile Organic Compounds - isolation & purification
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Summary: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.
ISSN:1424-8220
1424-8220
DOI:10.3390/s150305390