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.
Highlights
In recent years, electronic nose system developers [1,2,3,4,5] have striven to reduce the price and size and increase the reproduction levels and reaction rates of the systems, and to construct systems that simultaneously monitor multiple gases [6,7]
The results indicated that the polypeptide-multiple-walled carbon nanotube (MWCNT) film recognized ammonia and distinguished the trimethylamine (TEA) vapor from the gases
We developed a conductive MWCNT-polypeptide composite sensing material using a two-step approach
Summary
Electronic nose system developers [1,2,3,4,5] have striven to reduce the price and size and increase the reproduction levels and reaction rates of the systems, and to construct systems that simultaneously monitor multiple gases [6,7]. The sensor materials used to construct chemical resistors are divided into two major types: inorganic semiconductors [8,9] and organic polymers [10,11,12], both of which respond to the adsorptive analytes that trigger physical reactions, subsequently changing resistivity or the dielectric constant. These sensing materials can be deposited on a thin film to fabricate chemical resistors. Polymers [17,18] and molecularly imprinted polymers [19] have been used to identify various chemical vapors in several studies
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