<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml"><p>Organic chemical hazardous gases pose a significant threat to human life and the environment. An urgent need exists for the development of reliable chemical sensors that would be able to identify these hazardous gases. In a recent study, conductive carbon nanotubes were mixed with six polymers with various chemical adsorption properties to produce a composite thin film for the fabrication of a chemical sensor array. A silicon wafer was used as a microelectrode substrate for a resistance sensor fabricated using a typical semiconductor manufacturing process. This sensor array was then used to identify hazardous chemical gases at various temperatures. Results for two hazardous gases, ammonia (NH3) and chloroform (CHCl3), tested with the six polymers at different temperatures, indicated that the variation in sensitivity/resistance increased when the temperature increased. It was found that the MWNTs-PVP and MWNTs-PMVEMA sensing films had high sensitivity, excellent selectivity, and favorable reproducibility in detecting the two chemical agent vapors. In addition, we derived the solubility parameter (Δδ) to demonstrate the sensitivity of the polymers to ammonia (NH3). The results showed that smaller solubility parameter corresponds to a stronger interaction between NH3 gas and polymers, and increased sensitivity. Additionally, we used the statistical methods of principal component analysis to identify the interaction of hazardous gases with the MWNTs-polymer sensor.</p></abstract>

Organic chemical hazardous gases pose a significant threat to human life and the environment. An urgent need exists for the development of reliable chemical sensors that would be able to identify these hazardous gases. In a recent study, conductive carbon nanotubes were mixed with six polymers with various chemical adsorption properties to produce a composite thin film for the fabrication of a chemical sensor array. A silicon wafer was used as a microelectrode substrate for a resistance sensor fabricated using a typical semiconductor manufacturing process. This sensor array was then used to identify hazardous chemical gases at various temperatures. Results for two hazardous gases, ammonia (NH3) and chloroform (CHCl3), tested with the six polymers at different temperatures, indicated that the variation in sensitivity/resistance increased when the temperature increased. It was found that the MWNTs-PVP and MWNTs-PMVEMA sensing films had high sensitivity, excellent selectivity, and favorable reproducibility in detecting the two chemical agent vapors. In addition, we derived the solubility parameter (Δδ) to demonstrate the sensitivity of the polymers to ammonia (NH3). The results showed that smaller solubility parameter corresponds to a stronger interaction between NH3 gas and polymers, and increased sensitivity. Additionally, we used the statistical methods of principal component analysis to identify the interaction of hazardous gases with the MWNTs-polymer sensor.

Detection of organic chemical vapors with a MWNTs-polymer array chemiresistive sensor

Deparment of Chemistry, R. O. C. Military Academy, Kaohsiung, Taiwan

Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan

Materials Science-Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Organic chemical hazardous gases pose a significant threat to human life and the environment. An urgent need exists for the development of reliable chemical...

Detection of organic chemical vapors with a MWNTs-polymer array chemiresistive sensor

Pubblicato online: 26 mar 2014

Pagine: 50 - 58

DOI: https://doi.org/10.2478/s13536-013-0160-2

Parole chiave
chemical hazardous gases, multi-walled carbon nanotube — MWNT, resistance sensor array, primary component analysis

© 2014 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Detection of organic chemical vapors with a MWNTs-polymer array chemiresistive sensor

Pubblicato online: 26 mar 2014

Pagine: 50 - 58

DOI: https://doi.org/10.2478/s13536-013-0160-2

Parole chiavechemical hazardous gases, multi-walled carbon nanotube — MWNT, resistance sensor array, primary component analysis

© 2014 Wroclaw University of Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Parole chiave
chemical hazardous gases, multi-walled carbon nanotube — MWNT, resistance sensor array, primary component analysis