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Article

Solid State Electronic Sensors for Detection of Carbon Dioxide

by 1 and 2,*
1
KBR Wyle Inc. at NASA Ames Research Center, CA 94035, USA
2
NASA Ames Research Center, CA 94035, USA
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(18), 3848; https://doi.org/10.3390/s19183848
Received: 10 July 2019 / Revised: 18 August 2019 / Accepted: 1 September 2019 / Published: 6 September 2019
(This article belongs to the Section Chemical Sensors)
Detection of carbon dioxide (CO2) is very important for environmental, health, safety and space applications. We have studied novel multiwall carbon nanotubes (MWCNTs) and an iron oxide (Fe2O3) nanocomposite based chemiresistive sensor for detection of CO2 at room temperature. The sensor has been miniaturized to a chip size (1 cm × 2 cm). Good sensing performance was observed with a wide detection range of CO2 concentrations (100–6000 ppm). Structural properties of the sensing materials were characterized using Field-Emission Scanning Electron Microscopy, Fourier-Transform Infrared and Raman spectroscopies. The greatly improved sensitivity of the composite materials to CO2 can be attributed to the formation of a depletion layer at the p-n junction in an MWCNT/iron oxide heterostructure, and new CO2 gas molecules adhere to the high surface area of MWCNTs due to the concentration gradient. The test results showed that the CO2 sensor possesses fast response, compact size, ultra-low power consumption, high sensitivity and wide dynamic detection range. View Full-Text
Keywords: carbon dioxide sensor; CO2 sensor; gas sensor; room temperature gas sensing; functionalized nanotubes; electronic nose; smartphone sensor; chemiresistive sensor; nanocomposite carbon dioxide sensor; CO2 sensor; gas sensor; room temperature gas sensing; functionalized nanotubes; electronic nose; smartphone sensor; chemiresistive sensor; nanocomposite
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MDPI and ACS Style

Hannon, A.; Li, J. Solid State Electronic Sensors for Detection of Carbon Dioxide. Sensors 2019, 19, 3848. https://doi.org/10.3390/s19183848

AMA Style

Hannon A, Li J. Solid State Electronic Sensors for Detection of Carbon Dioxide. Sensors. 2019; 19(18):3848. https://doi.org/10.3390/s19183848

Chicago/Turabian Style

Hannon, Ami, and Jing Li. 2019. "Solid State Electronic Sensors for Detection of Carbon Dioxide" Sensors 19, no. 18: 3848. https://doi.org/10.3390/s19183848

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