4.7 Article

Effect of Humidity on Gas Sensing Performance of Carbon Nanotube Gas Sensors Operated at Room Temperature

Journal

IEEE SENSORS JOURNAL
Volume 21, Issue 5, Pages 5763-5770

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSEN.2020.3038647

Keywords

Humidity; Sensors; Temperature measurement; Gas detectors; X-ray diffraction; Temperature sensors; X-ray scattering; Carbon nanotubes; cross-sensitivity; gas sensors; humidity; volatile organic compounds

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The study found that an increase in humidity can reduce the electrical conductivity of CNT gas sensors by around 4%, but for humidity above 80%, the conductivity slightly increases. Additionally, the response of the sensors to volatile organic compounds decreases by 40% with a change in humidity up to 80%.
Carbon nanotubes (CNTs) have shown promising results for gas sensing due to their high surface area. Since humidity has a great impact on the electrical conductivity of resistive CNT gas sensors, we have investigated the change of humidity on their sensing properties. In this study, we fabricated vertically aligned CNT-based gas sensors for the detection of volatile organic compounds. The morphologies and phase structures of the fabricated samples were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR), confirming the presence of CNT with some surface impurities. It was found that a relative humidity increase from 10% to 80% can reduce the electrical conductivity of the sensor by around 4%. On the other hand, for a humidity above 80% the conductivity increased slightly. The fabricated device has been used as a gas sensor for volatile organic compounds, and the cross-sensitivity to humidity was investigated. It was found that in the fabricated sensors, a change in humidity up to 80% results in a 40% decrease in the response for the studied organic compounds.

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