Mechanistic Analysis of MWCNT/ZnO Composite Film Gas Sensor Based on NOx Gas Detection Characteristics

다국어 초록 (Multilingual Abstract)

A NOx gas sensor was fabricated using a multi-walled carbon nanotube (MWCNT)/zinc oxide composite film. Gas sensors require characteristics such as high speed, sensitivity, and selectivity. Thus, carbon nanotubes (CNTs) having good electronic properties, chemical stability, and great conductivity and zinc oxide, a wide band-gap semiconductor with a large exciton binding energy, were selected in this study.
The fabricated gas sensor was used to detect NOx gas at different concentrations. The gas sensor absorbed NOx gas molecules with an associated increase in the sensitivity. The sensitivity of the gas sensor increased with increasing gas concentration. By varying the temperature inside the chamber of the MWCNT/ZnO composite film gas sensor, the sensitivity and normalized response for detecting NOx gas was determined. Based on comparative analysis with ZnO, the MWCNT film gas sensor is excellent for detecting NOx gas. The experimental data confirmed the enhanced gas sensing properties and sensor performance derived from the electronic interaction between the MWCNTs and ZnO film.