Material dependent and temperature driven adsorption switching (p- to n- type) using CNT/ZnO composite-based chemiresistive methanol gas sensor

The present study correlates two simultaneous as well significant observations coming out from a single sensing prototype concerning the detection of volatile organic compounds (VOCs) by carbonaceous material based sensor. We have developed composite chemiresistive sensor utilizing different components (carbon nanotube (CNT) and zinc oxide (ZnO)). This is reflected in unique adsorption switching phenomena followed ‘p- to n-’ type transition characteristics above certain operating temperature (150 °C) VOC process. Noticeably, virtue switching, CNT/ZnO able operate dual mode sensor, which CNT dominates low region (? 150 ZnO at high (>150 with realistic ability. highly reproducible sensors (29 prototypes) are selective towards methanol (Response, R ? 73 ± 3 %) shows 8-fold enhancement response value compared neighbouring i.e., ethanol an °C very bias voltage 10 mV. Finally, (physisorption chemisorption) has been explained Fourier Transform Infrared Spectroscopy (FTIR) activation energy values along qualitatively typical full wave rectification