A high sensitivity gas sensor for formaldehyde based on CdO and In<sub>2</sub>O<sub>3</sub> doped nanocrystalline SnO<sub>2</sub>
Chen, T; Liu, Q J; Zhou, Z L; Wang, Y D; Wang, Y D;; Chen, T; Department of Materials Science and Engineering, Yunnan University, 650091 Kunming, People’s Republic of China; Liu, Q J; Department of Materials Science and Engineering, Yunnan University, 650091 Kunming, People’s Republic of China; Zhou, Z L; Department of Materials Science and Engineering, Yunnan University, 650091 Kunming, People’s Republic of China
Журнал:
Nanotechnology
Дата:
2008-03-05
Аннотация:
The gas-sensing characteristics of In<sub>2</sub>O<sub>3</sub> and CdO doped nanocrystalline SnO<sub>2</sub> compounds for formaldehyde were investigated in this study. The phases of the resulting materials and the morphologies of the sensing layers were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Indirect-heating sensors using SnO<sub>2</sub>–In<sub>2</sub>O<sub>3</sub>–CdO compounds as sensitive materials were fabricated on an alumina tube with Au electrodes and platinum wires. All measurements were performed at several operating temperatures from 100 to 180 °C. Good gas-sensing responses to formaldehyde have been found for all the prepared samples. It is shown that the sensors exhibited high sensitivity at low operating temperature (133 °C), making them promising candidates for practical detectors for formaldehyde.
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