High-sensitivity and high-selectivity detection of methanol based on La-doped SnO2 sensor
Abstract
Pure SnO2 and La-doped SnO2 nanocomposite were prepared through hydrothermal method, and their gas sensing performances were studied. Results indicate that the sensing response of the 5 wt% La-doped SnO2 nanocomposite reached 29.5 when exposed to 75 ppm methanol at the optimal operating temperature of 220 °C, which was over seven times larger than that of pure SnO2 nanoparticles. In addition, the response and recovery time were shortened to 12 s and 7 s, respectively. Moreover, the 5 wt% La-doped SnO2 nanocomposite presents a good selectivity toward methanol among methanal, methanol, ammonia, acetone and benzene gases. The improvement in the gas sensing properties of the 5 wt% La-doped SnO2 nanocomposite toward methanol can be attributed to the smaller crystallite size, larger surface area and the modified chemical nature of nanocomposite surface.
- Publication:
-
Applied Physics A: Materials Science & Processing
- Pub Date:
- April 2020
- DOI:
- 10.1007/s00339-020-03478-6
- Bibcode:
- 2020ApPhA.126..299C
- Keywords:
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- La-doped;
- SnO<SUB>2</SUB>;
- Nanoparticles;
- Methanol;
- Gas sensor