期刊
JOURNAL OF ELECTRONIC MATERIALS
卷 46, 期 4, 页码 2476-2482出版社
SPRINGER
DOI: 10.1007/s11664-017-5316-0
关键词
ZnO; microrods; hydrothermal; gas sensor; methanol
资金
- CSIR-CMERI [OLP 190412]
In the present work, zinc oxide (ZnO) microrods with the average diameter of 350 nm have been synthesized on fluorine doped tin oxide (FTO) substrate using a hydrothermal reaction process at a low temperature of 90A degrees C. The methanol gas sensing behaviour of as-synthesized ZnO microrods have been studied at different operating temperatures (100-300A degrees C). The gas sensing results show that the ZnO microrods exhibit excellent sensitivity, selectivity, and stability toward methanol gas at 300A degrees C. The as-grown ZnO microrods sensor also shows the good sensitivity for methanol even at a low operating temperature of 100A degrees C. The ultra-high sensitivity of 4.41 x 10(4)% [gas sensitivity, S (g) = (I (g) - I (a))/I (a) x 100%] and 5.11 x 10(2)% to 100 ppm methanol gas at a temperature of 300A degrees C and 100A degrees C, respectively, has been observed. A fast response time of 200 ms and 270 ms as well as a recovery time of 120 ms and 1330 ms to methanol gas have also been found at an operating temperature of 300A degrees C and 100A degrees C, respectively. The response and recovery time decreases with increasing operation temperature of the sensor.
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