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A High-Sensitivity Gas Sensor Toward Methanol Using ZnO Microrods: Effect of Operating Temperature

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Abstract

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 90°C. The methanol gas sensing behaviour of as-synthesized ZnO microrods have been studied at different operating temperatures (100–300°C). The gas sensing results show that the ZnO microrods exhibit excellent sensitivity, selectivity, and stability toward methanol gas at 300°C. The as-grown ZnO microrods sensor also shows the good sensitivity for methanol even at a low operating temperature of 100°C. The ultra-high sensitivity of 4.41 × 104% [gas sensitivity, S g = (I g − I a)/I a × 100%] and 5.11 × 102% to 100 ppm methanol gas at a temperature of 300°C and 100°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 300°C and 100°C, respectively. The response and recovery time decreases with increasing operation temperature of the sensor.

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Authors and Affiliations

  1. CSIR-Central Mechanical Engineering Research Institute, Durgapur, 713209, India

    M. Sinha, B. Mondal & R. Ghosh

  2. Department of Electronics and Communications Engineering, National Institute of Technology, Durgapur, 713209, India

    M. Sinha & R. Mahapatra

Authors
  1. M. Sinha
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  2. R. Mahapatra
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  3. B. Mondal
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  4. R. Ghosh
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Correspondence to R. Ghosh.

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Sinha, M., Mahapatra, R., Mondal, B. et al. A High-Sensitivity Gas Sensor Toward Methanol Using ZnO Microrods: Effect of Operating Temperature. J. Electron. Mater. 46, 2476–2482 (2017). https://doi.org/10.1007/s11664-017-5316-0

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