Ramanathan, R and Nagarajan, S and Sathiyamoorthy, S and Manavaimaran, B and Barshilia, HC and Mallik, RC (2023) A highly sensitive and room temperature ethanol gas sensor based on spray deposited Sb doped SnO2 thin films. In: Materials Advances, 5 (1). pp. 293-305.
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Abstract
A room temperature ethanol gas sensor designed using antimony (Sb)-doped tin dioxide (SnO2, ATO) nanostructure thin films was prepared via the chemical spray pyrolysis method as a function of Sb concentration (0, 2, 4, 6, and 8 wt) at 420 °C. Structural, surface, optical, electrical, and temperature-dependent resistance studies were carried out using XRD, FESEM, UV-visible, and four-probe electrical resistivity techniques. Structural and surface microstructure analysis of the films confirms the nanostructure formation. Optical band gap and electrical resistivity studies demonstrate that the n-type conducting behavior of the films increased upon Sb doping. Temperature-dependent sheet resistance analysis confirms that ATO thin films exhibit maximum resistance stability up to 350 °C. The sensitivity of the fabricated ATO sensors strongly depends on the surface structure of the films, and the adsorbed gas molecules cause a change in the resistance of the films. A significant improvement was observed in the recovery and response times of the sensors as a function of Sb-doping content and ethanol exposure level. The maximum ethanol response achieved in the 6 wt Sb-doped SnO2 (ATO6) film was 842 for 50 ppm with a response and recovery time of 259/214 s, respectively. Hence, the ATO6 film exhibited a better sensing performance towards ethanol sensing applications. © 2024 RSC.
| Item Type: | Journal Article |
|---|---|
| Publication: | Materials Advances |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | The copyright for this article belongs to authors. |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 16 Nov 2024 15:23 |
| Last Modified: | 16 Nov 2024 15:23 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85314 |
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