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Delafossite CuGaO2 nanomaterial-based room temperature H2S selective gas sensor.

Authors :
Kumar, Amit
Barala, Suraj
Ganaie, Mubashir Mushtaq
Kumar, Mahesh
Source :
Journal of Materials Chemistry C; 11/7/2024, Vol. 12 Issue 41, p16854-16863, 10p
Publication Year :
2024

Abstract

To minimize harmful gas exposure and enable early disease diagnoses in low-resource settings, it is crucial to create an H<subscript>2</subscript>S gas sensor that can detect low ppb levels at room temperature (RT). H<subscript>2</subscript>S is both a widespread environmental pollutant and a significant breath biomarker for several diseases. Nevertheless, the development of portable inhaled gas sensors faces significant obstacles in achieving extremely sensitive and quick detection of H<subscript>2</subscript>S gas at low temperatures, specifically at the ppm level. In order to tackle this problem, we demonstrate delafossite CuGaO<subscript>2</subscript> as a highly effective material deposited by RF sputtering for H<subscript>2</subscript>S sensing at RT. We connected two sensors in parallel, one with high selectivity towards H<subscript>2</subscript>S at RT and another with a high response working at 50 °C from the same materials. The delafossite CuGaO<subscript>2</subscript> film shows the most significant response of 10.7% at 50 ppm of H<subscript>2</subscript>S, capable of detecting concentrations as low as 54.3 ppb at RT. The response time was ∼55 s, while the recovery time was ∼135 s with a high selectivity towards H<subscript>2</subscript>S. Increasing the sensor temperature to 50 °C, an immediate escalation in the response by more than twofold around 25.03% with slight disturbance in the selectivity was observed, with LOD of 12.68 ppb and response and recovery times of ∼66 s and 258 s, respectively. The CuGaO<subscript>2</subscript> sensor demonstrated acceptable resistance/response variation towards different humidity, repeatability, long-term stability, and minimal change in cross-selectivity at both temperatures. This detection method at RT and 50 °C will assist in the development of cutting-edge manufacturing procedures that have the potential to enhance gas sensor technology. This will allow manufacturers to make a portable sensor that is suitable for real-time sensing applications. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
20507526
Volume :
12
Issue :
41
Database :
Complementary Index
Journal :
Journal of Materials Chemistry C
Publication Type :
Academic Journal
Accession number :
180473037
Full Text :
https://doi.org/10.1039/d4tc02872d