| Abstrakt: |
To minimize harmful gas exposure and enable early disease diagnoses in low-resource settings, it is crucial to create an H2S gas sensor that can detect low ppb levels at room temperature (RT). H2S 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 H2S gas at low temperatures, specifically at the ppm level. In order to tackle this problem, we demonstrate delafossite CuGaO2 as a highly effective material deposited by RF sputtering for H2S sensing at RT. We connected two sensors in parallel, one with high selectivity towards H2S at RT and another with a high response working at 50 °C from the same materials. The delafossite CuGaO2 film shows the most significant response of 10.7% at 50 ppm of H2S, 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 H2S. 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 CuGaO2 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] |
