Effect of sensitizers on H2S sensing properties of ZnO nanowires

Gas sensing properties of pure and surface modified ZnO nanowires towards H₂S gas have been investigated. The hydrothermally grown ZnO nanowires network has been selectively modified with various sensitizers using RF sputtering to generate a 2×7 sensor array. After fabrication, the sensor array device has been investigated for its gas sensing properties. The optimal temperature for H₂S sensing has been observed to be 300°C. The maximum sensor response of S=52 was obtained for Au_5.7at% modified ZnO NWs with response and recovery times of 22 sec and 52 min, respectively. Concentration profile at 300°C revealed the same pattern with change in amplitude by changing H₂S concentration. The sensor array was able to detect H₂S both qualitatively and quantitatively based on the graphical pattern and position of the pattern, respectively.