Room temperature sensitivity of (SnO2–ZrO2) sol–gel thin films

Abstract Room temperature (H2S) gas detector of pure and doped tin oxide films were prepared by the sol–gel method. X-ray diffraction (XRD) and Scanning Electron Microscope (SEM) have studied the microstructure of these films. It revealed that the as-prepared films show amorphous structure and ultra-fine grains. The heat-treated films (773 K, 10 K/min), show a strong peak (101) besides the grains are oriented over the film surface. The room temperature sensitivity of the films of H2S gas was detected, a fast response 5 min and long age with high efficiency and reproducibility. Some models of detectors with different shapes and the electrical circuit were designed to detect H2S gas with high efficiency.

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