In situ growth of porous ZnO nanosheet-built network film as high-performance gas sensor

Porous ZnO nanosheet-built network film was in situ grown on the surface of the Al2O3 ceramic tube as gas sensor via sol-gel hydrothermal method. The film was characterized by X-ray diffraction analysis, field emission scanning electron microscopy and transmission electron microscopy. The results demonstrate that the porous ZnO network film is of hexagonal wurtzite and mesoporous structure. The gas sensing property was also studied. The results indicate that the sensor shows high sensitivity and fast response to acetone and ethanol at 400 °C operating temperature, to H2S at 200 °C operating temperature, and to humidity at 25 °C operating temperature, respectively. Moreover, it also exhibits nice selectivity to H2S and humidity at its corresponding operating temperature, which makes the sensor have promising applications in gas detector.