Preparation and Gas Sensing Properties of ZnO Porousmaterials Using Carbon Nanospheres as Pore Former

ZnO porousmaterials were synthesized with carbon nanospheres as pore former, which were prepared from glucose by hydrothermal method. The synthesized ZnO porousmaterials were characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD), and N₂ adsorption-desorption, respectively. The gas-sensing properties of ZnO porousmaterials were investigated. The experimental results show when ZnO porousmaterials are prepared by doping with 50 m L of carbon nanospheres, the highest sensitivity is obtained under the optimal conditions. The response reaches 393.8 when the volume fraction of acetic acid is 1 000 × 10^-6 at the operating temperature of 310 ℃ with the relative humidity(RH) of 50%, which is 63.6 times as high as that of pure ZnO porousmaterials.