纳米ZnO的固相合成及其气敏特性

以草酸为原料，与醋酸锌进行固相反应制得前驱化合物，进而热分解得到气敏材料氧化锌。将稀土元素中的镧和钕的氧化物以固相及液相两种合成方法添加到ＺｎＯ气敏材料中，并对材料的粒径、气敏性质进行了测定和表征．实验结果表明，用这种方法制备的氧化锌在低的工作温度下对乙醇气体的灵敏度较高，而且选择性较好，具有一定的应用前景．

Solid State Synthesis and Gas Sensing Properties of Nanometer ZnO

Precursors were synthesized by solid state reaction of zinc acetate with oxalic acid. ZnO gas sensing materials were obtained by decomposition of the precursors and characterized by XRD and TEM. La2O3 and Nd2O3 were doped in nanometre ZnO materials by the methods of solid state and liquid state reaction. The sensitivity of the materials was measured at various mole ratios of ZnO to La2O3 or Nd2O3. The gas sensitivity of ZnO element to C2H5OH, NH3 and LPG were measured in static state at a various operational temperatures. The results show that ZnO prepared by this method is highly sensitive to C2H5OH and selective between C2H5OH, NH3 and LPG at a low operational temperature.