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以ZnCl2和NaOH为原料由凝胶-网络法制备了纳米ZnO粉体和掺杂La2O3的ZnO粉体,利用X射线衍射仪和扫描电镜对两种粉体的形貌和结构进行了表征。研究表明,用凝胶网络法制备的两种粉体的结晶情况良好,分布均匀,平均粒径分别为29nm和25nm。以掺杂不同金属氧化物的ZnO纳米粉体为原料,制备了旁热式厚膜型气敏元件,对比实验表明,掺杂的元件对甲醛气体的灵敏度比纯ZnO的灵敏度高,且掺杂La2O3后的ZnO气敏元件具有较高的灵敏度和较好的选择性。
ZnO powders and ZnO powders doped with La2O3 were prepared by gel-network method using ZnCl2 and NaOH as raw materials. The morphology and structure of the two powders were characterized by X-ray diffraction and scanning electron microscopy. The results show that the two kinds of powders prepared by gel network method have good crystallinity and uniform distribution with average particle sizes of 29 nm and 25 nm, respectively. ZnO thin films doped with different metal oxides were used as raw materials to prepare the by-pass thick-film type gas sensor. The comparative experiments show that the sensitivity of the doped components to formaldehyde gas is higher than that of pure ZnO, ZnO gas sensor after La2O3 has higher sensitivity and better selectivity.