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以醋酸锌为前驱物,采用水热方法在160℃水热条件下生成了具有规则几何外形的ZnSnO3多面体。利用XRD物相分析可知,该ZnSnO3的物相属于ABO3型钙钛矿结构。利用FESEM和TEM形貌观察可知,ZnSnO3多面体具有截角八面体的几何特征,其径向尺寸为1～1.2μm,其平均直径约为500 nm。以ZnSnO3截角八面体为敏感材料,采用传统旁热式结构制成气敏元件,研究其对HCHO的敏感性能。结果表明,这种方法制备的纯ZnSnO3截角八面体微晶对甲醛具有良好的敏感特性。
ZnSnO3 polyhedrons with regular geometric shape were produced by the hydrothermal method at 160 ℃ under the hydrothermal conditions using zinc acetate as precursor. XRD phase analysis shows that the phase of the ZnSnO3 belongs to the ABO3-type perovskite structure. Using FESEM and TEM, we can see that the ZnSnO3 polyhedron has the truncated octahedron geometry with a radial size of 1 ~ 1.2μm and an average diameter of about 500 nm. Taking the ZnSnO3 truncated octahedron as the sensitive material, a gas sensing element made of the traditional side-heated structure was used to study its sensitivity to HCHO. The results show that pure ZnSnO3 truncated octahedral microcrystals prepared by this method have good sensitivity to formaldehyde.