不同离子对氧化锌晶体形貌的影响

以不同Zn盐Zn(CH3COO)2.2H2O,ZnCl2,ZnSO4.7H2O,Zn(NO3)2.6H2O与不同碱NaOH,KOH为原料,制得Zn(OH)42-前驱溶液,使之在水热环境下分解,生成ZnO晶体.产物通过全自动X射线衍射仪(XRD)进行物相分析,扫描电子显微镜(SEM)观测ZnO晶体的形貌和大小.170℃,溶液中的阴离子CH3COO-,SO42-,NO3-,Cl-分别与Na+构成干扰离子对,伴随着晶体生长12 h,晶体成长为片球集状、极性生长明显的花状、极性生长不明显的花状、小尺寸花状ZnO晶体;140℃,溶液中阳离子Na+,K+分别与CH3COO-作为离子对,干扰晶体生长,12 ...

Effects of Different Ions on Morphology of ZnO Crystals

Different Zn salts including Zn(CH3COO)2·2H2O, ZnCl2, Zn(NO3)2·6H2O and ZnSO4·7H2O and different alkalies including NaOH and KOH were used as raw materials to produce the precursory solution Zn(OH)4^2-, and ZnO crystals were synthesized when Zn(OH)4^2- decomposed in hydrothermal environment. The phase identification, morphology and size of the products were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The anions of CH3COO^-, SO4^2-, NO3^- and Cl^- in the solution formed individually interfering ion pairs with Na⁺ at 170°C. The morphologies of ZnO crystals obtained along with their growth for 12 h are flake/ball-like aggregates, bloomy with obvious of unobvious polarity growth and small-size bloomy. In addition, the ion pairs formed individually by Na⁺, K⁺ and CH3COO^- at 140°C interfered the crystal growing and, after reacting for 12 h, they were prepared into flaky and needle-like ZnO nanocrystals. It could be known from the analysis of SEM images that different interfering ions in the solution have great effects on the morphologies of ZnO crystals. And the interference mechanism of the interfering ions was analyzed simply.