Zn_2SO_4(OH)_2·2H_2O与ZnO晶须的制备及其生长机制

Synthesis and Growth Mechanism of Zn_2SO_4(OH)_2·2H_2O and ZnO Whiskers

以Zn2SO4·7H2O为原料,Na OH为沉淀剂,采用液相沉淀及烧结方法制备了Zn2SO4(OH)2·2H2O与Zn O晶须,样品采用XRD、SEM及TG-DTA等对样品物相、形貌及热行为进行了表征,结果表明晶须品质优良:其分散性好,粒度分布均匀、表面光滑。又从"生长基元"角度出发,讨论了Zn2SO4(OH)2·2H2O晶须的形成机制,其生长过程是生长基元八面体[Zn-(OH)6]4-与HSO-4往某一晶面稳定叠合生长的结果,Zn2SO4(OH)2·2H2O晶须经热分解后,其形貌不变,最终变为Zn O晶须。

Using Zn2SO4·7H2O,Na OH as raw material,high-quality Zn2SO4（ OH）2·2H2O and Zn O whisker was synthesized via liquid precipitation reaction and sintering methods process. The phase,granularity,structure of crystal morphology of whiskers samples were characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM） and thermal analysis（ TG-DTA）. The SEM result revealed that ： ① the whiskers formed with fine dispersive capability,② the crystal formed with good whisker quality,③ the surface was smooth,and ④ the particle was dispersed in uniform distribution.From the point of growth units,the growth mechanism of Zn2SO4（ OH）2·2H2O whisker was investigated in this work. The growth unit of Zn2SO4（ OH）2·2H2O whisker is[Zn-（ OH）6]4-. The growth process of whisker was determined to be [Zn-（ OH）6]4-and HSO-4piles up towards one-dimensional direction and eventually forms whiskers. After thermal decomposition, the morphology was the same, and Zn2SO4（ OH）2·2H2Owhiskers eventually became the Zn O whiskers.