引用本文:
许泳吉, 张利, 赵雪萍. 纳米片状ZnO的室温制备及其胶状前体的稳定性分析[J]. 应用化学,
2012, 29(9): 1036-1040.
doi:
10.3724/SP.J.1095.2012.00477
Citation: XU Yongji, ZHANG Li, ZHAO Xueping. Synthesis of ZnO Nano Flake at Room Temperature and the Stability of Colloidal Precursors[J]. Chinese Journal of Applied Chemistry, 2012, 29(9): 1036-1040. doi: 10.3724/SP.J.1095.2012.00477
Citation: XU Yongji, ZHANG Li, ZHAO Xueping. Synthesis of ZnO Nano Flake at Room Temperature and the Stability of Colloidal Precursors[J]. Chinese Journal of Applied Chemistry, 2012, 29(9): 1036-1040. doi: 10.3724/SP.J.1095.2012.00477
纳米片状ZnO的室温制备及其胶状前体的稳定性分析
摘要:
以醋酸锌和氢氧化钠为原料,采用室温直接沉淀法得到了ZnO的前体胶状醋酸锌碱式盐,通过控制pH值,在室温下分别制备了碱式盐Zn5(OH)8(Ac)2·2H2O和六方晶系纤锌矿ZnO,并利用X射线衍射、扫描电子显微镜和能谱(EDS)等测试技术对产物进行表征。结果表明,采用直接沉淀法在pH值为7的环境下得到了具有{n{[Zn5(OH)8(H2O)2]2+}·(2n-x)Ac-}x+·xAc-胶团结构的稳定胶体体系,室温下干燥后的产物的成分为碱式盐Zn5(OH)8(Ac)2·2H2O;而在pH值为14时,胶状前体发生聚沉生成白色沉淀,室温干燥后得到纳米片状ZnO。还考察了pH值对胶状前体稳定性的影响,并探讨了ZnO的生成机理。
English
Synthesis of ZnO Nano Flake at Room Temperature and the Stability of Colloidal Precursors
Abstract:
Colloidal precursors were synthesized by precipitation method using zinc acetate(ZnAc2) and sodium hydroxide(NaOH) aqueous solution at room temperature.The products of Zn5(OH)8(Ac)2·2H2O and ZnO were prepared by controlling the pH values of the reaction system.The composition,structure,and morphology of the resultant soild were characterized by using X-ray diffraction,scanning electron microscopy and energy dispersive spectrometer.We found that when the pH value of the precursor solution was 7,a steady colloid could be synthesized by the precipitation method,and the composition of the product was Zn5(OH)8(Ac)2·2H2O after dried at room temperature.If the pH value was 14,the coagulation phenomenon occurred with the ageing of colloidal precursor,and the coagulation product was hexagonal flake ZnO.In addition,the growth mechanism of ZnO nanomaterials was discussed,and it was also considered from the effects of pH value on the stability of colloidal precursor.
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Key words:
- ZnO
- / room temperature
- / colloidal precursor
- / stability
- / flake nanomaterial
- / pH
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