煅烧
纤锌矿晶体结构
材料科学
硝酸锌
扫描电子显微镜
降水
锌
化学工程
粒径
差热分析
热重分析
热分析
热分解
纳米颗粒
核化学
冶金
纳米技术
衍射
热的
化学
复合材料
有机化学
催化作用
物理
气象学
工程类
光学
作者
Changchun Chen,Ping Liu,Chunhua Lu
标识
DOI:10.1016/j.cej.2008.07.047
摘要
In this study, the precursor precipitates of Zinc oxide (ZnO) were obtained by a direct precipitation method via the reaction between Zinc nitrate (Zn(NO3)2) and Ammonium carbonate ((NH4)2CO3) in aqueous solutions with proper concentration. X-ray diffraction (XRD) analysis demonstrated that the precursor precipitates of ZnO were Zn4(CO3)(OH)6·H2O. Both the Differential thermal analysis (DTA) and the thermal gravimetric analysis (TGA) curves of the precursor precipitates show that no further weight loss and thermal effect were observed at a temperature of above 550 °C. The precursor precipitates of ZnO were subjected to thermal calcinations and finally yielded the nano-sized ZnO powders. The calcined ZnO powders were characterized by XRD, Brunauer–Emmet–Teller analysis (BET), and scanning electron microscope (SEM), respectively. The XRD results indicated that the synthesized ZnO powders had a pure wurtzite structure and the average nano-particle sizes were about 35.2 nm. However, the inconsistency of ZnO particle sizes derived from the BET methods and the XRD analysis indicated that a fraction of nano-sized ZnO powders were in the form of aggregates, which was also verified by SEM and TEM image. In addition, both the SEM image and the TEM photograph demonstrated that the nano-sized ZnO particles were of a pseudo-spherical shape.
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