From Layered Double Hydroxides to ZnO-based Mixed Metal Oxides by Thermal Decomposition: Transformation Mechanism and UV-Blocking Properties of the Product
From Layered Double Hydroxides to ZnO-based Mixed Metal Oxides by Thermal Decomposition: Transformation Mechanism and UV-Blocking Properties of the Product
复制标题
DOI：
10.1021/cm100383d
复制
发表时间：
2010-06
影响因子：
8.6
通讯作者：
Xiaofei Zhao;Fazhi Zhang;Sailong Xu;D. Evans;X. Duan
中科院分区：
文献类型：
--
作者：
Xiaofei Zhao;Fazhi Zhang;Sailong Xu;D. Evans;X. Duan
层状双氢氧化物热分解是制备由金属氧化物和尖晶石相组成的混合金属氧化物纳米复合材料的一种方法。详细了解LDH前体转化为MMO的机制，可以使所得到的MMO纳米复合材料的性能适应特定的应用。本文系统地研究了不同温度下ZnO- ZnAl2O4纳米复合材料的结构、组成和形貌演变。采用高分辨率透射电子显微镜（HRTEM）、选择区域电子衍射（SAED）、原位x射线衍射（XRD）、固态27Al魔角自旋核磁共振（27Al MAS NMR）、热重和差热分析（TG - DTA）等手段对ZnO晶的成核、取向生长和ZnAl2O4的形成进行了监测。LDH的层状结构…
Thermal decomposition of layered double hydroxides (LDHs) is a way of fabricating mixed metal oxide (MMO) nanocomposite materials composed of metal oxide and spinel phases. A detailed understanding of the mechanism of the transformation of the LDH precursor to the MMO should allow the properties of the resulting MMO nanocomposites to be tailored to specific applications. Here we report a systematic investigation of the structure, composition, and morphology evolution from ZnAl-LDHs to ZnO-based MMO nanocomposites composed of ZnO and ZnAl2O4 on calcination at different temperatures. The nucleation and oriented growth of ZnO crystallites and the formation of ZnAl2O4 were monitored by high resolution transmission electron microscopy (HRTEM) combined with selected-area electron diffraction (SAED), in situ X-ray diffraction (XRD), solid-state 27Al magic-angle spinning nuclear magnetic resonance (27Al MAS NMR), and thermogravimetric and differential thermal analyses (TG−DTA). The layered structure of the LDH pr...