Formation and conversion mechanisms between single-crystal gamma-MnOOH and manganese oxides

被引：39
作者：
Wei, Chunguang [1 ,2 ]
Xu, Chengjun [1 ]
Li, Baohua [1 ]
Nan, Ding [2 ]
Ma, Jun [1 ]
Kang, Feiyu [1 ,2 ]
机构：
[1] Tsinghua Univ, Adv Mat Inst, Grad Sch Shenzhen, Shenzhen 518055, Guangdong, Peoples R China
[2] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
来源：
MATERIALS RESEARCH BULLETIN | 2012年 / 47卷 / 07期
基金：
中国博士后科学基金;
关键词：
Nanostructures; Oxides; Crystal growth; Electron microscopy; Crystal structure; TEMPERATURE HYDROTHERMAL SYNTHESIS; BETA-MNO2; NANORODS; NANOWIRES; GROWTH;
D O I：
10.1016/j.materresbull.2012.03.041
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Formation and conversion mechanisms between single-crystal gamma-MnOOH and manganese oxides had investigated systematically. Without extra surfactant or template, alpha-MnO2 nanorods and prismatic single crystalline gamma-MnOOH rods had been synthesized under hydrothermal treatment in this study. The formation and conversion mechanisms of prismatic gamma-MnOOH rod were investigated by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). It was found that the formation process includes three evolution stages: (1) formation of alpha-MnO2 nanorods whiskers; (2) transformation from alpha-MnO2 nanorods to prismatic gamma-MnOOH rods by a dissolution-growth-recrystallization process; and (3) preferred growth on (1 1 (1) over bar) crystal plane. In addition, beta-MnO2, Mn2O3 or Mn3O4 rods could be obtained by calcination of the gamma-MnOOH rods at different temperatures, which indicated that gamma-MnOOH is an important precursor for preparing manganese oxides. The morphology and dimension of gamma-MnOOH rods remained unchanged after converted to beta-MnO2, Mn2O3 and Mn3O4. (C) 2012 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1740 / 1746
页数：7
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