Hierarchical ZnO with twinned structure: Morphology evolution, formation mechanism and properties
Hierarchical ZnO with twinned structure: Morphology evolution, formation mechanism and properties
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具有孪生结构的多级ZnO：形态演化、形成机制和性能
DOI：
10.1016/j.matchemphys.2015.02.020
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发表时间：
2015-04
影响因子：
4.6
通讯作者：
Ping Yang
中科院分区：
文献类型：
--
作者：
Ruixia Shi;Xueling Song;Jia Li;Ping Yang
采用柠檬酸三钠辅助水热法制备了多种由双晶结构构成的ZnO结构。提出并讨论了具有孪晶结构的ZnO层次化结构的可能形成机理。具有双晶结构的层次化氧化锌由两个半球组成，其中心凹结将它们在腰部连接在一起。当柠檬酸三钠浓度为0.1 m时，得到表面粗糙的ZnO微球，而当向水中加入甘油时，形成由六边形纳米片组成的足球状微球，这可能是纳米晶体成核和生长速度较慢的原因。在简单调节柠檬酸三钠浓度的情况下，由于初始核和生长单元的数量不同，生成了具有不同长径比的汉堡状ZnO和不均匀的ZnO微球。足球状ZnO的表面积约为不规则颗粒组成的微球的3.51倍。然而，在紫外光照射下，它们的光催化性能相似，这表明样品的孔径大小对光催化活性的影响更为重要。
Various hierarchical ZnO architectures constructed by twinned structures have been synthesized via a trisodium citrate assisted hydrothermal method on a large scale. The probable formation mechanisms of hierarchical ZnO structures with twinned structure were proposed and discussed. The hierarchical ZnO with twinned structures are composed of two hemispheres with a center concave junction to join them together at their waists. The ZnO microspheres with rough surfaces were obtained when the concentration of trisodium citrate is 0.1 M. However, the football-like microspheres consisted of hexagonal nanosheets were formed when adding glycerol into the water, which should be attributed to the slower nucleation and growth rate of nanocrystals. The hamburger-like ZnO with different aspect ratio and nonuniform ZnO microspheres were generated due to the different quantity of initial nuclei and growth units when simply modulating the concentration of trisodium citrate. The surface area of football-like ZnO is about 3.51 times of microspheres composed of irregular particles. However their photocatalytic performances are similar under UV light irradiation, which indicates that pore sizes of the sample have more important influences on the photocatalytic activity.
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