Catalytic synthesis and structural characteristics of high-quality tetrapod-like ZnO nanocrystals by a modified vapor transport process
Catalytic synthesis and structural characteristics of high-quality tetrapod-like ZnO nanocrystals by a modified vapor transport process
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DOI：
10.1021/cg049973r
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发表时间：
2005
影响因子：
3.8
通讯作者：
Wei-dong Yu;Xiaomin Li;Xiangdong Gao
中科院分区：
文献类型：
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作者：
Wei-dong Yu;Xiaomin Li;Xiangdong Gao
采用改进的气相传输法合成了高质量的四脚状ZnO（T-ZnO）纳米晶。在Si衬底上制备了NiO纳米晶作为催化剂。通过碳热还原碳酸锌产生高产量的锌蒸气来促进T-ZnO纳米晶的合成。所生长的T-ZnO纳米晶体由四个六方棱柱形纳米棒组装而成，其直径和长度分别为80 - 100和600 - 1000 nm。在T-ZnO纳米棒的中心，发现了一个四面体的核心和一些不规则的补丁之间的纳米棒。总体上，T-ZnO纳米晶沿ZnO的方向沿着择优排列。T-ZnO纳米晶的光致发光光谱显示出两个发射带，在390 nm附近有较强的紫外发射，在440 nm附近有较弱的蓝光发射。不能区分与ZnO晶体中缺陷的存在有关的绿色光发射。这意味着T-ZnO纳米晶具有高的晶体完整性。
High-quality tetrapod-like ZnO (T-ZnO) nanocrystals were synthesized by a modified vapor transport process. NiO nanocrystals were prepared on a Si substrate as a catalyst. High-yield zinc vapor was produced by a carbothermal reduction of zinc carbonate to promote the synthesis of T-ZnO nanocrystals. The as-grown T-ZnO nanocrystals are assembled by four hexagonal prismatic nanorods, whose diameters and lengths are 80−100 and 600−1000 nm, respectively. In the center of a T-ZnO nanocrystal, a tetrahedral core and several irregular patches were found among the nanorods. As a whole, T-ZnO nanocrystals are preferentially arranged along the 〈001〉 direction of ZnO. The photoluminescence spectrum of T-ZnO nanocrystals showed two emission bands, a strong ultraviolet emission at around 390 nm and a weak blue emission at 440 nm. The green light emission that is related to the existence of the defects in ZnO crystals cannot be distinguished. It implies that the high crystal integrity of T-ZnO nanocrystals has been obt...