Synthesis and morphology control of ZnO nanostructures in microemulsions
Synthesis and morphology control of ZnO nanostructures in microemulsions
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微乳液中ZnO纳米结构的合成与形貌控制
DOI：
10.1016/j.jcis.2009.02.029
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发表时间：
2009-05-15
影响因子：
9.9
通讯作者：
Wang, Mei
中科院分区：
文献类型：
--
作者：
Li, Xiangcun;He, Gaohong;Wang, Mei
以PEG 400为导向剂，采用简单的微乳液法制备了不同形貌和光学性质的ZnO纳米结构。采用TEM、XRD、FTIR、TG-DTA等手段对样品进行了表征。XRD分析表明，ZnO晶体为六方纤锌矿结构。在Zn（NO3）2溶液中，随着PEG 400浓度的增加，分别合成了针状、柱状和球形ZnO样品。TEM图像和热重分析表明，微乳液界面和PEG 400剂对ZnO纳米结构的形貌和晶粒尺寸转变具有协同作用。通过室温下的紫外-可见吸收光谱研究了样品的光学性质。所有样品在365 nm附近都表现出较强的紫外吸收。ZnO产品的带隙能量为3.06。在Zn（NO3）（2）溶液中，0、12.5、25.0和50.0%PEG 400分别获得3.02、2.95和2.85 eV。提出了ZnO纳米结构的形成机理并进行了详细的讨论。本文报道的微乳液界面和试剂对晶核生长的协同控制为制备其他定义明确的纳米结构提供了另一种方法。(C)2009 Elsevier Inc. All rights reserved.
ZnO nanostructures with different morphologies and optical properties were prepared by a simple microemulsion process, and PEG400 Was used as a directing agent. The samples were characterized by TEM, XRD, FTIR, and TG-DTA analysis. The XRD spectra indicate that the ZnO crystal has a hexagonal wurtzite structure. Needle-like, Columnar, and spherical ZnO samples were synthesized respectively with the increase of PEG400 concentration in Zn(NO3)(2) solution. TEM images and thermogravimetric analysis reveal that the microemulsion interface and the PEG400 agent have a synergistic effect on the morphology and crystalline size transition of ZnO nanostructures. The optical properties of the samples were investigated by measuring the UV-Vis absorbance spectra at room temperature. All the samples exhibit strong UV absorption at around 365 nm. ZnO products with band gap energies at 3.06. 3.02, 2.95, and 2.85 eV were obtained with 0, 12.5, 25.0, and 50.0% of PEG400 in Zn(NO3)(2) Solution, respectively. The formation mechanism of the ZnO nanostructures was proposed and discussed in detail. The synergistic control of the microemulsion interface and the agent on the growth of crystal nuclei reported here provides an alternative approach for preparation of other well-defined nanostructures. (C) 2009 Elsevier Inc. All rights reserved.