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Preparation and Photoluminescence of ZnO Comb-Like Structure and Nanorod Arrays
Song Yin,Yi-qing Chen*,Yong Su,Qing-tao Zhou
Author NameAffiliationE-mail
Song Yin School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China  
Yi-qing Chen* School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China chenyq63@126.com 
Yong Su School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China  
Qing-tao Zhou School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China  
Abstract:
A large quantity of Zinc oxide (ZnO) comb-like structure and high-density well-aligned ZnO nanorod arrays were prepared on silicon substrate via thermal evaporation process without any catalyst. The morphology, growth mechanism, and optical properties of the both structures were investigated using XRD, SEM, TEM and PL. The resulting comb-teeth, with a diameter about 20 nm, growing along the [0001] direction have a well-defined epitaxial relationship with the comb ribbon. The ZnO nanorod arrays have a diameter about 200 nm and length up to several micrometers growing approximately vertical to the Si substrate. A ZnO film was obtained before the nanorods growth. A growth model is proposed for interpreting the growth mechanism of comb-like zigzag-notch nanostructure. Room temperature photoluminescence measurements under excitation wavelength of 325 nm showed that the ZnO comb-like nanostructure has a weak UV emission at around 384 nm and a strong green emission around 491 nm, which correspond to a near band-edge transition and the singly ionized oxygen vacancy, respectively. In contrast, a strong and sharp UV peak and a weak green peak was obtained from the ZnO nanorod arrays.
Key words:  ZnO nanostructure, Vapor-Solid mechanism, Epitaxial growth, Photoluminescence
FundProject:
ZnO纳米带外延树枝状锯齿形缺口结构的制备及其发光特性
尹松,陈翌庆*,苏勇,周庆涛
摘要:
应用气固生长方式在没有催化剂的情况下合成出一种新奇的ZnO纳米结构.通过透射电子显微镜分析,发现这种ZnO纳米带外延晶枝直径约20 nm,在[0001]方向有着良好的外延生长取向.提出了一个模型来解释这种树枝状锯齿结构的生长.室温下光致发光测量表明这种ZnO纳米结构在382、491 nm处有一个紫外发光峰和绿光发光峰.
关键词:  ZnO纳米结构,气-固机制,外延生长,光致发光
DOI:10.1088/1674-0068/20/03/308-314
分类号: