Preparation and Photoluminescence of ZnO Comb-Like Structure and Nanorod Arrays
Preparation and Photoluminescence of ZnO Comb-Like Structure and Nanorod Arrays
复制标题
ZnO梳状结构和纳米棒阵列的制备及光致发光
DOI：
10.1088/1674-0068/20/03/308-314
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Qingtao Zhou
中科院分区：
文献类型：
--
作者：
Song Yin;Yiqing Chen;Yong Su;Qingtao Zhou
在无催化剂的条件下，采用热蒸发法在硅衬底上制备了大量的氧化锌（ZnO）梳状结构和高密度的ZnO纳米棒阵列。利用XRD、SEM、TEM和PL等手段对两种结构的形貌、生长机理和光学性能进行了研究。所得到的梳齿，直径约20 nm，沿沿着[0001]方向生长，与梳带具有明确的外延关系。ZnO纳米棒阵列的直径约为200 nm，长度可达几微米，大致垂直于Si衬底生长。在纳米棒生长之前获得ZnO薄膜。提出了一个生长模型来解释梳状锯齿状纳米结构的生长机制。在325 nm激发波长下的室温光致发光测试表明，ZnO梳状纳米结构在384 nm附近有较弱的紫外发射，在491 nm附近有较强的绿色发射，分别对应于近带边跃迁和单电离氧空位。相反，从ZnO纳米棒阵列获得了强而尖锐的紫外峰和弱的绿色峰。
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.