Seed layer-free electrodeposition and characterization of vertically aligned ZnO nanorod array film
Seed layer-free electrodeposition and characterization of vertically aligned ZnO nanorod array film
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DOI：
10.1007/s10008-009-0785-6
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发表时间：
2009
影响因子：
2.5
通讯作者：
Feng Xu;Yi-nong Lu;Yan Xie;Yunfei Liu
中科院分区：
文献类型：
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作者：
Feng Xu;Yi-nong Lu;Yan Xie;Yunfei Liu
采用六亚甲基四胺(HMT)辅助电沉积的方法，在ITO玻璃上快速制备了垂直排列的氧化锌纳米棒阵列(ZNR)，而不需要预制的氧化锌种子层。通过循环伏安曲线和电流-时间曲线研究了HMT对ZNR电沉积过程的影响。提出了基于HMT-4H覆盖效应的电沉积生长模型。透射电子显微镜和粉末X射线衍射仪表明，合成的ZNRs为单晶纤锌矿结构，沿[0001]方向有明显的择优生长。与没有HMT辅助的电沉积氧化锌薄膜相比，ZNR阵列在可见光波段具有较高的透过率(90%)，并且禁带能量蓝移。此外，在拉曼光谱中，在437.3 cm−处存在光学声子E2(高)，在376 nm处有较强的紫外光发射，但在室温光致发光光谱中与缺陷相关的深能级发射很弱，这也表明该阵列具有良好的晶体质量。更重要的是，ZNRs的快速合成为后续的电化学溶解过程在较短的时间内制备氧化锌纳米管提供了可行性。
Vertically aligned arrays of ZnO nanorod (ZNR) were rapidly synthesized on ITO glass without needing a pre-prepared seed layer of ZnO via a hexamethylenetetramine (HMT)-assisted electrodeposition route. The effect of HMT on the ZNR electrodeposition process was investigated by the cyclic voltammetric curve and the current–time curve. An electrodeposition growth model based on the capping effect of HMT–4H was proposed. The as-synthesized ZNRs possess single crystalline, a wurtzite crystal structure with markedly preferential growth orientation along [0001] direction determined by transmission electron microscopy and powder X-ray diffraction. As compared with the electrodeposited ZnO film without HMT assistance, the ZNR arrays showed the high transmittance (90%) in the visible wavelength range and the blue-shift of the band gap energy. Moreover, the presence of an optical-phonon E2(high) at 437.3 cm−1in Raman spectrum and strong ultraviolet emission at 376 nm but weak defect-related deep level emission in the room temperature photoluminescence spectrum also indicated that such ZNR arrays are of good crystal quality. More importantly, the rapid synthesis of ZNRs could provide the feasibility for preparation of ZnO nanotubes within a shorter time by a subsequent electrochemical dissolution process.