纳米结构ZnO在TiO_2薄膜上的电化学沉积及其表征  

Electrochemical deposition of nano-structured ZnO on the nanocrystalline TiO_2 film and its characterization

作　　者：林景升[1,2] 付薇 井立强[1,2] 屈宜春[1,2] 李志君[1,2] 

机构地区：[1]功能无机材料化学教育部重点实验室 [2]黑龙江大学化学化工与材料学院,哈尔滨150080

出　　处：《中国科学：化学》2010年第10期1509-1514,共6页SCIENTIA SINICA Chimica

基　　金：教育部新世纪优秀人才支持计划(NCET-070259),教育部科学技术研究重点项目(207027);黑龙江省杰出青年科学基金(JC200701)资助

摘　　要：在三电极体系中,以硝酸锌水溶液作为电解液,采用阴极还原电沉积法成功实现了一维纳米结构ZnO阵列在TiO2纳米粒子/ITO导电玻璃薄膜基底上的沉积,并通过XRD、SEM、EDS和PL光谱等方法对样品进行了表征.重点研究了薄膜基底、电解液浓度、沉积时间、六次亚甲基四胺(HMT)的引入对ZnO沉积及其发光性质的影响.结果显示:与ITO玻璃基底相比,ZnO更易于在TiO2纳米粒子薄膜上实现电化学沉积.ZnO属于六方晶系的铅锌矿结构,并且沿着c-轴方向表现出明显的择优化生长,以形成垂直于基底的ZnO纳米棒阵列.延长沉积时间、增加电解液浓度和引入一定量的HMT等均对ZnO的生长有促进作用,进而使其纳米棒的结晶度和取向程度提高,进而解释了所得的薄膜分别约在375和520nm处表现出ZnO的强而窄的带边紫外光发射峰和弱而宽的表面态绿光发射带.One-dimensional structure of ZnO nanorod arrays on nanocrystalline TiO2/ITO conductive glass substrates have been fabricated by cathodic reduction electrochemical deposition methods in the three-electrode system,with zinc nitrate aqueous solution as the electrolyte,and were characterized by X-ray diffraction （XRD）,scanning electron microscopy （SEM）,energy-dispersive X-ray （EDX） and photoluminescence （PL） spectra. The effects of film substrates,electrolyte concentration,deposition time,and methenamine （HMT） addition on ZnO deposition and its luminescent property were investigated in detail. The results show that,compared with on the ITO glass substrate,ZnO is much easily achieved by electrochemical deposition on the TiO2 nanoparticle thin films. ZnO is hexagonally structured wurtzite with the c-axis preferred growth,and further forms nanorod arrays vertically on the substrates. It is favorable to the growth of ZnO to extend the deposition time,to increase the electrolyte concentration,and to add a certain amount of HMT in the system,consequently improving the crystallinity and orientation of ZnO arrays. It is demonstrated that the obtained ZnO arrays with high crystallinity and good orientation display strong band-edge UV （375 nm） and weak surface-state-related green （520 nm） emission peaks.

关 键 词：氧化锌 纳米棒阵列 电化学沉积 二氧化钛纳米薄膜 光致发光 

分 类 号：TB383.1[一般工业技术—材料科学与工程]