Zn基柱状ZnO取向生长机制  

Alignment Growth Mechanisms of Rod-like ZnO on Zinc Substrates

作　　者：刘长友[1] 王金芳[1] 孙晓燕[1] 王泽温[2] 介万奇[1] 

机构地区：[1]西北工业大学材料学院凝固技术国家重点实验室,西安710072 [2]西安理工大学材料学院,西安710032

出　　处：《无机材料学报》2013年第3期301-306,共6页Journal of Inorganic Materials

基　　金：凝固技术国家重点实验室自主课题(74-QP-2011);西北工业大学基础研究基金(JC20110247);陕西省教育厅科学研究项目(2010JK760)~~

摘　　要：通过预氧化处理在Zn基底上制备了ZnO颗粒膜,并由N2H4.H2O-水热体系制备了Zn基柱状ZnO阵列。实验发现,在Zn单一晶体学取向表面上柱状ZnO高度有序排列,据此提出了Zn基柱状ZnO的自由生长取向机制。水热反应条件下,ZnO微晶通常具有沿c轴优先生长的结晶习性,柱状体高度有序排列取决于ZnO晶核的状态。单一晶体学取向表面上晶核的状态一致,决定了ZnO柱状体取向一致。Zn基柱状ZnO阵列光致发光谱分析表明,在30～60 K之间,近带边激子发射峰强度呈现反常温度依赖的"负热淬灭"现象,该过程包含了两个无辐射过程和一个负热淬灭过程。Discontinuous films of ZnO particles were prepared on zinc substrates by air pre-oxidation process. The arrays of rod-like ZnO nano-/microcrystals on zinc substrates were synthesized through hydrothermal processing with N2H4.H20 solution. It is found that the rod-like ZnO nano-/micro-crystals align well on the substrate surface with a unique crystallographic orientation. The experimental results suggest a free alignment growth mechanism for rod-like ZnO nano-/micro-crystals on zinc substrates. The crystallization habit of ZnO nano-/micro-crystals is to grow along with the c axis fast under hydrothermal conditions, thus the well alignment of rod-like ZnO nano-/micro-crystals only depends on the state of ZnO nuclei on the substrate surface. The states of ZnO nuclei on the substrate surface with a unique crystallographic orientation well agree with others, which regulates the alignment of rod-like ZnO nano-/micro-crystals. In temperature-dependent photoluminescence spectra, the ＂negative thermal quenching＂ phenomenon of near band-gap edge excitons is observed in the temperature ranging from 30 K to 60 K, which identify two non-radiative processes and one negative thermal quenching process.

关 键 词：氧化锌 锌基底 取向生长机理 光致发光 

分 类 号：O611[理学—无机化学]