Synthesis and thermal stability of ZnO nanowires

被引：22
|
作者：
Awad, Madeha Ahmed [1 ]
Ibrahim, Eslam Mohamed Mohamed [1 ]
Ahmed, Mohamed [1 ]
机构：
[1] Sohag Univ, Dept Phys, Fac Sci, Sohag 82524, Egypt
来源：
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY | 2014年 / 117卷 / 02期
关键词：
ZnO NWs; Vapor transport; Annealing; Thermal stability; ZINC-OXIDE; GROWTH-MECHANISM; TEMPERATURE; NANOPARTICLES; ENHANCEMENT;
D O I：
10.1007/s10973-014-3836-x
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
ZnO nanowires (NWs) were synthesized on Au-coated Si (100) substrates by vapor transport method. The effect of high temperature annealing on the structural and chemical composition as well as thermal stability was studied. The as-prepared ZnO NWs was nearly stoichiometric and identified as hexagonal ZnO phase. After annealing at 1,473 K, the atomic ratio of O/Zn, the intensity of the diffraction peaks, and the diameter of nanowires were increased. The ZnO NWs were fragmented into nanocrystals and the fragments coalesced with each other after annealing at 1,673 K. The thermal stability of ZnO NWs was studied by thermo-gravimetric (TG) analysis. A sharp increase in the TG curves was observed and can be attributed to the oxidation of some possibly presented Zn atoms. The activation energy of oxidation of Zn interstitial atoms was found to be 484.81 kJ mol(-1). A mass gain peak was observed after annealing at 1,473 K, but it was completely eliminated after annealing at 1,673 K.
引用
收藏
页码：635 / 642
页数：8
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