Synthesis of vertically aligned ultra-long ZnO nanowires on heterogeneous substrates with catalyst at the root

被引:79
作者
Zhu, Guang [1 ]
Zhou, Yusheng [1 ]
Wang, Sihong [1 ]
Yang, Rusen [2 ]
Ding, Yong [1 ]
Wang, Xue [1 ,3 ]
Bando, Yoshio [4 ]
Wang, Zhong Lin [1 ]
机构
[1] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA
[2] Univ Minnesota, Dept Mech Engn, Minneapolis, MN 55455 USA
[3] Chongqing Univ, Dept Appl Phys, Chongqing 400044, Peoples R China
[4] Natl Inst Mat Sci, World Premier Int Ctr Mat Nanoarchitecton MANA, Tsukuba, Ibaraki 305004, Japan
关键词
ZINC-OXIDE NANOWIRES; PATTERNED GROWTH; TEMPERATURE; ARRAYS; MECHANISM; NANOBELTS; EMISSION;
D O I
10.1088/0957-4484/23/5/055604
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The synthesis of ultra-long high-quality ZnO nanowires with uniform size and orientation on heterogeneous substrates is highly desirable, not only for investigating the fundamental properties of ZnO nanowires, but also for fabricating integrated functional nanodevices. Here we present a novel and general technique for growing vertically aligned ultra-long ZnO nanowires on various substrates. More importantly, the metal catalyst is experimentally determined not at the tip ends of the nanowires but at the junction area between the nanowires and the underlying substrate. Based on detailed analysis and control group results, we then propose a three-stage growth mechanism, in which vapor-liquid-solid growth and vapor-solid growth compete with each other to become dominant.
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页数:6
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