Photoluminescence and field emission of 1D ZnO nanorods fabricated by thermal evaporation

Photoluminescence and field emission of 1D ZnO nanorods fabricated by thermal evaporation
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热蒸发制备一维氧化锌纳米棒的光致发光和场发射

DOI:
10.1007/s00339-012-6870-1
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发表时间:
2012-03
期刊:
Applied Physics A: Materials Science and Processing
影响因子:
--
通讯作者:
Xu, P.
Xu, P.
中科院分区:
其他
文献类型:
--
作者:
Wang, B.;Jin, X.;Ouyang, Z. B.;Xu, P.

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采用Au催化剂辅助热蒸发ZnO和活性炭粉末的方法,在单晶硅衬底上生长了四种新型的一维ZnO纳米结构:芹菜状纳米棒、针状纳米棒、扭曲折叠状纳米棒和锥形纳米棒。利用场发射扫描电子显微镜(FESEM)和X射线衍射仪(XRD)对所制备的纳米棒的形貌和结构进行了表征。光致发光谱(PL)分析指出,紫外发射带是带间发射峰,可见光区的发射带是由氧空位、Zn晶体或杂质引起的。研究了四种ZnO纳米棒的场发射特性,其中锥形ZnO纳米棒由于其尖端发射极半径在纳米尺度上最小,具有较好的场发射特性。ZnO纳米棒的生长机理可以用气-液-固(VLS)过程来解释。
Four kinds of new one-dimensional nanostructures, celery-shaped nanorods, needle-shaped nanorods, twist fold-shaped nanorods, and awl-shaped nanorods of ZnO, have been grown on single silicon substrates by an Au catalyst assisted thermal evaporation of ZnO and active carbon powders. The morphology and structure of the prepared nanorods are determined on the basis of field-emission scanning electron microscopy (FESEM) and x-ray diffraction (XRD). The photoluminescence spectra (PL) analysis noted that UV emission band is the band-to-band emission peak and the emission bands in the visible range are attributed to the oxygen vacancies, Zn interstitials, or impurities. The field-emission properties of four kinds of ZnO nanorods have been invested and the awl-shaped nanorods of ZnO have preferable characteristics due to the smallest emitter radius on the nanoscale in the tip in comparison with other nanorods. The growth mechanism of the ZnO nanorods can be explained on the basis of the vapor–liquid–solid (VLS) processes.
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