Growth and microstructure for visible emission and surface optical phonon mode of Zn–ZnO nanostructure (original) (raw)

2010, Philosophical Magazine

Recently, some nanomaterials with semiconducting, insulating and/or metallic properties have attracted much attention to fabricate nanoscaled electronic devices (i.e. channel of nanotransistors, cavity of nanolasers, and probe tips of atomic force microscopes (AFMs) [1]) because of their rod-like shape and compatibility with existing semiconductor processes. Keeping the above applications in mind, lots of new or modified materials have been developed. Because of the simple crystal structure (hexagonal), the low melting point of Zn and the high melting point of ZnO, they are very useful to fabricate Zn-ZnO nanostructure composites. As Zn and ZnO have a metallic (core) and insulating/semiconducting (islands) characteristics, respectively, they can be used to fabricate Zn-ZnO nanosized phosphors by a surface oxidation method. Further, ZnO has the tendency to form an epitaxial-orientation relationship with the Zn base crystal during oxidation. However, it is observed that ZnO is partially formed at the cost of Zn clusters. It is found that the relative cross-sectional area of Zn core and ZnO islands can be controlled by a suitable technique to enhance physical properties . Zn-ZnO nanophosphors are essential functional building blocks useful for fabricating nanoscaled electronic devices, since Zn enclosed by the ZnO can

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