Fabrication and Luminescent Properties of c-Axis Oriented ZnO-ZnS Core-Shell and ZnS Nanorod Arrays by Sulfidation of Aligned ZnO Nanorod Arrays
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- 作者：Subhendu K. Panda ; Apurba Dev ; Subhadra Chaudhuri
- 刊名：Journal of Physical Chemistry C
- 出版年：2007
- 出版时间：April 5, 2007
- 年：2007
- 卷：111
- 期：13
- 页码：5039 - 5043
- 全文大小：384K
- 年卷期：v.111,no.13(April 5, 2007)
- ISSN：1932-7455
文摘
In this paper, we report the preparation of vertically aligned ZnO-ZnS core-shell and ZnS nanorod arrayswith crystallographic orientation along the c-axis by sulfidation of aligned ZnO nanorod arrays. The ZnOnanorod arrays were prepared by a surfactant assisted soft chemical method on a sol-gel derived ZnO thinfilm. Partial conversion of the ZnO nanorod surface to ZnS at 400 
C in an H2S and argon gas mixtureproduces ZnO-ZnS core-shell structures, whereas the complete conversion at 600 C produces well-alignedZnS nanorods. The influence of the sulfidation time and annealing temperature on the conversion of ZnOnanorods to ZnO-ZnS core-shell nanorods is investigated. TEM studies revealed that the sulfidation processbegins at the surface of the ZnO nanorods, which gradually increase inward, retaining the morphology andfollowing the crystal orientation of the ZnO core. The nanostructures showed enhanced UV emission properties.The described procedures open a way to convert a microstructured material into chemically more stablematerials with the same morphology, thus leading to a diversification of possible applications.
C in an H2S and argon gas mixtureproduces ZnO-ZnS core-shell structures, whereas the complete conversion at 600 C produces well-alignedZnS nanorods. The influence of the sulfidation time and annealing temperature on the conversion of ZnOnanorods to ZnO-ZnS core-shell nanorods is investigated. TEM studies revealed that the sulfidation processbegins at the surface of the ZnO nanorods, which gradually increase inward, retaining the morphology andfollowing the crystal orientation of the ZnO core. The nanostructures showed enhanced UV emission properties.The described procedures open a way to convert a microstructured material into chemically more stablematerials with the same morphology, thus leading to a diversification of possible applications.