Evolution of space-efficient and facet-specific ZnO 3-D nanostructures and their application in photocatalysis
- Authors
- Kim, Seewon; Kim, Minsik; Kim, Taekhoon; Baik, Hionsuck; Lee, Kwangyeol
- Issue Date
- 2013
- Publisher
- ROYAL SOC CHEMISTRY
- Citation
- CRYSTENGCOMM, v.15, no.14, pp.2601 - 2607
- Indexed
- SCIE
SCOPUS
- Journal Title
- CRYSTENGCOMM
- Volume
- 15
- Number
- 14
- Start Page
- 2601
- End Page
- 2607
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/106581
- DOI
- 10.1039/c2ce26557e
- ISSN
- 1466-8033
- Abstract
- We report new structural designs to dramatically increase the surface area of the ZnO nanostructure without compromising the small volume much. Space-efficient and facet-specific ZnO 3-D nanostructures, namely {10 (1) over bar1}-stacked nanocones and {10 (1) over bar0}-nanoforest, have been prepared by facet-selective etching and oriented nanocrystal growth, respectively. Grain boundary etching of multiwalled ZnO hexagonal nanocones leads to polar {10 (1) over bar1} facet-maximized ZnO stacked nanocones and oriented nanocolumn growth on ZnO hexagonal nanocones generates {10 (1) over bar0} facet maximized ZnO nanoforests. These facet-specific ZnO nanostructures offer opportunities for examination of their facet-dependent photocatalytic properties. Compared to the original ZnO hexagonal nanocone structures, these new ZnO 3-D structures exhibit a much higher photocatalytic property for photodegradation of organic dye, rhodamine B. Specifically, {10 (1) over bar1} stacked nanocones with a polar {10 (1) over bar1} plane maximized structure and high density of oxygen vacancies have shown the best performance among structures examined. We also demonstrate a great photocatalytic performance of the Au supported 3-D ZnO nanostructures with well-defined facets and high surface area.
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