Using Elemental Se and Ag to Grow Pure Ag2Se Dendrites/Dendritic-Films of Highly Oriented (001) Nanocrystals
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- 作者：Dapeng Li ; Zhi Zheng ; Zhengyang Shui ; Mingqiang Long ; Jie Yu ; Ka Wai Wong ; Lin Yang ; Lizhi Zhang ; Woon Ming Lau
- 刊名：Journal of Physical Chemistry C
- 出版年：2008
- 出版时间：February 28, 2008
- 年：2008
- 卷：112
- 期：8
- 页码：2845 - 2850
- 全文大小：801K
- 年卷期：v.112,no.8(February 28, 2008)
- ISSN：1932-7455
文摘
A clean, facile route of using only common bulk selenium (Se) powder and silver (Ag) foil in a simplesolvothermal process is developed to synthesize a film of silver selenide (Ag2Se) dendrites of highly oriented(001) nanocrystals. The simple process takes ~10 h at 160 
C in a common alcohol such as methanol orethanol in an autoclave, and the reaction time is shorter than in many prevalent methods. The adoption ofelemental Se and Ag (foil) in the synthesis eases the control of the purity of the product, simplifies thereaction steps, and reduces the costs, as the synthesis does not require Se and Ag compounds, and also requiresno chemical additives other than an alcohol as solvent. The results support a mechanism of dissolution of thebulk-like Se powder in the solvothermal process, transport of solvated Se to react with Ag, nucleation ofAg2Se nanocrystals, surface-mediated, solvation-assisted surface diffusion of Ag2Se nanocrystals, and diffusion-limited aggregation of the Ag2Se nanocrystals through oriented attachment for the growth of dendrites havinghighly oriented (001) nanocrystals. The clean, relative facile route is practical for the fabrication of Ag2Secrystals/films with hierarchically ordered nanostructures for future applications in solar cell devices. Moreimportantly, the same concept can be adopted for the synthesis of other nanomaterials with bulk elementalreactants with no reliance on chemical compounds or additives.
C in a common alcohol such as methanol orethanol in an autoclave, and the reaction time is shorter than in many prevalent methods. The adoption ofelemental Se and Ag (foil) in the synthesis eases the control of the purity of the product, simplifies thereaction steps, and reduces the costs, as the synthesis does not require Se and Ag compounds, and also requiresno chemical additives other than an alcohol as solvent. The results support a mechanism of dissolution of thebulk-like Se powder in the solvothermal process, transport of solvated Se to react with Ag, nucleation ofAg2Se nanocrystals, surface-mediated, solvation-assisted surface diffusion of Ag2Se nanocrystals, and diffusion-limited aggregation of the Ag2Se nanocrystals through oriented attachment for the growth of dendrites havinghighly oriented (001) nanocrystals. The clean, relative facile route is practical for the fabrication of Ag2Secrystals/films with hierarchically ordered nanostructures for future applications in solar cell devices. Moreimportantly, the same concept can be adopted for the synthesis of other nanomaterials with bulk elementalreactants with no reliance on chemical compounds or additives.