Revisiting the St枚ber Method: Inhomogeneity in Silica Shells

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• 作者：Yi Jian Wong ; Liangfang Zhu ; Wei Shan Teo ; Yan Wen Tan ; Yanhui Yang ; Chuan Wang ; Hongyu Chen
• 刊名：Journal of the American Chemical Society
• 出版年：2011
• 出版时间：August 3, 2011
• 年：2011
• 卷：133
• 期：30
• 页码：11422-11425
• 全文大小：859K
• 年卷期：v.133,no.30(August 3, 2011)
• ISSN：1520-5126

文摘

We demonstrate that the silica shell on nanoparticles formed by a typical St枚ber method is inhomogeneous in nature. The outer layer of the shell is chemically more robust than the inner layer, which can be selectively etched by hot water. Methods are developed to 鈥渉arden鈥?the soft silica shells. These new understandings are exploited to develop versatile and template-free approaches for fabricating sophisticated yolk鈥搒hell nanostructures.