Using a Macroporous Silver Shell to Coat Sulfonic Acid Group-Functionalized Silica Spheres and Their Applications in Catalysis and Surface-Enhanced Raman Scattering

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• 作者：Guohong Ren ; Wenqin Wang ; Mengying Shang ; Hanzhi Zou ; Shengwei Cheng
• 刊名：Langmuir
• 出版年：2015
• 出版时间：September 29, 2015
• 年：2015
• 卷：31
• 期：38
• 页码：10517-10523
• 全文大小：492K
• ISSN：1520-5827

文摘

In this paper, novel organic sulfonic acid group-functionalized silica spheres (SiO₂鈥揝O₃H) were chosen as a template for fabricating core鈥搒hell SiO₂鈥揝O₃H@Ag composite spheres by the seed-mediated growth method. The SiO₂鈥揝O₃H spheres could be obtained easily by oxidation of the thiol group-terminated silica spheres (SiO₂鈥揝H) with H₂O₂. Due to the presence of sulfonic acid groups, the [Ag(NH₃)₂]⁺ ions were captured on the surface of the silica spheres, followed by in-site reduction to silver nanoseeds for further growth of the silver shell. By this strategy, the complete silver shell could be obtained, and the surface morphologies and structures of the silver shell could be controlled by adjusting the number of sulfonic acid groups on the silica spheres. A large number of sulfonic acid groups on the SiO₂鈥揝O₃H spheres favored the formation of the macroporous silver shell, which was unique and exhibited good catalytic performance and a high surface-enhanced Raman scattering (SERS) enhancement ability.