Using a Macroporous Silver Shell to Coat Sulfonic Acid Group-Functionalized Silica Spheres and Their Applications in Catalysis and Surface-Enhanced Raman Scattering.
In this paper, novel organic sulfonic acid group-functionalized silica spheres (SiO2-SO3H) were chosen as a template for fabricating core-shell SiO2-SO3H@Ag composite spheres by the seed-mediated growth method. The SiO2-SO3H spheres could be obtained easily by oxidation of the thiol group-terminated silica spheres (SiO2-SH) 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-SO3H 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.
Department of Polymer Science and Engineering, Faculty of Materials Science and Chemical Engineering, Ningbo University , Ningbo 315211, PR China.
Guohong
G
Ren
Department of Polymer Science and Engineering, Faculty of Materials Science and Chemical Engineering, Ningbo University , Ningbo 315211, PR China.
Wenqin
W
Wang
Department of Polymer Science and Engineering, Faculty of Materials Science and Chemical Engineering, Ningbo University , Ningbo 315211, PR China.
Mengying
M
Shang
Department of Polymer Science and Engineering, Faculty of Materials Science and Chemical Engineering, Ningbo University , Ningbo 315211, PR China.
Hanzhi
H
Zou
Department of Polymer Science and Engineering, Faculty of Materials Science and Chemical Engineering, Ningbo University , Ningbo 315211, PR China.
Shengwei
S
Cheng
D002384:Catalysis; D008863:Microspheres; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013451:Sulfonic Acids / Q000737:chemistry*; D013499:Surface Properties
D013451:Sulfonic Acids; D012834:Silver; D012822:Silicon Dioxide