title: A novel and universal route to SiO2-supported organic/inorganic hybrid noble metal nanomaterials via surface RAFT polymerization.
abstract: Polymer-encapsulated gold or silver nanoparticles were synthesized and sterically stabilized by a shell layer of poly(4-vinylpyridine) (P4VP) grafted on SiO(2) nanoparticles that acts as a scaffold for the synthesis of hybrid noble metal nanomaterials. The grafting P4VP shell was synthesized via surface reversible addition-fragmentation chain transfer (RAFT) polymerization of 4-vinylpyridine (4VP) using SiO(2)-supported benzyl 9H-carbazole-9-carbodithioate (SiO(2)-BCBD) as the RAFT agent. The covalently tethered P4VP shell can coordinate with various transition metal ions such as Au(3+) or Ag(+) and therefore stabilize the corresponding Au or Ag nanoparticles reduced in situ by sodium borohydride (NaBH(4)) or trisodium citrate. The SiO(2)-supported RAFT agent and the Au or Ag nanoparticles embedded in the P4VP shell layer were characterized by UV-vis spectrophotometer, X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and surface-enhanced Raman spectroscopy (SERS).
authors.affiliation: Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
authors.forename: Jiliang
authors.initials: J
authors.lastname: Liu
authors.forename: Lifen
authors.initials: L
authors.lastname: Zhang
authors.forename: Suping
authors.initials: S
authors.lastname: Shi
authors.forename: Shuai
authors.initials: S
authors.lastname: Chen
authors.forename: Nianchen
authors.initials: N
authors.lastname: Zhou
authors.forename: Zhengbiao
authors.initials: Z
authors.lastname: Zhang
authors.forename: Zhenping
authors.initials: Z
authors.lastname: Cheng
authors.forename: Xiulin
authors.initials: X
authors.lastname: Zhu