title: Interfacial entrapment of noble metal nanoparticles and nanorods capped with amphiphilic multiblock copolymer at a selective liquid-liquid interface.
abstract: An amphiphilic multiblock copolymer, [poly(4-vinylpyridine)-b-polystyrene-b-poly(4-vinylpyridine)](n) (P4VP-PS-P4VP)(n) bearing trithiocarbonate moieties (-S-CS-S-), was used as capping agent to fabricate the functional copolymer-capped Au nanoparticles. Due to the amphiphilic character of the multiblock copolymer, the (P4VP-PS-P4VP)(n)-capped Au nanoparticles were able to be entrapped and hence form a stable monolayer thin film at the (DMF-H(2)O)/diethyl ether interface. Note that DMF-H(2)O is a good mixed solvent for P4VP and a nonsolvent for PS, whereas diethyl ether is a good solvent for PS and a nonsolvent for P4VP. A similar procedure can be applied to prepare monolayer thin film of the (P4VP-PS-P4VP)(n)-capped Ag nanoparticles at the (DMF-H(2)O)/diethyl ether interface, which exhibits enhanced surface Raman signal. We further demonstrate that the stable monolayer of (P4VP-PS-P4VP)(n)-capped Au nanorods can also be fabricated by using the ligand-exchange method.
authors.affiliation: MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou, China. duby@zju.edu.cn
authors.forename: Binyang
authors.initials: B
authors.lastname: Du
authors.forename: Xiujuan
authors.initials: X
authors.lastname: Chen
authors.forename: Bin
authors.initials: B
authors.lastname: Zhao
authors.forename: Aixiong
authors.initials: A
authors.lastname: Mei
authors.forename: Qi
authors.initials: Q
authors.lastname: Wang
authors.forename: Junting
authors.initials: J
authors.lastname: Xu
authors.forename: Zhiqiang
authors.initials: Z
authors.lastname: Fan
mesh_terms: D006046:Gold / Q000737:chemistry; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D018625:Microscopy, Atomic Force; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D011108:Polymers / Q000737:chemistry*; D011137:Polystyrenes / Q000737:chemistry; D011145:Polyvinyls / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D011108:Polymers; D011137:Polystyrenes; D011145:Polyvinyls; C019535:poly(4-vinylpyridine); D006046:Gold