Interfacial entrapment of noble metal nanoparticles and nanorods capped with amphiphilic multiblock copolymer at a selective liquid-liquid interface.
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.
Du
Binyang
B
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou, China. duby@zju.edu.cn
Chen
Xiujuan
X
Zhao
Bin
B
Mei
Aixiong
A
Wang
Qi
Q
Xu
Junting
J
Fan
Zhiqiang
Z
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
D011108:Polymers; D011137:Polystyrenes; D011145:Polyvinyls; C019535:poly(4-vinylpyridine); D006046:Gold