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A Facile Preparation of Highly Thermally Stable Silver Nanoparticles Using PS ‐ b ‐ P4VP ‐ b ‐ PS Triblock Copolymer as Multidentate Ligand
Author(s) -
Chen Fuqiang,
Li Aixiang,
Xu Guoyuan,
Li Qiuhong,
LYu Zijian
Publication year - 2016
Publication title -
journal of the chinese chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.329
H-Index - 45
eISSN - 2192-6549
pISSN - 0009-4536
DOI - 10.1002/jccs.201600066
Subject(s) - copolymer , chemistry , denticity , polystyrene , chain transfer , thermal stability , polymer chemistry , polymerization , ligand (biochemistry) , silver nanoparticle , raft , silver nitrate , molar ratio , nanoparticle , styrene , metal , chemical engineering , nuclear chemistry , polymer , organic chemistry , radical polymerization , catalysis , biochemistry , receptor , engineering
Silver nanoparticles (Ag NPs ) of improved thermal stability against long‐term aggregation were prepared using the polystyrene‐ b ‐poly(4‐vinylpyridine)‐ b ‐polystyrene ( PS ‐ b ‐ P4VP ‐ b ‐ PS ) triblock copolymer as a multidentate ligand. First, PS ‐ b ‐ P4VP ‐ b ‐ PS was synthesized by sequential reversible addition–fragmentation transfer ( RAFT ) polymerization of styrene and 4‐vinylpydine using a trithiocarbonate chain transfer agent (CTA). Then Ag NPs were obtained by in situ reduction of silver nitrate using PS ‐ b ‐ P4VP ‐ b ‐ PS as a multidentate ligand. The obtained Ag NPs were stable in solution for at least 24 h while being heated at 110°C. The effect of the molar ratio of N atoms of the P4VP chain segment and AgNO 3 on the stability of Ag NPs was studied, and the results suggested that Ag NPs were very stable even if the molar ratio of N atoms of the P4VP chain segment and AgNO 3 was very low. This method is promising to scale up the preparation of metal NPs with good dispersibility and thermal stability, which still remains challenging. To further improve its thermal stability, 1,4‐dibromobutane was used to chemically crosslink the P4VP chain segment in solution. However, the results proved that the crosslink method is infeasible to further improve the thermal stability of Ag NPs in this system.