Deposition of Au nanoshells on thermally grown patterned Ag nanoparticles from the block copolymer micelle thin films by seeding method

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• 作者：Himadri Acharya ^{himadriau@yahoo.co.in" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ag nanoparticle ; BCP template ; Au nanoshell ; Thin film ; Plasmonic properties
• 刊名：Reactive and Functional Polymers
• 出版年：2016
• 出版时间：August 2016
• 年：2016
• 卷：105
• 期：Complete
• 页码：122-128
• 全文大小：1172 K

文摘

A facile method of fabricating patterned Ag–Au core–shell nanoparticles has been demonstrated using stepwise reduction and seeded deposition from block copolymer (BCP) micelle thin films. Spherical inverse micelles of polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP) copolymer in PS-selective toluene produce organic–inorganic complexes by coordinating silver acetate salt (Ag salt) to the hydrophilic P4VP core. Rapid thermal decomposition of Ag salt-loaded BCP micelles at 300 °C for 5 min leads to the formation of stable Ag nanoparticles of 20–25-nm size on a quartz substrate. The variations in annealing temperature, time, and substrate types influence the resulting Ag nanostructures. Transmission electron microscopy investigations reveal that gold (Au) shells of approximately 2.5-nm size on the Ag nanoparticles have been deposited by the seeding method using a selective reducing agent. Ag–Au core–shell nanoparticles can also help to control the hybridized surface plasmon band.