Soft-nanocoupling between silica and gold nanoparticles based on block copolymer

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• 作者：Qian Zhang^a ; ^{qzh@xaut.edu.cn} ; Shuhuan Yang^a ; ¹ ; Tingting Zhu^a ; ¹ ; Jung Kwon Oh^b ; Pengfei Li^c
• 关键词：Nano-particle ; Soft-nanocoupling ; RAFT ; Block copolymer
• 刊名：Reactive and Functional Polymers
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：110
• 期：Complete
• 页码：30-37
• 全文大小：1339 K
• 卷排序：110

文摘

A novel triblock copolymer of ABC type was synthesized by RAFT polymerization with good control and successfully acts as a specific “adhesive” to “glue” the SiO2 nanoparticles (NPs) and Au NPs together to make a hybrid. This method, with the coined name, soft-nanocoupling, is based on specific anchoring of organic groups onto the surface of inorganic nanoparticles with all-covalent interactions. SiO2 and Au NPs were used as a proof of concept in this contribution. For the triblock copolymer, namely POE-PGMA-PMPS {poly[oligo(ethylene oxide) methyl ether metharylate]-b-polyglycidyl methacrylate-b-poly[3-(methacryloxypropyl) trimethoxysilane]}, the POE block with oligo-PEG side chains was used to improve the dispersability in solvent media; the PGMA block that was further reacted with lipoic acid was used to anchor onto the Au NPs; and the silane-containing PMPS block can “grab” the SiO2 NPs. It was found that the resulting SiO2-Au hybrid has a corona shell of SiO2 NPs with Au NPs tightly embedded inside, and can even tolerate a harsh sonication process of 1 h. Since the soft triblock copolymer functions as a bridge to couple Au and SiO2 NPs together, the process is called soft-nanocoupling. Compared to the conventional hard-coupling process, which requires specific case by case procedures, soft-nanocoupling is more straightforward, and especially can be designed in a modular way depending on the specific NPs used. With the well-established synthetic methodologies of NPs of single components to date, such as SiO2, Au, FexOy etc., all that is needed to make hybrid NPs is the proper design of a specific “glue” with anchoring moieties targeting the selected NPs. Thus, the soft-nanocoupling methodology affords a new platform for fabricating hybrid nano-objects from NPs using block copolymers.