Synthesis and Characterization of Hetero-metal Nanoparticles within Amphiphilic Copolymer Micelle as a Template Controlling Metal Ion Concentration

2016 Fiscal Year Final Research Report

• Project/Area Number: 26288064
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Polymer chemistry
• Research Institution: Tokyo University of Science
• Principal Investigator: Hidenori Otsuka 東京理科大学, 理学部, 教授 (00344193)
• Co-Investigator(Kenkyū-buntansha): 石黒 孝 東京理科大学, 基礎工学部, 教授 (10183162)
• Co-Investigator(Renkei-kenkyūsha): MATSUKUMA Daisuke 東京理科大学, 理学部第一部・応用化学科, 嘱託助教 (30569174)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ナノ粒子 / 触媒機能 / 自己会合ミセル / 複合金属ナノ粒子 / 活性酸素消去能

Outline of Final Research Achievements

We found that amphiphilic block copolymer (PEG-b-DPA) composed of poly(ethylene glycol) (PEG) as hydrophilic segment and 2,2-dipicolylamine (DPA) as hydrophobic and metal-coordination segment can be highly stable template for synthesizing platinum (Pt) NPs. PEG-b-DPA-Pt(II) obtained by the complexation with K2PtCl4 self-assembled into micelles with partially-localized Pt(II) in micelle core. The following reduction of Pt (II) provided homogeneously distributed Pt NPs (1-2 nm) in micelle (PEG-b-DPA-Pt(NPs)).
The significantly high redox-activity of PEG-b-DPA-Pt(NPs) promoted the spontaneous reduction of Ag ions. Elemental analysis suggested the formation of core-shell type (Pt@Ag) bimetallic NPs. These results suggested that the improved redox-activity by the combination of PEG-b-DPA with Pt NPs was attributed to the interchange of redox-active species between DPA and Pt NPs. Furthermore, redox activity of the Pt@Ag NPs was studied from chemical and biological view points.

Free Research Field

コロイド界面化学、生体材料