Preparation and application to functional electrodes of Ag nanostructures through silver halide photographic development

2019 Fiscal Year Final Research Report

• Project/Area Number: 17K05828
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Functional solid state chemistry
• Research Institution: Chiba University
• Principal Investigator: Okawa Yusuke 千葉大学, 大学院工学研究院, 准教授 (00213645)
• Project Period (FY): 2017-04-01 – 2020-03-31
• Keywords: ナノ構造体 / 機能電極 / 電極触媒 / 写真化学 / 写真現像 / 酵素 / バイオセンサー

Outline of Final Research Achievements

In order to apply to constructing novel functional electrode systems, the preparation and immobilization methods of silver nanofilament on electrodes were established through photographic development reactions. Method a) silver halide microcrystals were converted to the nanofilament through the development reaction, and the product was cast on a base electrode. Method b) Metallic silver was electrodeposited on a base electrode, and directly converted to the nanofilament through the development of a silver halide intermediate. These nanofilaments were modified with noble metals such as Au and Pt, giving specific and novel nanostructures. Au-modified nanofilaments exhibited excellent direct electron transfer activity to fructose dehydrogenase enzyme. Pt-modified ones exhibited high electrocatalytic activity for the direct electrooxidation of reducing sugars.

Free Research Field

電気化学

Academic Significance and Societal Importance of the Research Achievements

ナノスケールの材料はさまざまな応用が期待されており，新規なナノ構造の構築法の探索は広い分野に対して材料系の選択肢を増やすことができる．本研究では写真現像反応という温和な条件で再現性よく銀ナノ構造体を得られる方法に着目し，さらにそれをもとに新しいナノスケール素材の調製を行った．銀からなるナノフィラメント状の母体に他の貴金属元素を組み合わせることで，これを用いることでこれまで電極上での反応が限られていた反応のいくつかを効率的に行わせることができた．これらの反応系は医療や食品分析への応用，エネルギー変換等にも展開の可能性がある．