2019 Fiscal Year Final Research Report

Development of a Voltammetric-Localized Surface Plasmon Resonance Fiber Optic Sensor

Research Project

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Project/Area Number	16H02976
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Research Field	Environmental engineering and reduction of environmental burden
Research Institution	University of Toyama
Principal Investigator	Kuramitz Hideki 富山大学, 学術研究部理学系, 教授 (70397165)
Co-Investigator(Kenkyū-buntansha)	菅原一晴前橋工科大学, 工学部, 教授 (30271753) 田口明富山大学, 研究推進機構水素同位体科学研究センター, 講師 (40401799)
Project Period (FY)	2016-04-01 – 2020-03-31
Keywords	分光電気化学 / 光ファイバーセンサー / 局在表面プラズモン共鳴 / 金ナノ粒子 / 金ナノロッド
Outline of Final Research Achievements	A voltammetric-localized surface plasmon resonance (V-LSPR) fiber optic sensor was develped. This sensor is constituted by indium tin oxide (ITO)-coated multimode fiber optic and gold nanoparticles. We demonstrated two types of sensing method which are based on a shift of LSPR peak wavelength accompanying the electrochemical oxidation & reduction of an analyte, and potential-scanning for detection of refractive index changing. For the first technique, Ru(NH3)62+/3+, methylene blue and Fe(CN)63-/4- were used as model analytes. The optical responses caused by the electrochemical reaction of the analytes showed linear relationship between LSPR peak shift and these concentrations. The second sensing was based on the detection of the LSPR peak potential during the potential-scanning, which shifts with refractive index changing in the solution. The developed sensor was successfully applied to the bio-detection of neutravidin by using a avidin-biotin interaction on the sensor surface.
Free Research Field	環境化学、分析化学
Academic Significance and Societal Importance of the Research Achievements	高い選択性を有するセンサーデバイスの開発は、簡便な環境分析法の提案やシンプルな環境分析システムの構築を実現するために極めて重要である。本研究では、電気化学－LSPR（局在表面プラズモン共鳴）法という2元の選択性を同時に発現する分析手法を世界で初めての光ファイバーセンサーに展開することに成功した。このセンサーは分析対象物質の電気化学的な酸化還元反応に伴って可逆的に変化する金ナノ粒子のLSPRシグナルの変調を利用するものである。