Development of Single Particle Potential-Scanning Plasmonic Sensors toward Three-Dimensional Mapping

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K14017
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Analytical chemistry
• Research Institution: The University of Tokyo
• Principal Investigator: Tatsuma Tetsu 東京大学, 生産技術研究所, 教授 (90242247)
• Co-Investigator(Renkei-kenkyūsha): NISHI Hiroyasu 東京大学, 生産技術研究所, 助教 (70714137)
• Research Collaborator: KAWAWAKI Tokuhisa ; SAITO Koichiro ; WU Ling ; AKIYOSHI Kazutaka
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 局在表面プラズモン共鳴 / 金属ナノ粒子 / 化学センサ / 2次元マッピング / プラズモニクス

Outline of Final Research Achievements

Gold nanorods were immobilized on a transparent electrode and a scattering spectrum was obtained from each nanorod by dark-field microspectroscopy. The potential of the electrode was scanned so that potential-scanning scattering spectrum was obtained at a specific wavelength. The peak potential was negatively shifted as the local refractive index increased. A single plasmonic nanoparticle can therefore be employed for affinity sensing and two-dimensional mapping should also be possible by using a nanoparticle ensemble. Gold nanorod dimers exhibited higher refractive index sensitivities than single nanorods in both potential-scanning and conventional wavelength-scanning based plasmon sensing. We also prepared plasmonic nanoparticle arrays on a transparent electrode by a lithographic method.

Free Research Field

光電気化学