Research Institute for Electronic Science, Hokkaido University


LAST UPDATE 2017/02/25

  • 研究者氏名
    Researcher Name

    三友秀之 Hideyuki MITOMO
    准教授 Associate Professor
  • 所属
    Professional Affiliation

    Research Institute for Electronic Science, Hokkaido University

    Section of Biology and Life Sciences, Laboratory of Molecular Devices
  • 研究キーワード
    Research Keywords

    Soft materials
    Metal nanoparticles assemblies
    Photonic functions/Plasmonics
Research Subject
Development of functional devices using metal nanoparticles and soft matter

研究の背景 Background


Novel properties or functions come into existence from the downsizing of the materials in the order of nanometer-scale. In particular, gold or silver nanoparticles attract much attention due to their functions induced by light irradiation, such as enhancement of fluorescence or Raman scattering and photocatalytic activity. It is expected that metal nanostructures which have controlled size and shape will show higher functions. Therefore huge effort has been spent for the fabrication of size and shape controlled nanoparticles andtheir assemblies.

研究の目標 Outcome


The main objectives of my research are development of fabrication method for metal nanostructures via self-assembly and creation of highly functional plasmonic devices with dynamically tunable metal nanostructures. To realize dynamic tuning of metal nanostructures I have focused on the use of the hydrogel, which is a 3D polymer network swollen with water and can change its volume by external signal or environmental change. It is already shown that the expansion or shrinkage of the gel changed the distance of the Au pattern on it. This will work for the creation of tunable plasmonic devices.

研究図Research Figure

Fig.1. Schematic illustration of the approach for the creation of novel functional devices Fig.2. Microscopic images of the micron-scale Au pattern on the hydrogel (upper) and optical image of nano-scale Au pattern on the gel (bottom) in various salt concentration solutions Fig.3. Absorption spectra of the AuNPs thin film attached on the gel in various salt concentration solution (0, 1.5, 15, 150, 1000 mM NaCl, respectively)

文献 / Publications

Adv. Opt. Mater., 4, 259–263 (2016), Small, 14, 1704230 (2018), Nanoscale Adv., 1, 1731-1739 (2019), Nanoscale Adv., 2, 3798-3803 (2020), Langmuir, 36, 13, 3590-3599 (2020), Nanoscale Adv., 3, 3762-3769 (2021), Chem. Mater., 34, 4062–4072 (2022)