Fabrication of functional colloidal crystals containing movable inner cores with their locations controlled by external fields

2016 Fiscal Year Final Research Report

• Project/Area Number: 26286019
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Nanomaterials engineering
• Research Institution: Tohoku University
• Principal Investigator: Nagao Daisuke 東北大学, 工学(系)研究科(研究院), 教授 (50374963)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: ナノ粒子 / 中空粒子 / 規則配列 / 可動

Outline of Final Research Achievements

The field strength in surface enhanced Raman scattering between plasmonic nanoparticles strongly depends on distances between the nanoparticles. Precise control over dispersion-aggregation of particles in a suspension is required to apply the intrinsic surface properties of particles to functional devices. Since unstable particles in a suspension generally aggregate to form large aggregates, it is very difficult to handle aggregates composed of a small number of particles. In the present work where hollow type colloidal crystals incorporating movable cores were fabricated, direct observations of the movable core with an optical microscope experimentally proved that the distance between particles incorporated in the colloidal crystal could be reversibly controlled by application of external field such as AC electric field.

Free Research Field

材料化学工学