Studies of contact and size effects for a single nano-particle by X-ray diffraction measurements

• Project/Area Number: 18K04904
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 28030:Nanomaterials-related
• Research Institution: Japan Synchrotron Radiation Research Institute
• Principal Investigator: Fukuyama Yoshimitsu 公益財団法人高輝度光科学研究センター, 回折・散乱推進室, 研究員 (20332249)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000); Fiscal Year 2020: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000); Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2018: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
• Keywords: ナノ粒子 / レーザートラップ / Ｘ線回折 / 光トラップ / X線回折 / サイズ効果 / 接触効果

Outline of Final Research Achievements

A single-beam optical-trap sample holder for X-ray diffraction measurements with synchrotron radiation was developed. The sample holder was used to obtain an X-ray diffraction image of a single nanometre-sized particle levitated in air without mechanical contact by the optical gradient force exerted by a focused laser beam. The ultimate aim of our study is to clarify the relationship between crystallite size and size-dependent physical properties of a single nanometre-sized particle. An optical trap in air environment is a useful sample holding method which determines a crystallite size and crystal structure to be determined simultaneously without mechanical contact.

Academic Significance and Societal Importance of the Research Achievements

近年、ナノ粒子の独特な物性が基礎と応用の両面から注目されている。ナノ粒子の物性では粒子のサイズ及び他の粒子や装置との接触の有無に大きく依存することが知られている。しかしナノ粒子1粒を非接触に保持する確立された方法が無かったために、ナノ粒子1粒に対する研究は進まなかった。本研究では、光トラップによるナノ粒子1粒の試料保持を実現し、Ｘ線回折法と組み合わせることにより、ナノ粒子1粒の真の構造物性を明らかにした。

Research Products

• [Journal Article] X-ray diffraction measurement of a single nanometre-sized particle levitated in air by an optical-trap sample holder (2020)
  • Author(s): Fukuyama Yoshimitsu、Yasuda Nobuhiro、Sugimoto Kunihisa、Kimura Shigeru
  • Journal Title: Journal of Synchrotron Radiation Volume: 27 Issue: 1 Pages: 67-74
  • DOI: 10.1107/s1600577519013651
  • Peer Reviewed