Development of environment controlled AFM from ultra-high vacuum to ambient pressure and Investigation of surface defect effect

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14534
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 29020:Thin film/surface and interfacial physical properties-related
• Research Institution: Institute of Physical and Chemical Research (2022-2023); Nagaoka University of Technology (2021)
• Principal Investigator: Daiki Katsube 国立研究開発法人理化学研究所, 開拓研究本部, 研究員 (00831083)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 原子間力顕微鏡 / 走査トンネル顕微鏡 / 光触媒 / 水吸着

Outline of Final Research Achievements

To understand the relationship between the water adsorption and surface structure, we constructed the ultra-high vacuum scanning probe microscopy with a water molecules dozing system, and investigated the water adsorption on rutile TiO2(110)-(1×2) surface, anatase TiO2(101) surface, and SrTiO3(100)-(√13×√13) surface. The water adsorption behavior on each surface was analyzed by scanning tunneling microscopy and non-contact atomic force microscopy. We revealed the structure and charge state of the line defect on rutile TiO2(110)-(1×2) surface and the behavior of water adsorption on anatase TiO2(101) surface and SrTiO3(100)-(√13×√13) surface.

Free Research Field

表面科学

Academic Significance and Societal Importance of the Research Achievements

本研究で構築した実験系は、材料表面における水吸着の原子スケール観測を可能にした。これは、水の吸着が関わる現象(光触媒反応や酸化反応)の理解に貢献できる。
また、光触媒表面の水分子吸着挙動の理解は、光触媒反応素過程の理解を進展させ、表面設計による光触媒効率向上のための材料設計指針の構築への道を拓くものである。