Development of real space charge density mapping method using atomic-resolution DPC STEM and its application to material interfaces
| Project/Area Number |
17H01316
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Inorganic materials/Physical properties
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| Research Institution | The University of Tokyo |
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Principal Investigator |
Shibata Naoya 東京大学, 大学院工学系研究科(工学部), 教授 (10376501)
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| Co-Investigator(Kenkyū-buntansha) |
石川 亮 東京大学, 大学院工学系研究科(工学部), 助教 (20734156)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥43,420,000 (Direct Cost: ¥33,400,000、Indirect Cost: ¥10,020,000)
Fiscal Year 2019: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2018: ¥30,290,000 (Direct Cost: ¥23,300,000、Indirect Cost: ¥6,990,000)
Fiscal Year 2017: ¥10,140,000 (Direct Cost: ¥7,800,000、Indirect Cost: ¥2,340,000)
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| Keywords | 走査透過型電子顕微鏡法 / 材料界面 / 電荷密度 / 微分位相コントラスト法 / 走査型透過電子顕微鏡 |
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| Outline of Final Research Achievements |
Based on the atomic resolution DPC STEM method developed by the applicants, we develop a new electron microscopy method for real-space mapping of the charge density distribution in the local region of materials at the atomic level. Furthermore, by applying this method to the analysis of material interfaces, we have conducted research aiming at clarifying the interface mechanisms from the atomic and electronic scales. First, the quantitative measurement method of atomic electric field by the atomic resolution DPC STEM was established, and the real space charge density mapping method was developed and applied. As a result, (1) succeeded in directly observing the total charge density distribution within atoms in GaN, (2) succeeded in the direct observation of atomic electric field in graphene and (3) in GaN-based semiconductor hetero interfaces. In addition, (4) the research results showing the capability of DPC STEM for ultra-high resolution magnetic field observation were obtained.
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| Academic Significance and Societal Importance of the Research Achievements |
本研究では、原子レベルの電荷密度分布を直接観察できる新たな電子顕微鏡手法開発を行った。その結果、原子の中心に位置する正電荷を持つ原子核と、その周囲を取り巻く負電荷をもつ電子雲を電荷分布として可視化することに成功した。本結果は、これまで原子観察がターゲットであった原子分解能電子顕微鏡を、原子内部や原子間の構造観察に進化させる画期的な成果である。また、材料界面では、界面形成に伴う電荷移動やポテンシャル形成が特性と密接に関連しているが、本研究により開発された微分位相コントラスト法は界面近傍における電場分布を超高分解能で観察できることから、材料界面解析において極めて有力な手法になると期待できる。
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Report
(4 results)
Research Products
(174 results)
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[Journal Article] Oxysulfide photocatalyst for visible-light-driven overall water splitting2019
Author(s)
Qian Wang, Mamiko Nakabayashi, Takashi Hisatomi, Song Sun, Seiji Akiyama, Zheng Wang, Zhenhua Pan, Xiong Xiao, Tomoaki Watanabe, Taro Yamada, Naoya Shibata, Tsuyoshi Takata, Kazunari Domen
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Journal Title
Nature Materials
Volume: 18
Pages: 827-832
DOI
Related Report
Peer Reviewed
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[Journal Article] Ferroelectric domains and phase evolution in (Fe:) KTa1-xNbxO3 crystals2017
Author(s)
H. Y. Zhao, K. Cai, Z. R. Fan, Z. D. Huang, Z. B. Ma, T. T. Jia, H. Kimura, Y. G. Yang, T. Matsumoto, T. S. Tohei, N. Shibata, Y. Ikuhara
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Journal Title
Applied Surface Science
Volume: 413
Pages: 01-6
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Possible Absence of Critical Thickness and Size Effect in Ultrathin Perovskite Ferroelectric Films2017
Author(s)
P. Gao, Z. Zhang, M. Li, R. Ishikawa, B. Feng, H.-J, Liu, Y.-L. Huang, N. Shibata, X. Ma, S. Chen, J. Zhang, K. Liu, E.-G. Wang, D. Yu, L. Liao, Y. -H. Chu, Y. Ikuhara
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Journal Title
Nature Communications
Volume: 印刷中
Pages: 15549-15549
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research
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[Journal Article] True Vapor-Liquid-Solid Process Suppresses Unintentional Carrier Doping of Single Crystalline Metal Oxide Nanowires2017
Author(s)
H. Anzai, M. Suzuki, K. Nagashima, M. Kanai, Z. Zhu, Y. He, M. Boudot, G. Zhang, T. Takahashi, K. Kanemoto, T. Seki, N. Shibata and T. Yanagida
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Journal Title
Nano Letters
Volume: 17
Pages: 4698-4705
DOI
Related Report
Peer Reviewed
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