National University Corporation Okayama University
Observation of new energy phenomena caused by light irradiation on nested materials [University of Tsukuba, Okayama University, Hiroshima Institute of Technology, University of Rennes, Tokyo Institute of Technology, Nagoya University, Tohoku University, JST]
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University of Tsukuba, Okayama University, Tsuru Gakuen Hiroshima Institute of Technology, University of Rennes, Tokyo Institute of Technology, Tokai National University Organization Nagoya University, Tohoku University, National Research and Development Corporation This is a press release of the joint research results of the Japan Science and Technology Agency (JST).
June 7, 2024 (Reiwa 6) National University Corporation Okayama University https://www.okayama-u.ac.jp/
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-Key points of presentation-
We discovered that when light is applied to a nested cylindrical structure in which carbon nanotubes are wrapped in boron nitride nanotubes, a loophole for electrons appears between the two. It is expected to find applications in a wide range of fields, including the development of ultra-high-speed optical devices, ultra-high-speed manipulation of electrons generated by light irradiation, and efficient heat exhaustion from devices.
◆Overview
In recent years, it has been reported that new properties emerge when layered or cylindrical materials (low-dimensional materials) that are only one atom thick are stacked on top of each other. The static properties of these structures, such as their electrical conductivity properties, had been investigated extensively. However, little research has been done on dynamic properties such as the interlayer electron transfer caused by light irradiation and the subsequent atomic motion.
In this research, we synthesized a nested cylindrical structure by wrapping carbon nanotubes (CNTs) with boron nitride nanotubes (BNNTs), and observed the movement of electrons and atoms that occurred when the structure was irradiated with light. Regarding the movement of electrons, we observed the instantaneous changes in molecular and electronic structure caused by light irradiation using broadband ultra-high-speed transient transmittance measurements that can capture the accuracy of 1/10 trillionth of a second. We also observed the motion of atoms using ultrafast time-resolved electron diffraction, which can be observed with an accuracy of one-trillionth of a second. As a result, we discovered that when different types of
low-dimensional materials are stacked on top of each other, an electron loophole (channel) appears. Furthermore, we found that electrons generated by shining light onto CNTs migrate into BNNTs through this channel. The energy of these excited electrons is quickly converted to thermal energy within the BNNT, making it possible to transport thermal energy extremely quickly.
This research has revealed a new physical phenomenon that occurs at the interface of two different materials. In addition to ultra-fast transport of thermal energy, this phenomenon has the potential to be applied to a variety of new technologies, including the development of ultra-fast optical devices and the ultra-fast manipulation of electrons and holes generated by light irradiation.
This content was published on June 3, 2024.
[Image 2: https://prtimes.jp/i/72793/2248/resize/d72793-2248-a41c149d6112ea1da3ad-1.jpg&s3=72793-2248-cdba38ceffd53c8780531938320cadf4-800×600.jpg] Van der Waals heterostructure of carbon nanotubes (CNT) and boron nitride nanotubes (BNNT) and their energy transport phenomenon (CNT on the inside, BNNT on the outside)
◆Principal Investigator: University of Tsukuba, Department of Mathematics and Materials/Energy and Materials Science Research Center, Masaki Haneda, Associate Professor, Okayama University Academic Research Institute, Department of Environmental Life and Natural Sciences, Hiroaki Suzuki, Research Associate Professor, Hiroshima Institute of Technology, Faculty of Engineering, Department of Environmental Civil Engineering, Hiroshima Institute of Technology, Norifumi Omura, Associate Professor, Faculty of Science, University of Rennes Department of Physics Romain Bertoni Associate Professor ◆Paper information Photoinduced dynamics during electronic transfer from narrow to wide bandgap layers in one-dimensional heterostructured materials. (structural measurement) [Author names] Yuri Saida (graduate student at the University of Tsukuba at the time of the research), Thomas Gauthier (graduate student at the University of Rennes), Hiroshi Suzuki (research associate professor at Okayama University), Norifumi Omura (associate professor at Hiroshima Institute of Technology), Yomo Ryo (graduate school, University of Tsukuba at the time of research), Yui Iwasaki (graduate student, University of Tsukuba), Godai Noyama (graduate student, University of Tsukuba), Misaki Kishibuchi (graduate school, Okayama University at the time of research), Yuichiro Tanaka (graduate school at the time of research), Wataru Yajima (student at the time of research) (Graduate student, University of Tsukuba), Nicolas Godin (University of Rennes), Gael Prival (University of Rennes at the time of the research), Tomoharu Tokunaga (Assistant Professor, Nagoya University), Shota Ono (Associate Professor, Tohoku University at the time of the research), Shinya Koshihara (Professor, Tokyo Institute of Technology) ), Kenji Tsuruta (Professor, Okayama University), Yasuhiko Hayashi (Professor, Okayama University), Romain Bertoni (Associate Professor, University of Rennes), Masaki Hada (Associate Professor, University of Tsukuba) [Published journal] Nature Communications [Published date] May 30, 2024 Japan [DOI] 10.1038/s41467-024-48880-3
◆Research funding This research is supported by the Japan Science and Technology Agency (JST) Emergent Research Support Project – JPMJFR211V – “New developments in dynamic structural analysis of nanostructures by creating high-coherence, ultra-short pulsed electron beams (Representative: Masaki Hada) )”, Japan Society for the Promotion of Science (JSPS) Grant-in-Aid for Scientific Research (B) “Development of a THz-wave pumped electron diffraction probe experimental system and pioneering research on strong electric field-induced phenomena in materials (Representative: Masaki Hada) ”, International Collaborative Research Acceleration Fund (International Collaborative Research Enhancement (A)) “Energy transport in van der Waals heterostructures observed by complementary use of ultrafast diffraction and
spectroscopy (Representative: Masaki Haneda)”, Specially Promoted Research “ The project was supported by the “Challenge to Develop New Photo-Induced Cooperative Phenomena Materials Created by Integrated Quantum Dynamics of Light and Matter” (Representative: Shinya Koshihara).
◆Detailed research details Observation of new energy phenomena caused by light irradiation on nested materials
https://www.okayama-u.ac.jp/up_load_files/press_r6/press20240603-2.pdf
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◆Contact information for this matter
-Research-related matters- Masaki Hada Associate Professor, Department of Mathematics and Materials/Energy and Materials Science Research Center, University of Tsukuba TEL: 029-853-5289 URL:
https://hadamasaki.com -Regarding interviews and reporting- University of Tsukuba Public Relations Department TEL: 029-853-2040 Okayama University General Affairs and Planning Department Public Relations Division TEL: 086-251-7292 Hiroshima Institute of Technology Tsuru Gakuen Public Relations Department TEL: 082-921-3128 Tokyo Institute of Technology General Affairs Department Public Relations Division TEL: 03-5734 -2975 Tokai National University Organization Nagoya University Public Relations Division TEL: 052-558-9735 Tohoku University Institute for Materials Research Information Planning Office Public Relations Team TEL: 022-215-2144 Japan Science and Technology Agency Public Relations Division TEL: 03-5214-8404-JST Regarding business – Go Kato Emergent Research Promotion Department, Japan Science and Technology Agency TEL: 03-5214-7276
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