RESEARCHERS
Principal Researcher
Nanomaterials Microdevices Research Center
Professor Hideo Wada
Member
Department of Electrical and Electronic Systems Engineering
Professor Toshihiko Maemoto
Member
Department of Electronics and Information Systems Engineering
Professor Kazuto Koike
Member
Department of Electrical and Electronic Systems Engineering
Professor Shigehiko Sasa
Member
Department of Electrical and Electronic Systems Engineering
Associate Professor Masatoshi Koyama
Member
Department of Electronics and Information Systems Engineering
Associate Professor Nobuya Hiroshiba
Member
Department of General Education
Associate Professor Akira Fujimoto
OVERVIEW
It is well-known that vanadium dioxide (VO2) undergoes a crystal phase transition at around 70℃, and the optical and electrical characteristics change are large due to the phase transition. In this project, while controlling the crystal phase transition temperature by adding impurities and inserting a buffer layer, we have established a film deposition technology on various glass substrate materials. We are considering application to smart windows having selective thermal radiation suppression effects in the infrared region.
In this study, a VO2 thin film with a nanoscale porous moth-eye structure was prepared using MOD (metal-organic compound decomposition) method. The goal is to demonstrate environment temperature adaptation by (1) heat radiation suppression from the surface and (2) realizing a low transition temperature.
BASIS OF RESEARCH
In order to solve the climate change caused by global warming, it is important to use thermal energy efficiently and control the exhaust heat released from substances. Vanadium dioxide (VO2) is an infrared radiation suppression functional material that utilizes the property of improving reflectance while the infrared transmittance decreases significantly as the temperature rises (thermochromism). In addition, since the infrared transmittance changes significantly as the temperature rises, it is expected to realize an infrared smart window that has a “direct optical switching function without electrical driving force”.
EXPECTED EFFECT
Research Activities
Conference
- 29th The Japan Society of Infrared Science and Technology Presentation October 29, 2020
- 18th Infrared radiation Application Related Society January 29, 2021
- 30th The Japan Society of Infrared Science and Technology Presentation Scheduled October 23, 2021
Exhibition
- Innovation Japan 2020 Access count 1220 hits
- Innovation Japan 2021 Scheduled 2021 August
Journal
- J. Jpn. Soc. Infrared Science & Technology 30(1) (2020) 75-81.
- IEEJ Transactions on Fundamentals and Materials 141(5) (2021) 345-350.
- J. Jpn. Soc. Infrared Science & Technology 30(1) (2020) accepted.
Expected intellectual property and patents
- A smart window that can autonomously control infrared transmittance by dimming only the heat rays in the infrared region without visible light dimming.
- Infrared metamaterial with reduced infrared reflection and thermal radiation suppression
After concluding joint research with a company, we will proceed with patenting and licensing except the manufacturing know-how shown above items.
AWARD
- 2020 Tanigawa Thermal Technology Promotion Fund Grant
- 2020 A-STEP (Adaptable and Seamless Technology Transfer Program through Target-driven R&D)
CONTACT US
For any inquiry about this project, please contact Center for Research Administration & Social Outreach.
