Seminar & Colloquium
[세미나: 12월 14일(수), 오후 2시] Prof. Shigenori Fujikawa, Kyushu University
Title
Large scale surface nanofabrication for harvesting light and capturing CO2
Speaker
Prof. Shigenori Fujikawa, International Institute for Carbon Neutral Energy Research, Department of Applied Chemistry, Kyushu University
Education
- 1994 Bachelor: Faculty of Engineering, Kyushu University
- 1996 Master: Graduate School of Engineering, Kyushu University
- 1999 Ph.D.: Graduate School of Engineering, Kyushu University
Professional Experience
2021-Present Distinguished Professor, Kyushu University, Japan
2021-Present Director, Research Center for Negative Emissions Technologies, Kyushu University, Japan
2021-Present Professor, International Institute for Carbon-Neutral Energy Research, Kyushu University, Japan
2011-2021 Associate Professor, International Institute for Carbon-Neutral Energy Research, Kyushu University, Japan
2007-2009 Team Leader, RIKEN, Japan
2004-2012 Deputy team leader, RIKEN, Japan
2007-Present Board Member, NanoMembrane Technologies Inc.
2000-2007 Post doctorate Researcher, RIKEN, Japan
1999-2000 Research fellow of Japan Society for the Promotion of Science (JSPS), Yale University, US
| Date | Wednesday, December 14th, 2022
| Time | 14:00 ~
| Venue | 33동 125호 (WCU 다목적실)
[Abstract]
Surface nanofabrication is important to develop functional devices. Considering current environmental issues such as global warming and energy saving, surface nanostructures would have potential to tackle these issues. From the viewpoints of green energy, sun light should be utilized more and more efficiently. Thus, efficient light harvesting and utilization should be central issues. For combatting global warming, our society should manage CO2 flow in our life. Especially, CO2 capture directly from the atmosphere is now a central issue to directly reduce the concentration of CO2 in the air.
In our laboratory, we are developing new materials that can contribute to society through materials chemistry from the viewpoint of “ubiquitous”. The word “ubiquitous” means “existing anywhere and anytime. There are many resources on this planet that exist everywhere. Carbon dioxide in the atmosphere and light from the sky are available everywhere on earth. With the keyword of “nano”, nanomaterials whose size and structure are designed from the molecular level to the nano size can explore the new field of carbon-neutral chemistry for the effective utilization of this ubiquitous material and energy.
First topic will focus on light harvests and its utilization by surface nanostructure array. Especially, we are focusing on large scale array of metal nanoparticles (NPs) which exhibit unique optical properties, such as localized surface plasmon resonance (LSPR). The large-scale arrays of noble metal NP, such as silver and gold NP, were fabricated by selective growth only within a nanohole template prepared by block copolymer lithography. Some block copolymers (BCP) form nano-phase separation structures with specific pattern and periodicity. We fabricated large Ag NP array with regularly-ordered structures from this nanophase separation structures. In the case of Au NPs, the crystal shapes of Au NPs, such as pyramid, octahedral, and so on were observed. These nanoparticle array has nanogaps in between neighboured particles and it generate enhanced electromagnetic fields when the visible light was introduced to this array. This enhanced electromagnetic fields promote unusual photonic phenomena and we have also utilized this unique nanospaces for photon upconversion system.
The second topic is large, freestanding membranes with a thickness of nanometers. Ultrathin films can be considered "surface-only materials," where only the surface portion is trimmed from the bulk material. In large and ultrathin films, molecular behaviour governs the whole of film phenomena in the thickness direction of films, though nature of a film in lateral direction can be consider as bulk properties. In other words, ultrathin films are considered to be unique materials that combine both molecular and bulk phenomena simultaneously. We have developed large and ultrathin membranes with the lateral size of centimetres scale and the thickness of a few tens nanometers. Especially, we are now focusing on the development of CO2 capture nanomembrane directly from the atmosphere. Membrane-base direct CO2 capture from the air has been considered implausible for long time, but our developed free-standing nanomembranes could successfully separate CO2 directly from the air and open the way to develop membrane-based direct air capture, which has never been considered before.
| Host | 최인석 교수 (880-1712)