Development of advanced photochromic materials using semiconductor nanostructures

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K05012
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 32020:Functional solid state chemistry-related
• Research Institution: Ritsumeikan University
• Principal Investigator: Kobayashi Yoichi 立命館大学, 生命科学部, 教授 (10722796)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ナノ結晶 / フォトクロミズム / 電荷分離 / 励起状態ダイナミクス

Outline of Final Research Achievements

The photochromic reaction of water-soluble Cu-doped ZnS nanocrystal powder exhibits a decolorization rate that is almost independent of temperature within the range of 10 to 50 degrees Celsius. In this study, we revealed that the origin of the temperature dependence is the adsorbed water on the surface of the nanocrystals, and the process of adsorption and desorption of the adsorbed water with changes in temperature offsets the intrinsic temperature dependence of the photochemical reaction. Additionally, water-soluble ZnO nanocrystals, a semiconductor nanocrystal with a different composition, were synthesized and found to exhibit a photochemical reaction even in the presence of air.

Free Research Field

光化学

Academic Significance and Societal Importance of the Research Achievements

外気温に依存せず、高速に発色、消色するフォトクロミック材料は産業界における革新的な材料となることが期待される。さらに、半導体ナノ結晶の高速応答フォトクロミズムの着色の起源は秒から分オーダーにわたる超長寿命の電荷分離状態であることから、本研究はフォトクロミック材料開発だけでなく、光触媒や固体光化学の観点からも重要である。