【公開日：2025.06.10】【最終更新日：2025.05.14】
課題データ / Project Data
課題番号 / Project Issue Number
24HK0144
利用課題名 / Title
Synthesis of smart nanocluster and observation of light induced assembly dynamics
利用した実施機関 / Support Institute
北海道大学 / Hokkaido Univ.
機関外・機関内の利用 / External or Internal Use
内部利用（ARIM事業参画者以外）/Internal Use (by non ARIM members)
技術領域 / Technology Area
【横断技術領域 / Cross-Technology Area】（主 / Main）計測・分析/Advanced Characterization（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）量子・電子制御により革新的な機能を発現するマテリアル/Materials using quantum and electronic control to perform innovative functions（副 / Sub）-
キーワード / Keywords
表面・界面・粒界制御/ Surface/interface/grain boundary control,電子顕微鏡/ Electronic microscope
利用者と利用形態 / User and Support Type
利用者名（課題申請者）/ User Name (Project Applicant)
Padinhare Kayakali Hashim
所属名 / Affiliation
Research Institute for Electronic Science, Hokkaido University
共同利用者氏名 / Names of Collaborators in Other Institutes Than Hub and Spoke Institutes
ARIM実施機関支援担当者 / Names of Collaborators in The Hub and Spoke Institutes
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）-
利用した主な設備 / Equipment Used in This Project
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Superstructures formed by the self-assembly of nanoclusters (clusters of 18 or 24 gold atoms) are an emerging area in nanomaterials science due to their unique material properties. Controlling the assembly process of nanoclusters and understanding their assembly–disassembly dynamics are essential for achieving reversible self-assembly of superstructures and for tuning their stimuli-controlled optical properties. This project aims to design and fabricate superstructures through the self-assembly of gold "smart" nanoclusters." We will begin by modifying the surface of the nanoclusters with "photo-responsive molecular ligands" that can regulate both the assembly of the superstructures and their optical properties under external light. The project will be implemented in three key work plans: (1) machine learning-based design of visible-light photoswitches, (2) synthesis of "photo-responsive molecular ligands" and "smart nanoclusters," and (3) light-induced assembly–disassembly dynamics investigated through STEM analysis. As a result, this project will provide a comprehensive understanding of the nanocluster assembly process and the role of light in modulating assembly dynamics.
実験 / Experimental
1. Design and synthesis of visible-light active photoswitches containing a thiol (SH) group. 2. Photoisomerization study of nanocluster (clusters of 18 gold atoms) by using visible light and absorption spectroscopy. 3. STEM analysis of nanocluster assembly by visible light. We checked the nanocluster assembly before and after light irradiation. By STEM imaging, we checked the formation of nanocluster superstructure. In the next step, we will further study the assembly dynamics by in-situ irradiation after optimizing several parameters.
結果と考察 / Results and Discussion
We synthesized thiol-appended thiazole photoswitches that isomerized by visible-light irradiation and conjugated onto gold atom. A cluster containing 18 gold atoms was prepared which then assembled to smart superstructure. STEM analysis indicated formation of superstructures only after light irradiation to the photoswitch-appended gold nanocluster (see Figure 1). We did not observe any nanostructure before light irradiation. These results indicate that cis-isomer of photoswitch triggered the assembly of gold nanocluster forming a superstructure.
図・表・数式 / Figures, Tables and Equations
Figure 1: STEM Image showing the assembled gold nanocluster after visible-light irradiation
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
成果発表・成果利用 / Publication and Patents
論文・プロシーディング（DOIのあるもの） / DOI (Publication and Proceedings)
口頭発表、ポスター発表および、その他の論文 / Oral Presentations etc.
特許 / Patents
特許出願件数 / Number of Patent Applications：0件
特許登録件数 / Number of Registered Patents：0件