【公開日：2025.06.10】【最終更新日：2025.04.30】
課題データ / Project Data
課題番号 / Project Issue Number
24KU1036
利用課題名 / Title
様々な数のPtナノ粒子を有するAu@Ag-Ptコア@マルチシェルナノ粒子の触媒特性の評価
利用した実施機関 / Support Institute
九州大学 / Kyushu 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）物質・材料合成プロセス/Molecule & Material Synthesis（副 / Sub）-
【重要技術領域 / Important Technology Area】（主 / Main）次世代ナノスケールマテリアル/Next-generation nanoscale materials（副 / Sub）革新的なエネルギー変換を可能とするマテリアル/Materials enabling innovative energy conversion
キーワード / Keywords
ナノ粒子/ Nanoparticles,環境発電/ Energy Harvesting,赤外・可視・紫外分光/ Infrared/visible/ultraviolet spectroscopy
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)
LEE Hujun
所属名 / Affiliation
九州大学大学院工学府材料工学専攻
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
深堀 明博
利用形態 / Support Type
（主 / Main）機器利用/Equipment Utilization（副 / Sub）,技術補助/Technical Assistance
利用した主な設備 / Equipment Used in This Project
KU-513：ゼータ電位・粒径・分子量測定装置群
KU-505：紫外可視近赤外分光測定装置装置群
報告書データ / Report
概要（目的・用途・実施内容）/ Abstract (Aim, Use Applications and Contents)
Au@Ag-Pt core@multi-shell nanoparticles (NPs) were prepared using a co-reduction method, and its catalytic activity was evaluated for the reduction of methylene blue (MB) dye. The catalytic activity of Au@Ag-Pt core@multi-shell NPs in the presence of sodium borohydride (NaBH4) as a reducing agent was investigated using a UV-Vis spectrophotometer. The results demonstrated that Au@Ag-Pt core@multi-shell NPs exhibited remarkable catalytic activity, achieving complete MB reduction within 1 minute. Consequently, the Au@Ag-Pt NPs had great potential for dye reduction in real wastewater due to their exceptional catalytic properties.
実験 / Experimental
The reduction of MB dye was carried out in the presence of Au@Ag-Pt core@multi-shell NPs to evaluate the catalytic activity of NPs. A mixture of 5 mL MB solution (0.1 mM) and 0.5 mL NaBH4 solution (0.05 M) was prepared, followed by the addition of 0.4 mL Au@Ag-Pt NPs (0.01 mM). The reaction progress was monitored using a UV-visible double-beam spectrophotometer by recording time-dependent UV-Vis absorption spectra at 664 nm in a quartz cuvette with a 1 mm path length. The UV-Vis spectra were collected at regular intervals, revealing that MB reduction was completed within 1 minute. For comparison, the same procedure was performed without Au@Ag-Pt NPs and NaBH4 to assess their catalytic role. Spectral scanning was conducted over a wavelength range of 200–800 nm at room temperature.
結果と考察 / Results and Discussion
The catalytic reduction activity of the NPs was assessed for the conversion of MB dye to leuco-MB (LMB) using NaBH4 as the reducing agent. To verify the catalytic role of the NPs, UV-Vis absorption spectra were recorded for MB reduction in the absence of both nanoparticles and NaBH4, as shown in Figure 1. The spectra displayed a distinct absorption peak at 664 nm, corresponding to the 664 nm (π-π*) and 612 nm (n-π*) transitions [1]. In the absence of NPs, the reduction of MB dye proceeded at an extremely slow rate, with the characteristic peak at 664 nm remaining unchanged even after 60 minutes, as illustrated in Figure 1a. Additionally, when NaBH4 was not present, the absorption peak at 664 nm remained constant, confirming that no significant interaction occurred between MB dye and Au@Ag-Pt NPs, as shown in Figure 1b. These findings indicate that neither nanoparticles nor NaBH₄ alone can facilitate the conversion of MB to LMB, suggesting that the nanoparticles serve as catalysts to enhance the reduction process driven by NaBH₄. Furthermore, as shown in Figure 2, the NPs exhibited approximately 99% catalytic activity and maintained high catalytic activity even after six months, demonstrating their excellent durability.
図・表・数式 / Figures, Tables and Equations
Fig. 1. The UV-Vis absorption spectra for reduction of MB dye in (a) the absence of NPs, (b) NaBH4, and (c) in the presence of 0.4 ml of NPs with NaBH4.
Fig. 2. Recycling activity of 0.4 ml of solution with initial NPs and after 6 months.
その他・特記事項（参考文献・謝辞等） / Remarks(References and Acknowledgements)
[1] C. Sharma, S. Ansari, M.S. Ansari, S.P. Satsangee, M.M. Srivastava, Single-step green route synthesis of Au/Ag bimetallic nanoparticles using clove buds extract: Enhancement in antioxidant bio-efficacy and catalytic activity, Materials Science and Engineering C 116 (2020). https://doi.org/10.1016/j.msec.2020.111153.
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.
- ⽇本⾦属学会2025年春期(第176回)講演⼤会, 2025.03.10
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