【公開日：2024.07.25】【最終更新日：2024.04.04】
課題データ / Project Data
課題番号 / Project Issue Number
23KU1018
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
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
赤外・可視・紫外分光/ Infrared/visible/ultraviolet spectroscopy,環境発電/ Energy Harvesting,ナノ粒子/ Nanoparticles
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)
Hujun Lee
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
柿田 有理子
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
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 synthesized using a co-reduction method, and their catalytic activity was evaluated towards the reduction of methylene blue (MB) dye. The catalytic activity of Au@Ag-Pt core@multi-shell NPs for the reduction of MB dye in the presence of NaBH4, as a reduction agent, was studied using a Uv-vis spectrophotometer. Au@Ag-Pt core@multi-shell NPs showed excellent catalytic activity, with reduction completed within 1 minute. Therefore, Au@Ag-Pt core@multi-shell NPs are potential candidates for the reduction of dye in real waste to their outstanding catalytic activity.
実験 / Experimental
Reduction of methylene blue (MB) dye by sodium borohydride (NaBH4) was performed in the presence of Au@Ag-Pt core@multi-shell NPs to test the catalytic activity of Au@Ag-Pt core@multi-shell NPs. 5 ml of MB (0.1 mM) dye and 0.5 ml of NaBH4 (0.05 M) solutions were mixed followed by the addition of Au@Ag-Pt NPs (0.4 ml, 0.01 mM). Uv-visible double-beam spectrophoto spectrophotometer was used to monitor the reaction progress by recording the time-dependent Uv-vis absorption spectra of these mixtures at 664 nm in a quartz cuvette (path length 1 mm). The Uv-vis spectrum was investigated at regular time intervals for this mixture, and the reduction of MB was found to be complete in just 1 minute. A similar procedure was followed in the absence of Au@Ag-Pt NPs and NaBH4 to examine the catalytic activity and role of Au @Ag-Pt NPs. Scanning was performed in the range of 200-800 nm at room temperature.
結果と考察 / Results and Discussion
The catalytic reduction performance of NPs was evaluated for the reduction of MB dye to Leucomethylene blue (LBM) by using NaBH4 as the reduction agent. To confirm the catalytic role of NPs, the Uv-vis absorption spectra for the reduction of MB dye in the absence of NPs and NaBH4 were measured as shown in Figure 1, and exhibit a characteristic absorption peak at 664 nm assigned to the 664 nm (π-π*) and 612 nm (n-π*) [1]. The reduction rate of MB dye was very slow in the absence of NPs, and the characteristic peak at 664 nm was still presented after 60 minutes of reaction as shown in Figure 1a. The absorption peak at 664 nm was constant in the absence of NaBH4, indicating that no additional reaction exists between MB dye and Au@Ag-Pt NPs as shown in Figure 1b. As a result, it is obvious that neither NPs nor NaBH4 alone can convert MB dye to LMB, and expected that NPs will act as a catalyst to activate the reaction in the reduction carried out by NaBH4.
図・表・数式 / Figures, Tables and Equations
Fig. 1. The Uv-vis absorption spectra for reducing MB dye in the absence of NPs (a), NaBH4 (b), and in the presence of 0.4 ml of NPs with NaBH4(c).
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.
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