| Download | - View accepted manuscript: Controlled synthesis and characterization of Ru-core-Pt-shell bimetallic nanoparticles (PDF, 1.3 MiB)
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| DOI | Resolve DOI: https://doi.org/10.1021/jp807154a |
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| Author | Search for: Hwang, Bing-Joe; Search for: Sarma, Loka Subramanyam; Search for: Chen, Ching-Hsiang; Search for: Bock, Christina1; Search for: Lai, Feng-Ju; Search for: Chang, Shi-Hong; Search for: Yen, Shih-Chieh; Search for: Liu, Din-Goa; Search for: Sheu, Hwo-Shuenn; Search for: Lee, Jyh-Fu |
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| Affiliation | - National Research Council of Canada. NRC Institute for Chemical Process and Environmental Technology
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| Format | Text, Article |
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| Abstract | A combined polyol and redox-transmetalation strategy has been proposed to synthesize Rucore-Ptshell bimetallic nanoparticles. By following the in situ X-ray absorption spectroscopy (XAS) at the Pt LIII and Ru K edges, the reduction mechanism of Ru nanoparticles (NPs) in tetraethylene glycol (TEG) solutions and the corresponding reaction of Ru NPs with the added Pt²⁺ ions in ethylene glycol (EG) solutions to form Rucore-Ptshell bimetallic nanoparticles was examined. The Pt LIII-edge XAS indicates that when the pH of H₂PtCl₆ in EG solution is adjusted to 12 and heated at 80 °C for 5 min, the platinum compound is found to be reduced to a Pt(II) form corresponding to [PtCl₄]²⁻ anionic species. At further reaction time of 10 min, the ligand environment around Pt(II) is changed from Cl⁻ to OH⁻ forming the [Pt(OH)₄]²⁻ species. Analysis of the Ru K-edge XAS results confirms that Ru₃(CO)₁₂ in TEG undergoes a partial decarbonylation when it is heated at 300 °C for 30 min and forms Ru₃(CO)₉ species. At further reaction time of 60 min, Ru₃(CO)₉ species are subjected to a complete decarbonylation to form Ru clusters in TEG solutions. When the EG solution containing [Pt(OH)₄]²⁻ ionic species is mixed with preformed Ru clusters, Pt²⁺ ions are reduced to Pt° on preformed Ru clusters at the expense of Ru via a redox-transmetalation process. The XAS structural parameters suggested that the resulting nanoparticles were of Rucore-Ptshell type structure with a higher extent of atomic distribution of Pt in the cluster when compared with Ru. The unique application of XAS as a fundamental characterization tool to realize the core-shell structure demonstrated here on the Ru-Pt bimetallic system can easily be extended to construct many other types of bimetallic systems for interesting applications. |
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| Publication date | 2008-11-19 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRCC 52144 |
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| NPARC number | 15329315 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | a21bbb1d-3ac8-48f4-97ab-be18ee65b55c |
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| Record created | 2010-05-19 |
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| Record modified | 2020-04-15 |
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