Synthesis and characterization of Pt-Pd nanoparticles with core-shell morphology

Nucleation and overgrowth of the Pd shells on the as-prepared and defined Pt seeds

Nguyen Viet Long, Tong Duy Hien, Toru Asaka, Michitaka Ohtaki, Masayuki Nogami

研究成果: ジャーナルへの寄稿記事

24 引用 (Scopus)

抄録

In the present research, Pt-Pd core-shell nanoparticles based on the as-prepared and defined Pt-seed cores with well-controlled size and morphology were synthesized. Their characterizations were investigated by using UV-vis spectroscopy, transmission electron microscopy (TEM), and high resolution (HR)TEM measurements. The high resolution elemental mappings were performed in the operation of high angle annular dark field (HAADF) in conjunction with scanning (S)TEM mode and X-ray energy dispersive spectroscopy (XEDS). It is found that not only the Pt-Pd core-shell nanoparticles were formed, but also the nucleation, growth, and the separate formation of single Pd nanoparticles as well. Interestingly, the as-prepared Pt cores without the morphological changes were protected by the overgrowths of the Pd shells during the successive reduction of sodium tetrachloropalladate (II) hydrate. There were the co-existence of the Frank-van der Merwe (FM) layer-by-layer and Stranski-Krastanov (SK) island-on-wetting-layer growth modes of the Pd shells on the as-prepared Pt cores. It is predicted that the SK growth became the favorable growth mode in the formation of the Pd shells in the formation Pt-Pd core-shell nanoparticles.

元の言語英語
ページ(範囲)7702-7709
ページ数8
ジャーナルJournal of Alloys and Compounds
509
発行部数29
DOI
出版物ステータス出版済み - 7 21 2011
外部発表Yes

Fingerprint

Seed
Nucleation
Nanoparticles
Transmission electron microscopy
High resolution transmission electron microscopy
Hydrates
Ultraviolet spectroscopy
Wetting
Sodium
Scanning

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

これを引用

Synthesis and characterization of Pt-Pd nanoparticles with core-shell morphology : Nucleation and overgrowth of the Pd shells on the as-prepared and defined Pt seeds. / Long, Nguyen Viet; Hien, Tong Duy; Asaka, Toru; Ohtaki, Michitaka; Nogami, Masayuki.

:: Journal of Alloys and Compounds, 巻 509, 番号 29, 21.07.2011, p. 7702-7709.

研究成果: ジャーナルへの寄稿記事

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T2 - Nucleation and overgrowth of the Pd shells on the as-prepared and defined Pt seeds

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AU - Ohtaki, Michitaka

AU - Nogami, Masayuki

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