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Issue 1, 2015
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Formation of self-assembled multi-layer stable palladium nanoparticles for ligand-free coupling reactions

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Abstract

The structure of a recently developed Pd catalyst, named sulfur-modified gold-supported palladium (SAPd), has been determined to be composed of multi-layered Pd nanoparticles. SAPd is easily prepared by self-assembly on a sulfur-modified gold surface, and near-edge X-ray absorption fine structure (NEXAFS) analysis at the Pd K-edge determined that the Pd in SAPd is zero-valence analogous to metallic Pd. However, transmission electron microscopy (TEM) analyses and extended X-ray absorption fine structure (EXAFS) analysis clarified that SAPd has approximately 10 layers and consists of nanoparticles with a diameter less than 5 nm. High-density Pd nanoparticles were embedded without condensation. NEXAFS analysis at the S and C K-edge revealed that the organic matter containing sulfate and xylene as a major ingredient is distributed between Pd nanoparticles, and it seems to prevent condensation. These findings suggest that a highly efficient cross-coupling reaction, which was reported in earlier works, has been achieved by the high-density Pd nanoparticles.

Graphical abstract: Formation of self-assembled multi-layer stable palladium nanoparticles for ligand-free coupling reactions

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The article was received on 25 Sep 2014, accepted on 13 Nov 2014 and first published on 14 Nov 2014


Article type: Paper
DOI: 10.1039/C4RA11215F
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RSC Adv., 2015,5, 676-683

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    Formation of self-assembled multi-layer stable palladium nanoparticles for ligand-free coupling reactions

    M. Arisawa, M. Al-Amin, T. Honma, Y. Tamenori, S. Arai, N. Hoshiya, T. Sato, M. Yokoyama, A. Ishii, M. Takeguchi, T. Miyazaki, M. Takeuchi, T. Maruko and S. Shuto, RSC Adv., 2015, 5, 676
    DOI: 10.1039/C4RA11215F

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