ISSN 0253-2778

CN 34-1054/N

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Surface interaction between Au nanoparticles and surfactants studied by XAFS

  • National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2014.03.010
  • Received Date: 08 October 2012
  • Accepted Date: 25 November 2012
  • Rev Recd Date: 25 November 2012
  • Publish Date: 30 March 2014
    Abstract

  • Abstract

    X-ray absorption fine structure (XAFS) was used to study the atomic and electronic structure of Au nanoparticles affected by three kinds of surfactants, triphenylphosphine (PPh3), dodecanamine (C12H27N) and dodecanethiol (C12H26S). XAFS and TEM results indicate that the surface interaction intensity between Au nanoparticles and surfactants is in the order of C12H26S, C12H27N and PPh3. The head-group P atom in the PPh3 molecule is weakly bonded Au adatoms of Au nanoparticles, and the resulting nanoparticle size is about 72 nm. However, the head-group N atom in C12H27N and S atom in C12H26S are strongly bonded to Au adatoms, forming Au—N and Au—S covalent bonds, respectively, which effectively inhibits the aggregation of nanoparticles and leads to the smaller size of 31 nm. Furthermore, the bond length of the first nearest Au—Au coordination decreases from 282  for PPh3 capping to 279  for C12H26S capping, along with the decrease of Au—Au coordination number from 113 to 101, indicating the strongest interaction between C12H26S and Au nanoparticles. The XANES results indicate that the significant charge transfer of Au nanoparticles only occurs for the case of C12H26S capping.

    Abstract

    X-ray absorption fine structure (XAFS) was used to study the atomic and electronic structure of Au nanoparticles affected by three kinds of surfactants, triphenylphosphine (PPh3), dodecanamine (C12H27N) and dodecanethiol (C12H26S). XAFS and TEM results indicate that the surface interaction intensity between Au nanoparticles and surfactants is in the order of C12H26S, C12H27N and PPh3. The head-group P atom in the PPh3 molecule is weakly bonded Au adatoms of Au nanoparticles, and the resulting nanoparticle size is about 72 nm. However, the head-group N atom in C12H27N and S atom in C12H26S are strongly bonded to Au adatoms, forming Au—N and Au—S covalent bonds, respectively, which effectively inhibits the aggregation of nanoparticles and leads to the smaller size of 31 nm. Furthermore, the bond length of the first nearest Au—Au coordination decreases from 282  for PPh3 capping to 279  for C12H26S capping, along with the decrease of Au—Au coordination number from 113 to 101, indicating the strongest interaction between C12H26S and Au nanoparticles. The XANES results indicate that the significant charge transfer of Au nanoparticles only occurs for the case of C12H26S capping.
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    • References(12)
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    Giljohann D A, Seferos D S, Daniel W L, et al. Gold nanoparticles for biology and medicine [J]. Angewandte Chemie International Edition, 2010, 49(19): 3 280-3 294.
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    [3]
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    Zheng N, Fan J, Stucky G D. One-step one-phase synthesis of monodisperse Noble-Metallic nanoparticles and their colloidal crystals [J]. Journal of the American Chemical Society, 2006, 128(20): 6550-1.
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    Brust M, Walker M, Bethell D, et al. Synthesis of thiol-derivatised gold nanoparticles in a two-phase Liquid-Liquid system [J]. Journal of the Chemical Society, Chemical Communications, 1994, 7:801-802.
    [7]
    Sperling R A, Gil P R, Zhang F, et al. Biological applications of gold nanoparticles [J]. Chem Soc Rev, 2008, 37(9): 1 896-1 908.
    [8]
    Wilson R. The use of gold nanoparticles in diagnostics and detection [J]. Chemical Society Reviews, 2008, 37(9): 2 028-2 045.
    [9]
    Crooks R M, Zhao M, Sun L, et al. Dendrimer-encapsulated metal nanoparticles: Synthesis, characterization, and applications to catalysis [J]. Accounts Chem Res, 2000, 34(3): 181-190.
    [10]
    Zhao D, Timmons D J, Yuan D Q, et al. Tuning the topology and functionality of metal-organic frameworks by ligand design [J]. Accounts Chem Res, 2011, 44(2): 123-133.
    [11]
    Love J C, Estroff L A, Kriebel J K, et al. Self-assembled monolayers of thiolates on metals as a form of nanotechnology [J]. Chem Rev, 2005, 105(4): 1 103-1 169.
    [12]
    Zhang P, Sham T K. X-Ray studies of the structure and electronic behavior of alkanethiolate-capped gold nanoparticles: The interplay of size and surface effects[J]. Physical Review Letters, 2003, 90(24): 245502.
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    [1]
    Giljohann D A, Seferos D S, Daniel W L, et al. Gold nanoparticles for biology and medicine [J]. Angewandte Chemie International Edition, 2010, 49(19): 3 280-3 294.
    [2]
    Daniel M C, Astruc D. Gold nanoparticles: Assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology [J]. Chem Rev, 2003, 104(1): 293-346.
    [3]
    Rosi N L, Mirkin C A. Nanostructures in biodiagnostics [J]. Chem Rev, 2005, 105(4): 1 547-1 562.
    [4]
    Talapin D V, Lee J S, Kovalenko M V, et al. Prospects of colloidal nanocrystals for electronic and optoelectronic applications [J]. Chem Rev, 2009, 110(1): 389-458.
    [5]
    Zheng N, Fan J, Stucky G D. One-step one-phase synthesis of monodisperse Noble-Metallic nanoparticles and their colloidal crystals [J]. Journal of the American Chemical Society, 2006, 128(20): 6550-1.
    [6]
    Brust M, Walker M, Bethell D, et al. Synthesis of thiol-derivatised gold nanoparticles in a two-phase Liquid-Liquid system [J]. Journal of the Chemical Society, Chemical Communications, 1994, 7:801-802.
    [7]
    Sperling R A, Gil P R, Zhang F, et al. Biological applications of gold nanoparticles [J]. Chem Soc Rev, 2008, 37(9): 1 896-1 908.
    [8]
    Wilson R. The use of gold nanoparticles in diagnostics and detection [J]. Chemical Society Reviews, 2008, 37(9): 2 028-2 045.
    [9]
    Crooks R M, Zhao M, Sun L, et al. Dendrimer-encapsulated metal nanoparticles: Synthesis, characterization, and applications to catalysis [J]. Accounts Chem Res, 2000, 34(3): 181-190.
    [10]
    Zhao D, Timmons D J, Yuan D Q, et al. Tuning the topology and functionality of metal-organic frameworks by ligand design [J]. Accounts Chem Res, 2011, 44(2): 123-133.
    [11]
    Love J C, Estroff L A, Kriebel J K, et al. Self-assembled monolayers of thiolates on metals as a form of nanotechnology [J]. Chem Rev, 2005, 105(4): 1 103-1 169.
    [12]
    Zhang P, Sham T K. X-Ray studies of the structure and electronic behavior of alkanethiolate-capped gold nanoparticles: The interplay of size and surface effects[J]. Physical Review Letters, 2003, 90(24): 245502.
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