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Quantitative analysis of gold nanoparticles from synchrotron data by means of least-squares techniques

Least-squares analysis of gold nanoparticles

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Abstract.

Powder samples of thiol-capped gold nanoparticles in the size range of 2-4 nm were quantitatively characterized by means of synchrotron X-ray diffraction data, with respect to their structure, size and strain distributions. A novel Rietveld-like approach was applied, refining domain size distribution, strain-size dependence and structure type concentrations. Three structure types (cuboctahedron, icosahedron, decahedron) were considered in this analysis and a detail study of the strain content was performed by comparing different models. The results showed a strong influence of the strain model and a careful analysis is presented. Final domain size and strain distributions agree well with the existence of both single-domain and imperfectly formed or multi-domain nanoparticles, but the final strain profiles seem to be mostly related to the different degree of structural perfection at different sizes as a result of the synthesis process. The present work represents an important step towards the development of robust methods to determine strain profiles in nanosystems, aiming to fulfill the description of these important but complex systems.

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Authors and Affiliations

  1. Consiglio Nazionale delle Ricerche, Istituto di Cristallografia (CNR-IC), Via Amendola 122/O, 70125, Bari, Italy

    A. Cervellino, C. Giannini & A. Guagliardi

  2. Laboratorio Nacional de Luz Sincrotron (LNLS), C.P. 6192, 13084-971, Campinas SP, Brazil

    D. Zanchet

Authors
  1. A. Cervellino
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  2. C. Giannini
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  3. A. Guagliardi
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  4. D. Zanchet
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Corresponding author

Correspondence to A. Guagliardi.

Additional information

Received: 23 June 2004, Published online: 5 November 2004

PACS:

81.07.-b Nanoscale materials and structures: fabrication and characterization - 61.10.Nz X-ray diffraction - 61.72.Dd Experimental determination of defects by diffraction and scattering

A. Cervellino: On leave. Presently at: Paul Scherrer Institute, 5232 Villigen, Switzerland

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Cervellino, A., Giannini, C., Guagliardi, A. et al. Quantitative analysis of gold nanoparticles from synchrotron data by means of least-squares techniques. Eur. Phys. J. B 41, 485–493 (2004). https://doi.org/10.1140/epjb/e2004-00342-3

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  • DOI: https://doi.org/10.1140/epjb/e2004-00342-3

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