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Nanoscale phase separation in coated Ag nanoparticles.

Yuri Antonio Diaz-Fernandez1, Piersandro Pallavicini, Luca Pasotti

  • 1inLAB, Inorganic Nanochemistry Laboratory, Dipartimento di Chimica, Università di Pavia, Viale Taramelli, 1227100 Pavia, Italy.

Nanoscale
|September 1, 2011
PubMed
Summary

This study reveals that silver nanoparticles (Ag NPs) coated with cysteine and glutathione exhibit both cubic and hexagonal crystal structures. These nanoscale materials present a unique phase-separated system within individual grains.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Chemistry

Background:

  • Silver nanoparticles (Ag NPs) are widely investigated for their unique optical and electronic properties.
  • The crystal structure of nanomaterials significantly influences their physical and chemical behavior.
  • Surface capping agents can affect the structural properties of nanoparticles.

Purpose of the Study:

  • To elucidate the crystal structure of cysteine and glutathione capped Ag NPs.
  • To investigate the coexistence of different crystal phases within individual Ag NPs.
  • To determine the influence of capping agents on the structural phases of Ag NPs.

Main Methods:

  • Transmission Electron Microscopy (TEM) for nanoscale imaging.
  • Synchrotron X-ray Diffraction (XRD) for crystallographic analysis.

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  • Pair Distribution Function (PDF) analysis for atomic-level structural insights.

    • Main Results:

    • Observation of both cubic (fcc) and hexagonal (hcp) crystal structures in coated Ag NPs.
    • Demonstration that coated Ag NPs form a nanoscale phase-separated system.
    • Coexistence of fcc and hcp phases within single nanoparticle grains.
    • Estimation of the relative bulk amounts of fcc and hcp phases.

    Conclusions:

    • Cysteine and glutathione capping leads to the formation of dual-phase Ag NPs.
    • The nanoscale phase separation within Ag NPs is a key structural characteristic.
    • A potential correlation between capping agents and the observed fcc/hcp phase ratio is proposed.