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Programmable Metal Nanoclusters with Atomic Precision.

Yingwei Li1, Meng Zhou1, Rongchao Jin1

  • 1Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA.

Advanced Materials (Deerfield Beach, Fla.)
|May 13, 2021
PubMed
Summary
This summary is machine-generated.

Atomically precise nanochemistry enables programmable control over nanoparticle structure. Gold-thiolate nanocluster kernel structure significantly influences optical properties and energy gaps, offering new design possibilities.

Keywords:
Au-thiolate nanoclusteratom packingatomically precise nanoclusterelectronic and optical propertiesprogrammable structure

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Area of Science:

  • Nanochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Atomically precise nanochemistry allows for controlled synthesis of nanoclusters (NCs) with defined sizes (1-3 nm).
  • X-ray crystallography has enabled the complete structural determination of gold-thiolate nanoclusters (Aun(SR)m), including their core, interface, and ligand shell.
  • Ultrasmall gold nanoparticles exhibit quantum confinement effects impacting their optical properties.

Purpose of the Study:

  • To investigate the role of atomic packing and crystallographic structure of the metal kernel in determining the optical properties and energy gap (Eg) of gold nanoclusters.
  • To compare the influence of kernel structure versus surface motifs on the electronic and optical characteristics of gold nanoclusters.
  • To explore the relationship between nanoparticle size, kernel structure, and quantum confinement effects.

Main Methods:

  • Synthesis of atomically precise gold-thiolate nanoclusters (Aun(SR)m).
  • X-ray crystallography for complete structural elucidation.
  • Spectroscopic analysis to study optical absorption properties and determine energy gaps (Eg).
  • Comparative analysis of isomeric and series nanoclusters with varying kernel or motif structures.

Main Results:

  • Gold-thiolate nanoclusters possess a defined structure comprising a metal kernel, Au-S interface, and ligand shell.
  • The crystallographic structure of the metal kernel is a primary determinant of optical properties and Eg.
  • Icosahedral kernels lead to deviations from general trends, exhibiting smaller Eg compared to fcc or decahedral kernels of similar size.
  • Kernel structure plays a more significant role than surface motifs in dictating NC properties.

Conclusions:

  • Programmable control over the kernel's atomic packing in gold nanoclusters allows tuning of their optical properties.
  • The crystallographic arrangement within the nanocluster core is crucial for understanding and predicting their electronic behavior.
  • Future research can leverage this understanding for designing novel nanomaterials with tailored optoelectronic functionalities.