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Covalently Binding Atomically Designed Au9 Clusters to Chemically Modified Graphene.

Concha Bosch-Navarro1,2, Zachary P L Laker3, Helen R Thomas4

  • 1Department of Physics, University of Warwick, Coventry, CV4 7AL (UK). concepcion.bosch@uv.es.

Angewandte Chemie (International Ed. in English)
|July 8, 2015
PubMed
Summary
This summary is machine-generated.

Individual gold (Au9) clusters were identified on graphene using atomic-resolution transmission electron microscopy. These gold clusters showed robust covalent attachment, allowing only rotational motion on the sulfur-functionalized surface.

Keywords:
gold nanoparticlesgraphenegraphene oxidenanoclustersthiols

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Understanding the behavior of atomic clusters on surfaces is crucial for catalysis and electronics.
  • Achieving stable immobilization of preformed nanoclusters without aggregation is a significant challenge.

Purpose of the Study:

  • To identify individual gold (Au9) clusters on a sulfur-functionalized graphene surface at atomic resolution.
  • To demonstrate the robust covalent attachment and immobilization of intact Au9 clusters.

Main Methods:

  • Utilizing atomic-resolution transmission electron microscopy (ARTEM) for imaging.
  • Performing comparative analysis between experimental ARTEM images and simulations.
  • Synthesizing Au9 clusters preformed in solution.

Main Results:

  • Successfully identified individual Au9 clusters on the graphene surface.
  • Observed that clusters were covalently attached, preventing dispersion and aggregation.
  • Demonstrated that clusters exhibited rotational motion but no lateral displacement, confirming stable immobilization.

Conclusions:

  • Atomic-resolution TEM provides direct visualization of individual nanoclusters on surfaces.
  • Covalent attachment via sulfur-functionalization ensures robust immobilization of intact Au9 clusters on graphene.
  • The methodology allows for the study of cluster dynamics, such as rotation, on surfaces.