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A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions
Published on: February 5, 2016
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Interaction of Gold Clusters with a Hydroxylated Surface
De-En Jiang, Steven H Overbury, Sheng Dai1
1§Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States.
The Journal of Physical Chemistry Letters
|August 22, 2015
Summary
Gold nanoclusters strongly bind to hydroxylated surfaces, preventing sintering. This interaction enhances low-temperature carbon monoxide oxidation activity, crucial for catalysis.
Area of Science:
- Materials Science
- Surface Chemistry
- Computational Chemistry
Background:
- Gold nanoclusters are vital catalysts, but their stability is limited by sintering.
- Understanding nanoparticle-surface interactions is key to designing stable and active catalysts.
Purpose of the Study:
- To investigate the interaction mechanism between gold nanoclusters and a hydroxylated magnesium hydroxide surface.
- To elucidate the factors governing gold nanocluster stability and catalytic activity.
Main Methods:
- Density Functional Theory (DFT) calculations were employed.
- A local basin-hopping technique was utilized for global minimum structure searching.
Main Results:
- A strong interaction was identified between gold nanoclusters and surface hydroxyl groups.
- Short bonds formed between edge gold atoms and oxygen atoms of hydroxyl groups.
- This interaction is predicted to be common on hydroxylated support surfaces.
Conclusions:
- The strong binding interaction prevents gold nanocluster sintering.
- This enhanced stability contributes to improved low-temperature carbon monoxide oxidation activity.
- The findings offer insights into designing robust gold-based catalysts.
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