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Synthesis of Near-Infrared Emitting Gold Nanoclusters for Biological Applications
Published on: March 22, 2020
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Gold-bismuth clusters.
1Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Escolar s/n. Ciudad Universitaria , P.O. Box 70-360, Coyoacán 04510, México DF, México.
The Journal of Physical Chemistry. A
|June 26, 2014
Summary
Theoretical studies reveal that adding bismuth to gold clusters (Au_nBi_m) alters their 3D structures and electron-donating properties. These mixed clusters exhibit unique characteristics compared to pure gold or bismuth clusters.
Area of Science:
- Computational Chemistry
- Materials Science
- Nanotechnology
Background:
- The properties of metal clusters are highly dependent on their size and composition.
- Theoretical studies are crucial for understanding structure-property relationships in metal clusters.
- Gold (Au) and Bismuth (Bi) clusters exhibit distinct electronic and structural characteristics.
Purpose of the Study:
- To investigate the optimized structures of gold-bismuth (AunBim) clusters.
- To determine the electron donor-acceptor properties of AunBim clusters.
- To understand how bismuth incorporation influences gold cluster properties.
Main Methods:
- Density Functional Theory (DFT) calculations were employed.
- Optimized structures for AunBim clusters (n + m = 2-7, 20) were obtained.
- Electron donor-acceptor capabilities were analyzed.
Main Results:
- Ground states of gold clusters up to seven atoms are planar; bismuth addition induces 3D structures.
- Bismuth clusters are superior electron donors and weaker acceptors compared to gold clusters.
- Mixed AunBim clusters display intermediate electron donor-acceptor properties, with no direct correlation to Bi atom count.
Conclusions:
- Bismuth incorporation significantly modifies the geometry, stability, and properties of gold clusters.
- The presence of bismuth may enhance the reactivity of gold clusters, warranting further investigation.
- AunBim clusters offer more significant potential for property modification than pure gold clusters.
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