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Quantized double layer charging of Au130(SR)50 nanomolecules
Vijay Reddy Jupally1, Jacob G Thrasher, Amala Dass
1Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677, USA. amal@olemiss.edu.
The Analyst
|March 8, 2014
Summary
Quantized double layer (QDL) charging was observed in Au130(SR)50 nanomolecules for the first time, revealing 13 electron charging events and an electrochemical gap. This finding advances understanding of gold nanomolecule electrochemistry and catalysis.
Area of Science:
- Electrochemistry
- Nanomaterials Science
- Physical Chemistry
Background:
- Quantized double layer (QDL) charging is a phenomenon observed in specific gold nanomolecules.
- Previous research focused on larger gold nanomolecules like Au144(SR)60 and Au225(SR)75.
- Understanding QDL charging is crucial for exploring the unique electrochemical properties of nanomaterials.
Purpose of the Study:
- To report for the first time the quantized double layer (QDL) charging of the Au130(SR)50 nanomolecule.
- To investigate the electrochemical properties, including charging events and electrochemical gap, of Au130(SR)50.
- To compare the behavior of Au130(SR)50 with other magic-sized gold nanomolecules.
Main Methods:
- Differential pulse voltammetry was employed to study the electrochemical behavior of Au130(SR)50.
- Electrochemical data analysis was performed to determine charging events, electrochemical gap, and capacitance.
- Comparative analysis with other gold nanomolecules was conducted.
Main Results:
- Quantized double layer (QDL) charging was successfully demonstrated in Au130(SR)50 nanomolecules.
- Thirteen distinct oxidation-reduction waves, indicative of single electron charging, were observed.
- A significant electrochemical gap of approximately 450 mV was determined for Au130(SR)50.
- The calculated HOMO-LUMO gap based on charging energy was found to be 200 mV.
- Capacitance of the Au130(SR)50 nanomolecule was determined through data analysis.
Conclusions:
- Au130(SR)50 exhibits quantized double layer (QDL) charging behavior, similar to larger gold nanomolecules.
- The observed electrochemical gap and charging events provide insights into the electronic structure of this nanomolecule.
- The findings support the transition from molecule-like to bulk metal behavior with increasing gold nanomolecule size.
- Gold nanomolecules with these electrochemical properties hold significant potential for applications in catalysis.
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