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Valence-State-Engineered Electrochemiluminescence from Au Nanoclusters.
Dongyang Wang1, Xuwen Gao1, Jingna Jia1
1School of Chemistry and Chemical Engineering, Shandong University, Jinan250100, China.
ACS Nano
|December 19, 2022
Summary
This study engineered the valence state of gold nanoclusters (AuNCs) to control their electrochemiluminescence (ECL). Adjusting the gold
Area of Science:
- Nanomaterials Science
- Electrochemistry
- Biomolecular Engineering
Background:
- Electrochemical luminescence (ECL) of metal nanoclusters (NCs) is influenced by their intrinsic properties.
- Controlling the valence state of metal elements within NCs offers a pathway to tune their optical and electronic characteristics.
- Bovine serum albumin (BSA)-stabilized gold nanoclusters (AuNCs) are a versatile platform for studying fundamental NC properties.
Purpose of the Study:
- To investigate the intrinsic effects of gold's valence states (Au(0) and Au(I)) on the ECL properties of BSA-AuNCs.
- To develop a valence-state engineering strategy for tunable ECL emission from metal NCs.
- To establish a method for controlling ECL intensity and emission wavelength by manipulating the NC's body element composition.
Main Methods:
- Synthesized BSA-stabilized AuNCs by controlling the reduction of AuCl4- to achieve specific Au(0) and Au(I) ratios.
- Utilized hydrazine (N2H4) as a coreactant to investigate the ECL behavior of the engineered BSA-AuNCs.
- Analyzed ECL emission spectra and intensities at different applied potentials to characterize ECL processes.
Main Results:
- A BSA-AuNCs/N2H4 system exhibited three distinct anodic ECL processes at 0.37 V (ECL-1), 0.85 V (ECL-2), and 1.45 V (ECL-3).
- ECL-1, originating from Au(0) sites via a surface-defect route, was stronger and red-shifted compared to ECL-2 and ECL-3 from Au(I) sites (band-gap route).
- Selective generation and suppression of ECL processes were achieved by tuning the Au(I)/Au(0) ratio, ECL route, and triggering potential.
Conclusions:
- The valence state of the constituent metal element (gold) intrinsically affects the ECL properties of NCs.
- Valence-state engineering provides a powerful strategy for tuning the emission intensity and wavelength of metal NCs.
- This approach enables convenient control over ECL generation, offering potential for advanced sensor and imaging applications.
