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Issue 10, 2014
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NIR electrochemiluminescence from Au25 nanoclusters facilitated by highly oxidizing and reducing co-reactant radicals

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Abstract

The well-defined electrochemical features and optical properties of the negatively charged Au25 clusters (Au25) provide opportunities for a photoelectrochemical study by means of electrochemiluminescence (ECL) technique. Under annihilation conditions where the Au25 is electrochemically pumped to its various oxidized and reduced forms showed no appreciable ECL light emission, due presumably to the short lifetime of the electrogenerated intermediates and their reactivity. Interestingly, in either Au25/tri-n-propylamine (TPrA) or Au25/benzoyl peroxide (BPO) co-reactant systems, the correspondingly highly reducing and oxidizing intermediates electrogenerated from TPrA and BPO lead to light emission at 950 and 890 nm in near-infrared (NIR) region. The ECL in the presence of various concentrations of TPrA (6.3, 12.5, 25, 50, 100 and 200 mM) and BPO (2.5, 5, 25 and 50 mM) was explicitly investigated. Along with the concentration dependence study, spooling ECL spectroscopy provided insight into the ECL mechanisms. Notably, while the Au25* is the main light emission source with BPO, ECL in the presence of TPrA is attributed to emissions from the Au25*, Au250* and Au25+* that are tuneable by means of the applied potential and TPrA concentration.

Graphical abstract: NIR electrochemiluminescence from Au25− nanoclusters facilitated by highly oxidizing and reducing co-reactant radicals

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Publication details

The article was received on 14 Apr 2014, accepted on 04 Jun 2014 and first published on 16 Jun 2014


Article type: Edge Article
DOI: 10.1039/C4SC01086H
Author version available: Download Author version (PDF)
Citation: Chem. Sci., 2014,5, 3814-3822
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    NIR electrochemiluminescence from Au25 nanoclusters facilitated by highly oxidizing and reducing co-reactant radicals

    M. Hesari, M. S. Workentin and Z. Ding, Chem. Sci., 2014, 5, 3814
    DOI: 10.1039/C4SC01086H

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