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Gold-doped Silver Nanoclusters with Enhanced Photophysical Properties

Abstract

We detail the characterization of atomically precise, luminescent silver and gold bimetallic nanoclusters (Ag and AgAuNCs) grown in the presence of bidentate lipoic acid (LA, the oxidized form) and dihydrolipoic acid (DHLA, the reduced form) ligands. We found that while doping AuNCs with Ag or Cu precursors using up to 50% molar fraction (during growth) did not lead to any PL enhancement, doping of AgNCs with Au resulted in ~six-fold enhancement in the PL emission compared to undoped AgNCs. This change is also reflected in the optical absorption and PL excitation spectra of the gold-doped NCs (AgAuNCs), where a clear blue shift in the absorbance features with respect to the pure AgNCs have been measured. Mass spectroscopic measurements using ESI-MS showed that the AgNCs and Au-doped AgNCs had the compositions Ag29(DHLA)12 and Ag28Au(DHLA)12, respectively. The bimetallic nature of the AgAuNC cores was further supported by X-ray Photoelectron Spectroscopy (XPS) measurements. Data showed that the binding energy of Ag and Au atoms measured from the nanoclusters were shifted with respect to those of the Ag and Au metals. Furthermore, the change in the Ag binding energy was affected by the presence of Au atoms. DOSY-NMR measurements performed on both sets of nanoclusters yielded no change in the hydrodynamic radius measured for either set of NCs when capped with the same ligands.

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Publication details

The article was received on 29 Dec 2017, accepted on 13 Apr 2018 and first published on 17 Apr 2018


Article type: Paper
DOI: 10.1039/C7CP08682B
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Gold-doped Silver Nanoclusters with Enhanced Photophysical Properties

    D. Mishra, V. V. Lobodin, C. Zhang, F. aldeek, E. Lochner and H. Mattoussi, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP08682B

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