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Issue 24, 2018
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pH-Induced transformation of ligated Au25 to brighter Au23 nanoclusters

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Abstract

Thiolate-protected gold nanoclusters have recently attracted considerable attention due to their size-dependent luminescence characterized by a long lifetime and large Stokes shift. However, the optimization of nanocluster properties such as the luminescence quantum yield is still a challenge. We report here the transformation of Au25Capt18 (Capt labels captopril) nanoclusters occurring at low pH and yielding a product with a much increased luminescence quantum yield which we have identified as Au23Capt17. We applied a simple method of treatment with HCl to accomplish this transformation and we characterized the absorption and emission of the newly created ligated nanoclusters as well as their morphology. Based on DFT calculations we show which Au nanocluster size transformations can lead to highly luminescent species such as Au23Capt17.

Graphical abstract: pH-Induced transformation of ligated Au25 to brighter Au23 nanoclusters

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Publication details

The article was received on 23 Jan 2018, accepted on 03 Apr 2018 and first published on 04 Apr 2018


Article type: Paper
DOI: 10.1039/C8NR00660A
Citation: Nanoscale, 2018,10, 11335-11341
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    pH-Induced transformation of ligated Au25 to brighter Au23 nanoclusters

    M. Waszkielewicz, J. Olesiak-Banska, C. Comby-Zerbino, F. Bertorelle, X. Dagany, A. K. Bansal, M. T. Sajjad, I. D. W. Samuel, Z. Sanader, M. Rozycka, M. Wojtas, K. Matczyszyn, V. Bonacic-Koutecky, R. Antoine, A. Ozyhar and M. Samoc, Nanoscale, 2018, 10, 11335
    DOI: 10.1039/C8NR00660A

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