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pH-induced transformation of captopril-capped Au25 to brighter Au23 nanoclusters

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 transformation of Au25Capt18 (Capt labels captopril) nanoclusters occurring at low pH and yielding a product with 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 nanoclusters as well as their morphology. Based on DFT calculations we show which Au nanocluster size transformations can lead to the highly luminescent species such as Au23Capt17.

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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, Accepted Manuscript
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    pH-induced transformation of captopril-capped Au25 to brighter Au23 nanoclusters

    M. Waszkielewicz, J. Olesiak-Banska, C. Zerbino, F. Bertorelle, X. dagany, A. K. Bansal, M. T. Sajjad, I. D. W. Samuel, Z. Sanader, M. Rozycka, M. Wojtas, K. Matczyszyn, V. Bonačić-Koutecký, R. Antoine, A. Ożyhar and M. Samoc, Nanoscale, 2018, Accepted Manuscript , DOI: 10.1039/C8NR00660A

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