pH-Induced transformation of ligated Au 25 to brighter Au 23 nanoclusters

Journal article

Waszkielewicz, Magdalena, Olesiak-Banska, Joanna, Comby-Zerbino, Clothilde, Bertorelle, Franck, Dagany, Xavier, Bansal, Ashu K, Sajjad, T, Samuel, Ifor DW, Sanader, Zeljka and Rozycka, Miroslawa (2018). pH-Induced transformation of ligated Au 25 to brighter Au 23 nanoclusters. Nanoscale. 10 (24), pp. 11335-11341. https://doi.org/10.1039/C8NR00660A
AuthorsWaszkielewicz, Magdalena, Olesiak-Banska, Joanna, Comby-Zerbino, Clothilde, Bertorelle, Franck, Dagany, Xavier, Bansal, Ashu K, Sajjad, T, Samuel, Ifor DW, Sanader, Zeljka and Rozycka, Miroslawa
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.

Year2018
JournalNanoscale
Journal citation10 (24), pp. 11335-11341
PublisherRoyal Society of Chemistry (RSC)
ISSN2040-3364
Digital Object Identifier (DOI)https://doi.org/10.1039/C8NR00660A
Publication dates
Print04 Apr 2018
Online04 Apr 2018
Publication process dates
Accepted03 Apr 2018
Deposited04 Feb 2020
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