Unraveling the Causes of the Instability of Aun(SR)x Nanoclusters on Au(111)

Properties of small metal nanoclusters rely on the exact arrangement of a few atoms. Minor structural changes can rapidly destabilize them, leading to disintegration. Here, we evaluate the energetic factors accounting for the stabilization and integrity of thiolate-capped gold nanoclusters (AuNCs)....

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Autores principales: Carro, Pilar, Azofra, Luis Miguel, Albrecht, Tim, Salvarezza, Roberto Carlos, Pensa, Evangelina
Formato: Articulo
Lenguaje:Inglés
Publicado: 2021
Materias:
Química
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/124429
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-124429
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Química
spellingShingle Química
Carro, Pilar
Azofra, Luis Miguel
Albrecht, Tim
Salvarezza, Roberto Carlos
Pensa, Evangelina
Unraveling the Causes of the Instability of Aun(SR)x Nanoclusters on Au(111)
topic_facet Química
description Properties of small metal nanoclusters rely on the exact arrangement of a few atoms. Minor structural changes can rapidly destabilize them, leading to disintegration. Here, we evaluate the energetic factors accounting for the stabilization and integrity of thiolate-capped gold nanoclusters (AuNCs). We found that the core-cohesive and shell-binding energies regulate the disintegration process on a solid substrate by investigating the different energetic contributions, as shown here in a combined experimental and theoretical study. As the AuNC size increases, the core-cohesive energy and shell stability (imposed by S-Au and hydrocarbon chain interactions) counterbalance the AuNC− substrate interaction and slow down the AuNC disintegration. Thus, the decomposition can not only be understood in terms of desorption and transfer of the capping molecules to the support substrate but conversely, as a whole where ligand and core interactions play a role. Taken together, our experimental and theoretical results serve as guidelines for enhancing the stability of AuNCs on solid-state devices, a key point for reliable nanotechnological applications such as heterogeneous catalysis and sensing.
format Articulo
Articulo
author Carro, Pilar
Azofra, Luis Miguel
Albrecht, Tim
Salvarezza, Roberto Carlos
Pensa, Evangelina
author_facet Carro, Pilar
Azofra, Luis Miguel
Albrecht, Tim
Salvarezza, Roberto Carlos
Pensa, Evangelina
author_sort Carro, Pilar
title Unraveling the Causes of the Instability of Aun(SR)x Nanoclusters on Au(111)
title_short Unraveling the Causes of the Instability of Aun(SR)x Nanoclusters on Au(111)
title_full Unraveling the Causes of the Instability of Aun(SR)x Nanoclusters on Au(111)
title_fullStr Unraveling the Causes of the Instability of Aun(SR)x Nanoclusters on Au(111)
title_full_unstemmed Unraveling the Causes of the Instability of Aun(SR)x Nanoclusters on Au(111)
title_sort unraveling the causes of the instability of aun(sr)x nanoclusters on au(111)
publishDate 2021
url http://sedici.unlp.edu.ar/handle/10915/124429
work_keys_str_mv AT carropilar unravelingthecausesoftheinstabilityofaunsrxnanoclustersonau111
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AT albrechttim unravelingthecausesoftheinstabilityofaunsrxnanoclustersonau111
AT salvarezzarobertocarlos unravelingthecausesoftheinstabilityofaunsrxnanoclustersonau111
AT pensaevangelina unravelingthecausesoftheinstabilityofaunsrxnanoclustersonau111
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