Ab initio molecular dynamics studies of Au38(SR)24 isomers under heating
Juarez Mosqueda, R., Malola, S., & Häkkinen, H. (2019). Ab initio molecular dynamics studies of Au38(SR)24 isomers under heating. European Physical Journal D, 73(3), Article 62. https://doi.org/10.1140/epjd/e2019-90441-5
Julkaistu sarjassa
European Physical Journal DPäivämäärä
2019Tekijänoikeudet
© The Author(s) 2019
Despite the great success in achieving monodispersity for a great number of monolayer-protected clusters, to date little is known about the dynamics of these ultra-small metal systems, their decomposition mechanisms, and the energy that separates their structural isomers. In this work, we use density functional theory (DFT) to calculate and compare the ground state energy and the Born-Oppenheimer molecular dynamics of two well-known Au 38 (SCH 2 CH 2 Ph) 24 nanocluster isomers. The aim is to shed light on the energy difference between the two clusters isomers and analyze their decomposition mechanisms triggered by high temperatures. The results demonstrate that the energy that separates the two isomers is of the same order of magnitude as the energy difference between the fcc and hcp phases of bulk gold reported earlier. Moreover, the MD simulations show disordering and eventual fragmentation of the cluster structures at high temperature which seem to proceed via spontaneous formation of Au x (SR) y polymeric chains. Hence, these results greatly contribute to understanding the possible decomposition mechanism, stability and robustness of existing and new monolayer-protected clusters.
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Julkaisija
SpringerISSN Hae Julkaisufoorumista
1434-6060Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/28960174
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Rahoittaja(t)
Suomen AkatemiaRahoitusohjelmat(t)
Akatemiaprofessorin tutkimuskulut, SALisätietoja rahoituksesta
Open access funding provided by University of Jyväskylä (JYU). This work is supported by the Academy of Finland (Project 294217 and H.H. Academy Professorship). The computational resources were provided by CSC-the Finnish IT Center for Science in Espoo, Finland. We thank Satu Mustalahti for useful discussions.Lisenssi
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