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Title: Electronic relaxation dynamics in [Au25(SR)18]-1 (R = CH3, C2H5, C3H7, MPA, PET) thiolate-protected nanoclusters

Journal Article · · Physical Chemistry Chemical Physics. PCCP
DOI:https://doi.org/10.1039/c9cp04039k· OSTI ID:1802321

Here we investigate the excited electron dynamics in [Au25(SR)18]-1 (R = CH3, C2H5, C3H7, MPA, PET) [MPA = mercaptopropanoic acid, PET = phenylethylthiol] nanoparticles to understand how different ligands affect the excited state dynamics in this system. The population dynamics of the core and higher excited states lying in the energy range 0.00–2.20 eV are studied using a surface hopping method with decoherence correction in a real-time DFT approach. All of the ligated clusters follow a similar trend in decay for the core states (S1–S6). The observed time constants are on the picosecond time scale (2–19 ps), which agrees with the experimental time scale, and this study confirms that the time constants observed experimentally could originate from core-to-core transitions and not from core-to-semiring transitions. In the presence of higher excited states, R = H, CH3, C2H5, C3H7, and PET demonstrate similar relaxations trends whereas R = MPA shows slightly different relaxation of the core states due to a smaller gap between the LUMO+1 and LUMO+2 gap in its electronic structure. The S1 (HOMO → LUMO) state gives the slowest decay in all ligated clusters, while S7 has a relatively long decay. Furthermore, separate electron and hole relaxations were performed on the [Au25(SCH3)18]-1 nanocluster to understand how independent electron and hole relaxations contribute to the overall relaxation dynamics.

Research Organization:
Kansas State Univ., Manhattan, KS (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Science Foundation (NSF)
Grant/Contract Number:
SC0012273; AC02-05CH11231; CHE-1507909; CHE-1726332; CNS-1006860; EPS-1006860; EPS-0919443; ACI-1053575
OSTI ID:
1802321
Alternate ID(s):
OSTI ID: 1601509
Journal Information:
Physical Chemistry Chemical Physics. PCCP, Vol. 22, Issue 9; ISSN 1463-9076
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 14 works
Citation information provided by
Web of Science

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