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Title: Anomalous phonon relaxation in Au333(SR)79 nanoparticles with nascent plasmons

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Research on plasmons of gold nanoparticles has gained broad interest in nanoscience. However, ultrasmall sizes near the metal-to-nonmetal transition regime have not been explored until recently due to major synthetic difficulties. Herein, intriguing electron dynamics in this size regime is observed in atomically precise Au333(SR)79 nanoparticles. Femtosecond transient-absorption spectroscopy reveals an unprecedented relaxation process of 4–5 ps—a fast phonon–phonon relaxation process, together with electron–phonon coupling (~1 ps) and normal phonon–phonon coupling (>100 ps) processes. Furthermore, three types of –R capped Au333(SR)79 all exhibit two plasmon-bleaching signals independent of the –R group as well as solvent, indicating plasmon splitting and quantum effect in the ultrasmall core of Au333(SR)79. This work is expected to stimulate future work on the transition-size regime of nanometals and discovery of behavior of nascent plasmons.

Research Organization:
Univ. of Illinois at Urbana-Champaign, IL (United States); Brookhaven National Laboratory (BNL), Upton, NY (United States). Center for Functional Nanomaterials (CFN)
Sponsoring Organization:
National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); USDOE Office of Science (SC), Basic Energy Sciences (BES); Hitachi High Technologies Corporation
Grant/Contract Number:
FG02-03ER15476; SC0012704; CHE-1534630
OSTI ID:
1526767
Alternate ID(s):
OSTI ID: 1609449
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 116, Issue 27; ISSN 0027-8424
Publisher:
National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 25 works
Citation information provided by
Web of Science

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Figures / Tables (4)