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

ABSTRACT: 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. 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.

SUBMITTER: Higaki T 

PROVIDER: S-EPMC6613166 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Anomalous phonon relaxation in Au<sub>333</sub>(SR)<sub>79</sub> nanoparticles with nascent plasmons.

Higaki Tatsuya T   Zhou Meng M   He Guiying G   House Stephen D SD   Sfeir Matthew Y MY   Yang Judith C JC   Jin Rongchao R  

Proceedings of the National Academy of Sciences of the United States of America 20190617 27

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 Au<sub>333</sub>(SR)<sub>79</sub> nanoparticles. Femtosecond transient-absorption spectroscopy reveals an unprecedented relaxation process of 4-5 ps-a fast phonon-phonon relaxati  ...[more]

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