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Title: Anomalous phonon relaxation in Au 333 (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 Au 333 (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 Au 333 (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 Au 333 (SR) 79 . This work is expected to stimulate future work on the transition-size regime of nanometals and discovery of behavior of nascent plasmons.

Authors:
ORCiD logo; ORCiD logo; ; ; ORCiD logo; ; ORCiD logo
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1526767
Grant/Contract Number:  
SC0012704; DE FG0203ER15476
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 27; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English

Citation Formats

Higaki, Tatsuya, Zhou, Meng, He, Guiying, House, Stephen D., Sfeir, Matthew Y., Yang, Judith C., and Jin, Rongchao. Anomalous phonon relaxation in Au 333 (SR) 79 nanoparticles with nascent plasmons. United States: N. p., 2019. Web. doi:10.1073/pnas.1904337116.
Higaki, Tatsuya, Zhou, Meng, He, Guiying, House, Stephen D., Sfeir, Matthew Y., Yang, Judith C., & Jin, Rongchao. Anomalous phonon relaxation in Au 333 (SR) 79 nanoparticles with nascent plasmons. United States. doi:10.1073/pnas.1904337116.
Higaki, Tatsuya, Zhou, Meng, He, Guiying, House, Stephen D., Sfeir, Matthew Y., Yang, Judith C., and Jin, Rongchao. Mon . "Anomalous phonon relaxation in Au 333 (SR) 79 nanoparticles with nascent plasmons". United States. doi:10.1073/pnas.1904337116.
@article{osti_1526767,
title = {Anomalous phonon relaxation in Au 333 (SR) 79 nanoparticles with nascent plasmons},
author = {Higaki, Tatsuya and Zhou, Meng and He, Guiying and House, Stephen D. and Sfeir, Matthew Y. and Yang, Judith C. and Jin, Rongchao},
abstractNote = {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 333 (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 Au 333 (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 Au 333 (SR) 79 . This work is expected to stimulate future work on the transition-size regime of nanometals and discovery of behavior of nascent plasmons.},
doi = {10.1073/pnas.1904337116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 27,
volume = 116,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1073/pnas.1904337116

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Works referenced in this record:

Plasmonics for improved photovoltaic devices
journal, February 2010

  • Atwater, Harry A.; Polman, Albert
  • Nature Materials, Vol. 9, Issue 3, p. 205-213
  • DOI: 10.1038/nmat2629