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Ag-Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution.

Authors
  • Shahjamali, Mohammad M1, 2, 3
  • Zhou, Yong1, 4
  • Zaraee, Negin1, 3
  • Xue, Can2
  • Wu, Jinsong5
  • Large, Nicolas1
  • McGuirk, C Michael1
  • Boey, Freddy2
  • Dravid, Vinayak5
  • Cui, Zhifeng4
  • Schatz, George C1
  • Mirkin, Chad A1, 5
  • 1 Department of Chemistry and International Institute for Nanotechnology, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States. , (United States)
  • 2 School of Materials Science and Engineering, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798. , (Singapore)
  • 3 Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University , 29 Oxford Street, Cambridge, Massachusetts 02138, United States. , (United States)
  • 4 Department of Physics, Anhui Normal University , 1 Beijing East Road, Wuhu, Anhui 241000, China. , (China)
  • 5 Department of Materials Science and Engineering and NUANCE Center, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208, United States. , (United States)
Type
Published Article
Journal
ACS Nano
Publisher
American Chemical Society
Publication Date
May 24, 2016
Volume
10
Issue
5
Pages
5362–5373
Identifiers
DOI: 10.1021/acsnano.6b01532
PMID: 27148792
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

Recently, Ag-Ag2S hybrid nanostructures have attracted a great deal of attention due to their enhanced chemical and thermal stability, in addition to their morphology- and composition-dependent tunable local surface plasmon resonances. Although Ag-Ag2S nanostructures can be synthesized via sulfidation of as-prepared anisotropic Ag nanoparticles, this process is poorly understood, often leading to materials with anomalous compositions, sizes, and shapes and, consequently, optical properties. In this work, we use theory and experiment to investigate the structural and plasmonic evolution of Ag-Ag2S nanoprisms during the sulfidation of Ag precursors. The previously observed red-shifted extinction of the Ag-Ag2S hybrid nanoprism as sulfidation occurs contradicts theoretical predictions, indicating that the reaction does not just occur at the prism tips as previously speculated. Our experiments show that sulfidation can induce either blue or red shifts in the extinction of the dipole plasmon mode, depending on reaction conditions. By elucidating the correlation with the final structure and morphology of the synthesized Ag-Ag2S nanoprisms, we find that, depending on the reaction conditions, sulfidation occurs on the prism tips and/or the (111) surfaces, leading to a core(Ag)-anisotropic shell(Ag2S) prism nanostructure. Additionally, we demonstrate that the direction of the shift in the dipole plasmon is a function of the relative amounts of Ag2S at the prism tips and Ag2S shell thickness around the prism.

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