Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution

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 sulfidati...

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Main Authors: Shahjamali, Mohammad M., Zhou, Yong, Zaraee, Negin, Xue, Can, Wu, Jinsong, Large, Nicolas, McGuirk, C. Michael, Boey, Freddy, Dravid, Vinayak, Cui, Zhifeng, Schatz, George C., Mirkin, Chad A.
Other Authors: School of Materials Science & Engineering
Format: Article
Language:English
Published: 2017
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Online Access:https://hdl.handle.net/10356/84975
http://hdl.handle.net/10220/42086
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-849752023-07-14T15:45:18Z Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution Shahjamali, Mohammad M. Zhou, Yong Zaraee, Negin Xue, Can Wu, Jinsong Large, Nicolas McGuirk, C. Michael Boey, Freddy Dravid, Vinayak Cui, Zhifeng Schatz, George C. Mirkin, Chad A. School of Materials Science & Engineering anisotropic reaction anisotropic core−shell nanoparticles 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. ASTAR (Agency for Sci., Tech. and Research, S’pore) Accepted version 2017-02-10T08:20:54Z 2019-12-06T15:54:43Z 2017-02-10T08:20:54Z 2019-12-06T15:54:43Z 2016 Journal Article Shahjamali, M. M., Zhou, Y., Zaraee, N., Xue, C., Wu, J., Large, N., et al. (2016). Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution. ACS Nano, 10(5), 5362-5373. 1936-0851 https://hdl.handle.net/10356/84975 http://hdl.handle.net/10220/42086 10.1021/acsnano.6b01532 en ACS Nano © 2016 American Chemical Society. This is the author created version of a work that has been peer reviewed and accepted for publication by ACS Nano, American Chemical Society. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1021/acsnano.6b01532]. 41 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic anisotropic reaction
anisotropic core−shell nanoparticles
spellingShingle anisotropic reaction
anisotropic core−shell nanoparticles
Shahjamali, Mohammad M.
Zhou, Yong
Zaraee, Negin
Xue, Can
Wu, Jinsong
Large, Nicolas
McGuirk, C. Michael
Boey, Freddy
Dravid, Vinayak
Cui, Zhifeng
Schatz, George C.
Mirkin, Chad A.
Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution
description 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.
author2 School of Materials Science & Engineering
author_facet School of Materials Science & Engineering
Shahjamali, Mohammad M.
Zhou, Yong
Zaraee, Negin
Xue, Can
Wu, Jinsong
Large, Nicolas
McGuirk, C. Michael
Boey, Freddy
Dravid, Vinayak
Cui, Zhifeng
Schatz, George C.
Mirkin, Chad A.
format Article
author Shahjamali, Mohammad M.
Zhou, Yong
Zaraee, Negin
Xue, Can
Wu, Jinsong
Large, Nicolas
McGuirk, C. Michael
Boey, Freddy
Dravid, Vinayak
Cui, Zhifeng
Schatz, George C.
Mirkin, Chad A.
author_sort Shahjamali, Mohammad M.
title Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution
title_short Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution
title_full Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution
title_fullStr Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution
title_full_unstemmed Ag–Ag2S Hybrid Nanoprisms: Structural versus Plasmonic Evolution
title_sort ag–ag2s hybrid nanoprisms: structural versus plasmonic evolution
publishDate 2017
url https://hdl.handle.net/10356/84975
http://hdl.handle.net/10220/42086
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