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.
| Original language | English |
|---|---|
| Pages (from-to) | 5362-5373 |
| Number of pages | 12 |
| Journal | ACS Nano |
| Volume | 10 |
| Issue number | 5 |
| DOIs | |
| Publication status | Published - May 24 2016 |
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Keywords
- anisotropic core-shell nanoparticles
- anisotropic reaction
- DDA
- discrete dipole approximation
- hybrid nanoplate
- metal-semiconductor
- sulfidation
ASJC Scopus subject areas
- Engineering(all)
- Materials Science(all)
- Physics and Astronomy(all)
Cite this
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.
In: ACS Nano, Vol. 10, No. 5, 24.05.2016, p. 5362-5373.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Ag-Ag2S Hybrid Nanoprisms
T2 - Structural versus Plasmonic Evolution
AU - Shahjamali, Mohammad M.
AU - Zhou, Yong
AU - Zaraee, Negin
AU - Xue, Can
AU - Wu, Jinsong
AU - Large, Nicolas
AU - McGuirk, C. Michael
AU - Boey, Freddy
AU - Dravid, Vinayak
AU - Cui, Zhifeng
AU - Schatz, George C
AU - Mirkin, Chad A.
PY - 2016/5/24
Y1 - 2016/5/24
N2 - 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.
AB - 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.
KW - anisotropic core-shell nanoparticles
KW - anisotropic reaction
KW - DDA
KW - discrete dipole approximation
KW - hybrid nanoplate
KW - metal-semiconductor
KW - sulfidation
UR - http://www.scopus.com/inward/record.url?scp=84973281994&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84973281994&partnerID=8YFLogxK
U2 - 10.1021/acsnano.6b01532
DO - 10.1021/acsnano.6b01532
M3 - Article
VL - 10
SP - 5362
EP - 5373
JO - ACS Nano
JF - ACS Nano
SN - 1936-0851
IS - 5
ER -