Surface-plasmon mediated photoluminescence from Ag-coated ZnO/MgO core-shell nanowires

Daniel C. Mayo; Claire E. Marvinney; Ephraim S. Bililign; James R. McBride; Richard R. Mu; Richard F. Haglund

doi:10.1016/j.tsf.2013.11.131

Surface-plasmon mediated photoluminescence from Ag-coated ZnO/MgO core-shell nanowires

Daniel C. Mayo, Claire E. Marvinney, Ephraim S. Bililign, James R. McBride, Richard R. Mu, Richard F. Haglund

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

Abstract

Plasmon-exciton coupling mechanisms were studied in ZnO/MgO core-shell nanowires by comparing nanowires with and without a silver-nanoparticle coating. By varying the thickness of the MgO layer, it was possible to examine the distance-dependent plasmonic effects and elucidate the mechanisms responsible for enhancing the band-edge photoluminescence. The core-shell nanowires exhibited optical cavity effects as a function of MgO thickness that dramatically enhanced the band-edge photoluminescence yields in the ultraviolet. Decorating the core-shell nanowires with Ag nanoparticles resulted in a two-fold plasmonic enhancement of the band-edge emission compared to the resonant cavity effects alone. In this case, an additional differential enhancement of the band-edge emission is observed for the first higher-order mode compared to the lowest-order mode. The visible luminescence is not significantly enhanced and does not follow the trend of enhanced photoluminescence observed for the band-edge decay.

Original language	English
Pages (from-to)	132-137
Number of pages	6
Journal	Thin Solid Films
Volume	553
DOIs	https://doi.org/10.1016/j.tsf.2013.11.131
State	Published - Feb 28 2014
Externally published	Yes

Funding

DCM, CEM and RFH received support from the Office of Science, US Department of Energy ( DE-FG02-01ER45916 ). DCM and RRM gratefully acknowledge the financial support from the United States Department of Defense ( W911NF-11-1-0156 ), and the National Science Foundation NSF-CREST Center for the Physics and Chemistry of Materials ( HRD-0420516 ). ESB was supported by the Research Experience for Undergraduates program of the National Science Foundation at Vanderbilt University ( PHY-1005099 ). High-resolution STEM images in Fig. 2 -c were acquired using the Osiris transmission electron microscope supported by a grant from the National Science Foundation ( EPS 1004083 ). High-resolution SEM images in Fig. 2 -a and b were supplied by Kannatassen Appavoo.

Funders	Funder number
National Science Foundation NSF-CREST Center for the Physics and Chemistry of Materials	HRD-0420516
National Science Foundation	1263045
U.S. Department of Defense	W911NF-11-1-0156
U.S. Department of Energy	DE-FG02-01ER45916
Office of Science
Vanderbilt University	EPS 1004083, PHY-1005099

Keywords

Ag plasmons
Core-shell nanowire
Photoluminescence
Plasmon-exciton coupling
Resonant optical cavity
ZnO excitons

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10.1016/j.tsf.2013.11.131

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title = "Surface-plasmon mediated photoluminescence from Ag-coated ZnO/MgO core-shell nanowires",

abstract = "Plasmon-exciton coupling mechanisms were studied in ZnO/MgO core-shell nanowires by comparing nanowires with and without a silver-nanoparticle coating. By varying the thickness of the MgO layer, it was possible to examine the distance-dependent plasmonic effects and elucidate the mechanisms responsible for enhancing the band-edge photoluminescence. The core-shell nanowires exhibited optical cavity effects as a function of MgO thickness that dramatically enhanced the band-edge photoluminescence yields in the ultraviolet. Decorating the core-shell nanowires with Ag nanoparticles resulted in a two-fold plasmonic enhancement of the band-edge emission compared to the resonant cavity effects alone. In this case, an additional differential enhancement of the band-edge emission is observed for the first higher-order mode compared to the lowest-order mode. The visible luminescence is not significantly enhanced and does not follow the trend of enhanced photoluminescence observed for the band-edge decay.",

keywords = "Ag plasmons, Core-shell nanowire, Photoluminescence, Plasmon-exciton coupling, Resonant optical cavity, ZnO excitons",

author = "Mayo, {Daniel C.} and Marvinney, {Claire E.} and Bililign, {Ephraim S.} and McBride, {James R.} and Mu, {Richard R.} and Haglund, {Richard F.}",

year = "2014",

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doi = "10.1016/j.tsf.2013.11.131",

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AU - Mayo, Daniel C.

AU - Marvinney, Claire E.

AU - Bililign, Ephraim S.

AU - McBride, James R.

AU - Mu, Richard R.

AU - Haglund, Richard F.

PY - 2014/2/28

Y1 - 2014/2/28

N2 - Plasmon-exciton coupling mechanisms were studied in ZnO/MgO core-shell nanowires by comparing nanowires with and without a silver-nanoparticle coating. By varying the thickness of the MgO layer, it was possible to examine the distance-dependent plasmonic effects and elucidate the mechanisms responsible for enhancing the band-edge photoluminescence. The core-shell nanowires exhibited optical cavity effects as a function of MgO thickness that dramatically enhanced the band-edge photoluminescence yields in the ultraviolet. Decorating the core-shell nanowires with Ag nanoparticles resulted in a two-fold plasmonic enhancement of the band-edge emission compared to the resonant cavity effects alone. In this case, an additional differential enhancement of the band-edge emission is observed for the first higher-order mode compared to the lowest-order mode. The visible luminescence is not significantly enhanced and does not follow the trend of enhanced photoluminescence observed for the band-edge decay.

AB - Plasmon-exciton coupling mechanisms were studied in ZnO/MgO core-shell nanowires by comparing nanowires with and without a silver-nanoparticle coating. By varying the thickness of the MgO layer, it was possible to examine the distance-dependent plasmonic effects and elucidate the mechanisms responsible for enhancing the band-edge photoluminescence. The core-shell nanowires exhibited optical cavity effects as a function of MgO thickness that dramatically enhanced the band-edge photoluminescence yields in the ultraviolet. Decorating the core-shell nanowires with Ag nanoparticles resulted in a two-fold plasmonic enhancement of the band-edge emission compared to the resonant cavity effects alone. In this case, an additional differential enhancement of the band-edge emission is observed for the first higher-order mode compared to the lowest-order mode. The visible luminescence is not significantly enhanced and does not follow the trend of enhanced photoluminescence observed for the band-edge decay.

KW - Ag plasmons

KW - Core-shell nanowire

KW - Photoluminescence

KW - Plasmon-exciton coupling

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ER -

Surface-plasmon mediated photoluminescence from Ag-coated ZnO/MgO core-shell nanowires

Abstract

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Keywords

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