Surface plasmon-enhanced light-emission mechanism of Ag-coated ZnO/Al 2O3 core/shell nanorod structures

Bum Young Noh; Seong Ho Baek; Yong II Jung; Jae Hyun Kim; II Kyu Park

doi:10.1166/jnn.2013.7299

Surface plasmon-enhanced light-emission mechanism of Ag-coated ZnO/Al ₂O₃ core/shell nanorod structures

Bum Young Noh, Seong Ho Baek, Yong II Jung, Jae Hyun Kim, II Kyu Park

Division of Energy Techonology

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

7 Scopus citations

Abstract

Surface plasmon (SP)-enhanced light emission mechanism has been investigated for the Ag-coated ZnO/Al₂O₃ core/shell nanorods (NRs). Structural characterizations showed that the ZnO NRs were covered by conformal Al₂O₃ layer and coated by Ag nanoparticles (NPs). The optical studies by photoluminescence (PL) showed abnormal variation of PL intensity with increasing the thickness of Al ₂O₃. For the Ag NPs-coated ZnO NRs without Al ₂O₃ shell layer, the PL emission quenched due to direct transfer of the photo-excited electrical carriers from ZnO NRs to Ag NPs. With thin Al₂O₃ layers less than 15 nm, the PL intensity increased with increasing the thickness of Al₂O₃ layers due to weakening of the Förster-type energy transfer while strong SP-mediated PL emission enhancement. For thicker Al₂O₃ layers than 15 nm, however, the PL intensity decreased with increasing the thickness of Al₂O₃ layers due to weakening of SP-mediated PL emission enhancement.

Original language	English
Pages (from-to)	3335-3340
Number of pages	6
Journal	Journal of Nanoscience and Nanotechnology
Volume	13
Issue number	5
DOIs	https://doi.org/10.1166/jnn.2013.7299
State	Published - May 2013

Keywords

Ag nanoparticle
Förster energy transfer
Surface plasmon
ZnO nanorods

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title = "Surface plasmon-enhanced light-emission mechanism of Ag-coated ZnO/Al 2O3 core/shell nanorod structures",

abstract = "Surface plasmon (SP)-enhanced light emission mechanism has been investigated for the Ag-coated ZnO/Al2O3 core/shell nanorods (NRs). Structural characterizations showed that the ZnO NRs were covered by conformal Al2O3 layer and coated by Ag nanoparticles (NPs). The optical studies by photoluminescence (PL) showed abnormal variation of PL intensity with increasing the thickness of Al 2O3. For the Ag NPs-coated ZnO NRs without Al 2O3 shell layer, the PL emission quenched due to direct transfer of the photo-excited electrical carriers from ZnO NRs to Ag NPs. With thin Al2O3 layers less than 15 nm, the PL intensity increased with increasing the thickness of Al2O3 layers due to weakening of the F{\"o}rster-type energy transfer while strong SP-mediated PL emission enhancement. For thicker Al2O3 layers than 15 nm, however, the PL intensity decreased with increasing the thickness of Al2O3 layers due to weakening of SP-mediated PL emission enhancement.",

keywords = "Ag nanoparticle, F{\"o}rster energy transfer, Surface plasmon, ZnO nanorods",

author = "Noh, {Bum Young} and Baek, {Seong Ho} and Jung, {Yong II} and Kim, {Jae Hyun} and Park, {II Kyu}",

year = "2013",

month = may,

doi = "10.1166/jnn.2013.7299",

language = "English",

volume = "13",

pages = "3335--3340",

journal = "Journal of Nanoscience and Nanotechnology",

issn = "1533-4880",

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T1 - Surface plasmon-enhanced light-emission mechanism of Ag-coated ZnO/Al 2O3 core/shell nanorod structures

AU - Noh, Bum Young

AU - Baek, Seong Ho

AU - Jung, Yong II

AU - Kim, Jae Hyun

AU - Park, II Kyu

PY - 2013/5

Y1 - 2013/5

N2 - Surface plasmon (SP)-enhanced light emission mechanism has been investigated for the Ag-coated ZnO/Al2O3 core/shell nanorods (NRs). Structural characterizations showed that the ZnO NRs were covered by conformal Al2O3 layer and coated by Ag nanoparticles (NPs). The optical studies by photoluminescence (PL) showed abnormal variation of PL intensity with increasing the thickness of Al 2O3. For the Ag NPs-coated ZnO NRs without Al 2O3 shell layer, the PL emission quenched due to direct transfer of the photo-excited electrical carriers from ZnO NRs to Ag NPs. With thin Al2O3 layers less than 15 nm, the PL intensity increased with increasing the thickness of Al2O3 layers due to weakening of the Förster-type energy transfer while strong SP-mediated PL emission enhancement. For thicker Al2O3 layers than 15 nm, however, the PL intensity decreased with increasing the thickness of Al2O3 layers due to weakening of SP-mediated PL emission enhancement.

AB - Surface plasmon (SP)-enhanced light emission mechanism has been investigated for the Ag-coated ZnO/Al2O3 core/shell nanorods (NRs). Structural characterizations showed that the ZnO NRs were covered by conformal Al2O3 layer and coated by Ag nanoparticles (NPs). The optical studies by photoluminescence (PL) showed abnormal variation of PL intensity with increasing the thickness of Al 2O3. For the Ag NPs-coated ZnO NRs without Al 2O3 shell layer, the PL emission quenched due to direct transfer of the photo-excited electrical carriers from ZnO NRs to Ag NPs. With thin Al2O3 layers less than 15 nm, the PL intensity increased with increasing the thickness of Al2O3 layers due to weakening of the Förster-type energy transfer while strong SP-mediated PL emission enhancement. For thicker Al2O3 layers than 15 nm, however, the PL intensity decreased with increasing the thickness of Al2O3 layers due to weakening of SP-mediated PL emission enhancement.

KW - Ag nanoparticle

KW - Förster energy transfer

KW - Surface plasmon

KW - ZnO nanorods

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DO - 10.1166/jnn.2013.7299

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VL - 13

SP - 3335

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JO - Journal of Nanoscience and Nanotechnology

JF - Journal of Nanoscience and Nanotechnology

IS - 5

ER -

Surface plasmon-enhanced light-emission mechanism of Ag-coated ZnO/Al ₂O₃ core/shell nanorod structures

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