Fabrication of rare-earth/quantum-dot nanocomposites for color-tunable sensing applications

Yang Xiang; Xu Yang Xu; Ding Fei He; Min Li; Liang Bo Liang; Xue Feng Yu

doi:10.1007/s11051-010-0042-z

Fabrication of rare-earth/quantum-dot nanocomposites for color-tunable sensing applications

Yang Xiang, Xu Yang Xu, Ding Fei He, Min Li, Liang Bo Liang, Xue Feng Yu

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

18 Scopus citations

Abstract

We developed a new fluorescent nanocomposite by using a layer-by-layer approach to link NaYF₄:Ce,Tb rare-earth (RE) nanocrystals and CdSe/ZnSe semiconductor quantum dots (QDs) with opposite charges. Under ultraviolet light excitation, the nanocomposites exhibited both the green Tb emission centered at 550 nm, and the red QD emission at 650 nm. Sensing applications showed that the red QD emission was quenched by trace amount of Cu²⁺ (or Ag⁺) ions due to the ion displacement mechanism, while the green RE emission kept constant. Thus, the nanocomposites with the decreased QD/RE emission intensity ratio and changed fluorescence output color provided a visible "indicator" to detect metal ions quantificationally. In comparison with single emission materials, the dual emission nanocomposites can be a more reliable probe for various sensing applications.

Original language	English
Pages (from-to)	525-531
Number of pages	7
Journal	Journal of Nanoparticle Research
Volume	13
Issue number	2
DOIs	https://doi.org/10.1007/s11051-010-0042-z
State	Published - Feb 2011
Externally published	Yes

Funding

Acknowledgments The authors thank the Natural Science Foundation of China (10874134, 10904119), the Specialized Research Fund for the Doctoral Program of Higher Education (20090141120070), and the China postdoctoral science foundation (20090451076) for support.

Funders	Funder number
National Natural Science Foundation of China	10904119, 10874134
China Postdoctoral Science Foundation	20090451076
Specialized Research Fund for the Doctoral Program of Higher Education of China	20090141120070

Keywords

Dual emission
Energy transfer
Quantum dots
Rare-earth nanocrystals
Sensing applications

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abstract = "We developed a new fluorescent nanocomposite by using a layer-by-layer approach to link NaYF4:Ce,Tb rare-earth (RE) nanocrystals and CdSe/ZnSe semiconductor quantum dots (QDs) with opposite charges. Under ultraviolet light excitation, the nanocomposites exhibited both the green Tb emission centered at 550 nm, and the red QD emission at 650 nm. Sensing applications showed that the red QD emission was quenched by trace amount of Cu2+ (or Ag+) ions due to the ion displacement mechanism, while the green RE emission kept constant. Thus, the nanocomposites with the decreased QD/RE emission intensity ratio and changed fluorescence output color provided a visible {"}indicator{"} to detect metal ions quantificationally. In comparison with single emission materials, the dual emission nanocomposites can be a more reliable probe for various sensing applications.",

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AU - Xiang, Yang

AU - Xu, Xu Yang

AU - He, Ding Fei

AU - Li, Min

AU - Liang, Liang Bo

AU - Yu, Xue Feng

PY - 2011/2

Y1 - 2011/2

N2 - We developed a new fluorescent nanocomposite by using a layer-by-layer approach to link NaYF4:Ce,Tb rare-earth (RE) nanocrystals and CdSe/ZnSe semiconductor quantum dots (QDs) with opposite charges. Under ultraviolet light excitation, the nanocomposites exhibited both the green Tb emission centered at 550 nm, and the red QD emission at 650 nm. Sensing applications showed that the red QD emission was quenched by trace amount of Cu2+ (or Ag+) ions due to the ion displacement mechanism, while the green RE emission kept constant. Thus, the nanocomposites with the decreased QD/RE emission intensity ratio and changed fluorescence output color provided a visible "indicator" to detect metal ions quantificationally. In comparison with single emission materials, the dual emission nanocomposites can be a more reliable probe for various sensing applications.

AB - We developed a new fluorescent nanocomposite by using a layer-by-layer approach to link NaYF4:Ce,Tb rare-earth (RE) nanocrystals and CdSe/ZnSe semiconductor quantum dots (QDs) with opposite charges. Under ultraviolet light excitation, the nanocomposites exhibited both the green Tb emission centered at 550 nm, and the red QD emission at 650 nm. Sensing applications showed that the red QD emission was quenched by trace amount of Cu2+ (or Ag+) ions due to the ion displacement mechanism, while the green RE emission kept constant. Thus, the nanocomposites with the decreased QD/RE emission intensity ratio and changed fluorescence output color provided a visible "indicator" to detect metal ions quantificationally. In comparison with single emission materials, the dual emission nanocomposites can be a more reliable probe for various sensing applications.

KW - Dual emission

KW - Energy transfer

KW - Quantum dots

KW - Rare-earth nanocrystals

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Fabrication of rare-earth/quantum-dot nanocomposites for color-tunable sensing applications

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Keywords

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