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.
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.
- Content Type Journal Article
- Category Research Paper
- DOI 10.1007/s11051-010-0042-z
- Authors
- Yang Xiang, Wuhan University Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology 430072 Wuhan People’s Republic of China
- Xu-Yang Xu, Wuhan University Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology 430072 Wuhan People’s Republic of China
- Ding-Fei He, Wuhan University Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology 430072 Wuhan People’s Republic of China
- Min Li, Wuhan University Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology 430072 Wuhan People’s Republic of China
- Liang-Bo Liang, Wuhan University Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology 430072 Wuhan People’s Republic of China
- Xue-Feng Yu, Wuhan University Department of Physics, Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education and School of Physics and Technology 430072 Wuhan People’s Republic of China
- Journal Journal of Nanoparticle Research
- Online ISSN 1572-896X
- Print ISSN 1388-0764
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