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Title: Multicolor polystyrene nanospheres tagged with up-conversion fluorescent nanocrystals
Authors: Qian, H. 
Li, Z. 
Zhang, Y. 
Issue Date: 25-Jun-2008
Source: Qian, H., Li, Z., Zhang, Y. (2008-06-25). Multicolor polystyrene nanospheres tagged with up-conversion fluorescent nanocrystals. Nanotechnology 19 (25) : -. ScholarBank@NUS Repository.
Abstract: Compared to conventional down-conversion fluorescent materials, NIR-to-visible up-conversion fluorescent materials which emit visible light upon near-infrared (NIR) excitation are better suited for biodetection/bioimaging due to their advantages such as minimum photo-damage to living organisms, weak background fluorescence, low signal-to-noise ratio and high detection sensitivity. Uniform hexagonal NaYF4 (β-NaYF4) nanocrystals with up-conversion fluorescence were synthesized. Monodisperse polystyrene nanospheres with an average size of 400 nm in diameter, tagged with different color β-NaYF4 nanocrystals, were prepared using a miniemulsion polymerization method. More than 20 β-NaYF4 nanocrystals were encapsulated in a single polystyrene nanosphere. The nanospheres emit multicolor NIR-to-visible up-conversion fluorescence upon excitation at a wavelength of 980 nm. The nanospheres could be used for a variety of biological applications which require high-sensitivity detection of biomolecules. © IOP Publishing Ltd.
Source Title: Nanotechnology
ISSN: 09574484
DOI: 10.1088/0957-4484/19/25/255601
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