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나노입자 연구단
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Comparative Study of Upconverting Nanoparticles with Various Crystal Structures, Core/Shell Structures, and Surface Characteristics

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Title
Comparative Study of Upconverting Nanoparticles with Various Crystal Structures, Core/Shell Structures, and Surface Characteristics
Author(s)
Young Il Park; Nam, Sang Hwan; Jeong Hyun Kim; Bae, Yun Mi; Byeongjun Yoo; Kim, Hyung Min; Jeon, Ki-Seok; Park, Hyo Sun; Choi, Joon Sig; Lee, Kang Taek; Suh, Yung Doug; Taeg Hwan Hyeon
Publication Date
2013-02
Journal
JOURNAL OF PHYSICAL CHEMISTRY C, v.117, no.5, pp.2239 - 2244
Publisher
AMER CHEMICAL SOC
Abstract
Upconverting nanoparticles (UCNPs) have been studied as novel bioimaging probes owing to the absence of autofluorescence and excellent photostability. For practical applications, biocompatible UCNPs with high upconversion efficiency, bright luminescence, and good colloidal stability are desirable. Herein, we report a quantitative and systematic study on the upconversion luminescence from a set of NaYF4:Yb3+,Er3+- based nanoparticles by varying crystal structures, core/shell structures, and surface ligands. Upconversion luminescent properties in colloidal solution and at the single-particle level were examined. Hexagonal-phase core/shell UCNPs exhibited the most intense luminescence among various structures, while the excellent photostability was observed in all different types of UCNPs. To optimize the biomedical imaging capability of UCNPs, various surface coating strategies were tested. By quantitative spectroscopic measurements of surface-modified UCNPs in water, it was suggested that encapsulation with polyethylene glycol (PEG)-phospholipid was found to be effective in retaining both upconversion luminescence intensity and dispersibility in aqueous environment. Finally, UCNPs with different crystal structures were applied and compared in live cells.
URI
https://pr.ibs.re.kr/handle/8788114/1388
ISSN
1932-7447
Appears in Collections:
Center for Nanoparticle Research(나노입자 연구단) > Journal Papers (저널논문)
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