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https://scholarbank.nus.edu.sg/handle/10635/19024
DC Field | Value | |
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dc.title | Synthesis And Characterization Of CaF2:Yb,Er(CORE) /CaF2(SHELL) Up-Conversion Nanoparticles | |
dc.contributor.author | LIU ZHENGYI | |
dc.date.accessioned | 2011-01-31T18:00:18Z | |
dc.date.available | 2011-01-31T18:00:18Z | |
dc.date.issued | 2010-08-03 | |
dc.identifier.citation | LIU ZHENGYI (2010-08-03). Synthesis And Characterization Of CaF2:Yb,Er(CORE) /CaF2(SHELL) Up-Conversion Nanoparticles. ScholarBank@NUS Repository. | |
dc.identifier.uri | http://scholarbank.nus.edu.sg/handle/10635/19024 | |
dc.description.abstract | The synthesis of monodispersed CaF2:Yb,Er up-conversion nanoparticles (particle size ~ 5.4 nm ? 0.9 nm) using thermolysis of precursors in oleylamine at 340 oC was studied. These nanoparticles were characterized using TEM, XRD, FTIR, Zeta potential, DTA/TGA and XPS. An undoped CaF2 shell was subsequently deposited on the doped core nanoparticles to form the CaF2:Yb,Er(core)/CaF2(shell) structure in order to improve the emission intensity. The critical shell thickness was determined to be ~ 2.5 nm which improved the emission intensity by more than 20 times. Both core and core/shell nanoparticles were stable in solvents such as chloroform and hexane. Amorphous silica coating on CaF2:Yb,Er(core)/CaF2(shell) UCNPs was also achieved to demonstrate the potential for bio-application. CaF2:Yb,Er(core)/CaF2(shell) up-conversion nanoparticles showing strong red emission, with its longer wavelength and penetration distance compared with that of shorter wavelengths of green and blue lights, may find promising potential applications. | |
dc.language.iso | en | |
dc.subject | CaF2, rare-earth doping, up-conversion, core-shell structure, near infrared, thermal decomposition, silica coating | |
dc.type | Thesis | |
dc.contributor.department | MATERIALS SCIENCE AND ENGINEERING | |
dc.contributor.supervisor | CHOW GAN-MOOG | |
dc.description.degree | Master's | |
dc.description.degreeconferred | MASTER OF ENGINEERING | |
dc.identifier.isiut | NOT_IN_WOS | |
Appears in Collections: | Master's Theses (Open) |
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M.Eng LiuZY.pdf | 1.65 MB | Adobe PDF | OPEN | None | View/Download |
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