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소개 및 활동/사업
대한화학회 창립 75주년
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09월 06일 15시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Up-conversion luminescence enhancement of NaGdF4 :Yb3+, Er3+, Tm3+ nanoparticle by solvothermal method
2013년 8월 29일 17시 01분 35초
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10월 16일 (수요일) 16:00~19:00
창원대학교 화학과, Korea
Nanoparticle materials have been the subject of increased scientific interest, both for fundamental research and for a wide area of application. This interest has arisen for various reasons. The large surface-to-volume ration in nanoparticles can have a significant impact and influence on their physical properties compared to their bulk counterparts. The tendency for ever-smaller electronic devices opens the possibility for the use of nanoparticles. In addition, small particles are increasingly used in various medical applications, such as drug targeting, magnetic fluid hyperthermia, magnetic resonance imaging and other. Recently, in this area has greatly intensified due to the recent development of lanthanide-doped oxide nanoparticles that exhibit NIR-to-visible up-conversion emission. Nanoparticle up-conversion phosphors can be incorporated into a broad range of materials and devices and are suitable for sensing at the molecular scale. Although, the optical properties of Ln3+ ions are widely studied in several fluoride matrices in the bulk, studies on their corresponding dispersible nanoparticles are mostly restricted to NaGdF4. Er3+, Tm3+ and Yb3+ doped NaGdF4 phosphors were prepared by solvothermal reaction method. The preparation ReCl3 solution (Re = Gd, Er, Tm and Yb). This rare earth solution (1 mol/L) added 8ml oleic acid (OA) and 18 ml 1-octadecene (ODE). The solution was heated to 160 oC for 30 min and then cooled down to room temperature. Thereafter, 10 ml methanol solution of NH4F (4 mmol) and NaOH (10 mmol) was added dropwise under stirring for 30 min. After methanol evaporated the solution was heated to 300 oC under nitrogen atmosphere and the temperature should be maintained for 0.5 hr to 1.0 hr, during this procedure the condenser pipe was needed and the stirring speed was about 1,000 rpm. The resulting nanoparticles were precipitated by the addition of ethanol, collected by centrifugation washed with ethanol several times. Their crystalline structures, surface morphologies and phase transitions were investigated according to annealing process by using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence (PL).
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