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  • 09월 01일 18시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제118회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Metal enhanced fluorescence of dyes near silver nanosurface

2016년 9월 1일 17시 47분 23초
PHYS.P-450 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
10월 13일 (목요일) 11:00~12:30
저자 및
이재범, 이대두1, 송정현1, 방윤수*
GIST 물리화학부, Korea
1GIST 화학과, Korea
When dye molecules exist close to plasmonic nanoparticles, fluorescence intensities of dye molecules are strongly enhanced by the increase of local electric field or energy transfer between fluorophore and metal nanoparticles and subsequent emission. Excited state dynamics of 4-(dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) with silver island film (SIF) in methanol showed strong dependence on the excitation wavelength in femtosecond transient absorption measurements. In this work, changes in the excited state kinetics and energy transfers between DCM and SIF in several solvents were studied by femtosecond transient absorption spectroscopy. Although the absorption spectra of DCM are similar in polar and nonpolar solvents, the emission spectra of DCM show large Stokes shift in polar solvents (538 nm in benzene, 562 nm in chloroform, 630 nm in methanol) due to the formation of the intra-molecular charge transfer state. In addition, silver colloidal surfaces with high homogeneity in particles’ size and shape were prepared by a kinetically controlled seed-growth method. Excited states dynamics of DCM with the silver colloidal surfaces in composed of nanoparticles in 20-200 nm diameters in several polar and nonpolar solvents will be studied by transient absorption experiments. From these experimental results, detailed mechanisms of MEF and energy transfer between dyes and silver nanosurface will be sought.