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  • 03월 02일 17시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제109회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Silicon Quantum Dots with Conjugated Organic Shell

2012년 3월 2일 16시 06분 34초
PHYS.P-526 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 25일 (수요일) 18:00~21:00
저자 및
Mai Xuan Dung, 정소희1, 정현담2
전남대학교 화학과, Vietnam
1한국기계연구원 나노기계연구본부, Korea
2전남대학교 화학과, Korea
Various silicon quantum dots (Si QD) terminated with different capping molecules including heptene (Hept), trimethylsilylacetylene (TMSAc), Phenylacetylene (PheAc), and Dimethylphenylsilylacetylene (MPSAc) were synthesized by post hydosilylation the as-prepared hydrogen terminated Si QDs with the corresponding capping molecules. All of the Si QDs have diamond crystal structure, similar size distribution, and average size of about 1.75 nm. The quantum yields are in the range from 4 to 12% by comparison with 2-aminopyridine, which has standard quantum yield of 60%. The decay of photoluminescence (PL) can be fitted with two component exponential function It=A1exp(-t/τ1)+A2exp(-t/τ2) where τ1, τ2 are in the range from 1 to 6 ns. The rate of radiative and non-radiative decay pathways are about 107-108 s-1, which are comparable with the transition rate in CdSe QDs. Interestingly, the optical gap of Si QD is decreasing in the order Hept-Si QD, TMSAc-Si QD, PheAc-Si QD, MPSAc-Si QD, from 3.45 eV to 3.32, 3.16 then 3.10 eV. From simple “particle in a box” model, the decrease in the optical gap of Si QD can be attributed to the relaxation of exciton from the Si QD core into the capping layer shell induced by the reduction in potential height of the barrier.