Silicon Quantum Dots의 합성 및 특성 규명과 FRET을 통한 Silicon Quantum Dots의 형광 향상에 대한 연구

Abstract

Various reaction conditions, such as quantity of reducing agent and reaction time were investigated with the aim of finding a simple, optimized synthetic route for the synthesis of luminescent Silicon Quantum Dots (SiQDs). SiQDs were synthesized from the reaction of ammonium chloride and magnesium silicide. Optical characterizations of SiQDs were achieved by using ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy. The monotonic shift of the photoluminescence as a function of excitation wavelength resulted from the excitation of different sizes of nanocrystals that had different optical transition energies. Photoluminescent SiQDs containing Camptothecin(CPT) were synthesized by using a Camptothecin(CPT)-derivatized SiQDs. The release of CPT was measured by UV-Vis spectrometer. The intensity of fluorescence of the SiQDs was measured with a drug release. The concentration of released drug exhibited non-linear relationship with a release time. The blue photoluminescence emitting at 450nm with an excitation wavelength of 400 nm is due to the quantum confinement of silicon nanocrystallites in SiQDs. CPT-SiQDs exhibiting an emission band at 570 nm was reacted with SiQDs to give a CPT-derivatized SiQDs. Optical characteristic of CPT-derivatized SiQDs were investigated by UV-Vis and photoluminescence(PL) spectrometer. SiQDs were synthesized from the reaction of Ammonium chloride and magnesium silicide via a low temperature solution route. The blue photoluminescence emitting at 450 nm with an excitation wavelength of 400 nm is due to the quantum efficiency of SiQDs. SiQDs exhibiting an emission band at 450 nm was reacted with Methyltetraphenylvinylsilole to give a silole-derivatized SiQDs. Optical characteristic of silole-derivatized SiQDs were measured by ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy. The size distribution and orientation of a silole-derivatized SiQDs were measured by TEM.