침강 장-흐름 분획법을 이용한 CdS 양자점 입자의 특성 분석

CdS-QD particles are a nano-sized semiconducting crystal that emits light. Their optical propertiesshow great potential in many areas of applications such as disease-diagnostic reagents, optical technologies,media industries and solar cells. The wavelength of emitting light depends on the particle size and thus thequality control of CdS-QD particle requires accurate determination of the size distribution. In this study, CdSQDparticles were synthesized by a simple γ-ray irradiation method. As a particle stabilizer polyvinyl pyrrolidone(PVP) were added. In order to determine the size and size distribution of the CdS-QD particles, sedimentationfield-flow fractionation (SdFFF) was employed. Effects of carious parameters including the the flow rate, externalfield strength, and field programming conditions were investigated to optimize SdFFF for analysis of CdSQDparticles. The Transmission electron microscopy (TEM) analysis show the primary single particle size was~4 nm, TEM images indicate that the primarty particles were aggregated to form secondary particles havingthe mean size of about 159 nm. As the concentration of the stabilizer increases, the particle size tends to decrease. Mean size determined by SdFFF, TEM, and dynamic light scattering (DLS) were 126, 159, and 152 nm,respectively. Results showed SdFFF may become a useful tool for determination of the size and its distributionof various types of inorganic particles.