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KMID : 0385520150280010033
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Analytical Science & Technology
2015 Volume.28 No. 1 p.33 ~ p.39
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Characterization of CdS-quantum dot particles using sedimentation field-flow fractionation (SdFFF)
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Choi Jae-yeong
Kim Do-Gyun
Lee Seung-Ho
Jung Euo-Chang
Kwen Hai-Doo
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Abstract
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CdS-QD particles are a nano-sized semiconducting crystal that emits light. Their optical properties show 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 the quality control of CdS-QD particle requires accurate determination of the size distribution. In this study, CdS-QD particles were synthesized by a simple r-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, sedimentation field-flow fractionation (SdFFF) was employed. Effects of carious parameters including the the flow rate, external field strength, and field programming conditions were investigated to optimize SdFFF for analysis of CdS-QD particles. 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 having the 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 distribution of various types of inorganic particles.
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KEYWORD
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Sedimentation field-flow fractionation (SdFFF), Quantum dot (QD), Size and size distribution, r-ray irradiation method,
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