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Fabrication and Optical Characteristics of CdS Quantum Dot Structures in Aqueous Solution Using a Gamma-ray Irradiation Technique
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 Title & Authors
Fabrication and Optical Characteristics of CdS Quantum Dot Structures in Aqueous Solution Using a Gamma-ray Irradiation Technique
Jeang, Eun-Hee; Lee, Jae-Hoon; Yim, Sang-Youp; Lee, Chang-Youl; Choi, Young-Soo; Choi, Joong-Gill; Park, Seung-Han;
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 Abstract
CdS semiconductor quantum dot (QD) structures in aqueous solution are fabricated by using a gamma-ray irradiation technique and their optical absorption spectra are investigated. Cadmium sulfate solution, 2-mercaptoethanol solution, and reducing agent are employed to produce CdS molecules, leading to CdS quantum dots. The measured linear absorption spectra before and after g-ray irradiation clearly show exciton peaks between 300 nm and 400 nm, which indicate the formation of CdS QD`s. It is also observed that the exciton peaks are red-shifted with increasing the g-ray irradiation time from 5 min to 15 min. Therefore, it is concluded that the mean QD sizes can be systematically controlled with the dosage of the g-ray irradiation.
 Keywords
CdS Quantum Dot;Gamma-ray Irradiation;Aqueous Solution;Exciton Peaks;
 Language
Korean
 Cited by
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