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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-mercap- toethanol solution, and reducing agent e aq − are employed to produce CdS molecules, leading to CdS quantum dots. The measured linear absorption spectra before and after γ-ray irradiation clearly show exciton peaks between 300 nm and 400 nm, which indicate the formation of CdS QD's. It is also obs erved that the exciton peaks are red-shifted with increasing the γ-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 γ-ray irradiation.

Fabrication and Optical Characteristics of CdS Quantum Dot Structures in Aqueous Solution Using a Gamma-ray Irradiation Technique