Abstract
In this paper, CdS nanocrystallites are prepared by encapsulation in poly (ethylene oxide) polymer (PEO). It is found that PEO could provide a confined environment for particle neucleation and crystallite growth of CdS nanocrystallites. The absorption onset of the CdS nanocrystallites shifts to shorter wavelength with decreasing the amounts of Cd 2+ in PEO, indicating the particle size could be controlled under the change of the Cd 2+/PEO relative concentration. Their corresponding photoluminescence peaks are all located at about 630 nm, which origins from the sulfur vacancies, but the intensities increase with increasing the molar ratio of Cd 2+/PEO. When CdS nanocrystallites are modified by excessive S 2−, the emissions from band gap are observed and the peak positions show coherent shift with the absorption onsets. Such a blue-shift of the emissions could be explained by size quantization effects.
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