The morphology and optical properties of CdS nanoribbons were studied by transmission electron microscopy and photoluminescence spectroscopy. The wurtzite-structured nanoribbons have a uniform rectangular cross section and grow along the [120] crystallographic direction. They are enclosed by small indice surfaces and have a highly perfect crystalline interior, free of extended defects. Luminescence peaks assigned to free and bound excitons were observed from these nanoribbons at low temperatures. In addition, a surface related luminescence band was also identified, showing that the proximity of unpassivated surfaces does not lead to dissociation of excitons in CdS nanoribbons of high purity and structural quality, even when their thickness is around 20 nm.
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Ip et al. (2004) studied this question.
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