Effect of Sulfur Precursor on Dimensions of One-dimensional CdS Nanocrystals

Abstract

Abstract:

One-dimensional CdS nanocrystals have been prepared by solvothermal method using cadmium acetate as a cadmium precursor, elemental sulfur and Na₂S, as a sulfur precursor, and ethylenediamine as a solvent at 150°C for 5 h. The nanocrystals were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV-Vis absorption spectroscopy. XRD patterns indicate that both Na₂S and elemental sulfur as the sulfur precursor result in CdS nanorods with wurtzite phase (hexagonal structure). SEM and TEM images show that diameter of CdS nanorods can be decreased using Na₂S instead of elemental sulfur. For the growth of CdS nanorods, a mechanism has been proposed. Uv-Vis absorption of CdS nanorods (sulfur precursor: Na₂S) was shown blue shift to 485 nm due to the quantum size effect.

Key words: Nanomaterials, Semiconductors, CdS nanorods, Na₂S, Solvothermal method

M. Maleki,Sh. Mirdamadi,R. Ghasemzadeh,M. Sasani Ghamsari. Effect of Sulfur Precursor on Dimensions of One-dimensional CdS Nanocrystals[J]. J Mater Sci Technol, 2009, 25(04): 462-464.

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