Characterization of single crystalline CdS nanowires synthesized by solvothermal method.

Cadmium sulfide (CdS) nanowires with uniform diameter were prepared by the solvothermal method using ethylenediamine (en) as solvent. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scan electron microscopy (SEM), energy dispersive spectroscopy (EDS) and transmission electron microscopy (TEM). It was found that the products are hexagonal crystals of CdS nanowires with diameter of 28 nm and length up to several micrometres. Selected area electron diffraction (SAED) and high resolution TEM (HRTEM) studies indicate the single-crystalline nature of CdS nanowires with an oriented growth along the c-axis direction. The absorption spectrum of the as-prepared CdS nanowires shows an absorption peak of around 485 nm. These CdS nanowires exhibit bright photoluminescence (PL) with two distinct emission bands at 502 nm and 696 nm.