One-step synthesis of high pure CdS nanofilms via hydrothermal method

Abstract

CdS nanofilms were directly synthesized on Al2O3 substrates by one-step hydrothermal method assisted with biomolecule l-cysteine. Amongst, CdCl2·2.5H2O and thiourea served as the source of cadmium and sulfur, respectively. The final products were obtained with hexagonal morphology. In addition, the products were characterized by X-ray diffraction pattern, scanning electron microscopy and high resolution transmission electron microscopy. The results showed that the CdS nanofilms had an excellent crystallinity. To evaluate the optical properties of CdS nanofilms, the photoluminescence spectrometer was exploited. Moreover, a possible formation mechanism of the morphology was discussed. Accordingly, hydrothermal method should be a simple and attractive strategy to improve the optical properties of CdS nanofilms and synthesis CdS nanofilms with controlled morphologies.