Preparation of stochiometric CuInS2 nanostructures by ultrasonic method

In this Letter, an ultrasonic method for the synthesis of CuInS₂ nanostructure with the use of no surfactants is described. This method is facile and provides an appropriate condition for the preparation of structures with various morphologies. In this study, the effect of different parameters such as type of sulphur sources, concentration of precursors, time and power of ultrasonic irradiation on the morphology and the particle size were studied. The results indicated that the type of sulphur source plays an important role in the morphology of CuInS₂. The synthesised materials were characterised by means of X-ray diffraction, energy-dispersive X-ray analysis, scanning electron microscopy, transmission electron microscopy, infrared spectrum and photoluminescence spectroscopy. CuInS₂ nanoparticles were obtained after calcinations of the products at 350°C. The obtained results are discussed in detail.