Tweaking of the morphological pattern in copper sulphide nanoparticles: How does it affect the optical properties?

Abstract

A simple wet chemical method is employed to synthesize covellite (CuS) nanostructures and different nanostructures are synthesized by varying molar ratios of copper acetate monohydrate to sodium thiosulfate pentahydrate in the starting solution. Microstructural characterizations confirm the excellent quality of synthesized CuS nanostructures having different morphology. The absorption spectra and morphology of synthesized samples change significantly with changing experimental conditions. The intensity ratio of NIR peak to UV peak, NIR peak position, and FWHM of NIR peak vary notably with the molar ratio of copper acetate monohydrate to sodium thiosulfate pentahydrate in the initial solution. The facile technique adopted in this work opens up an easy way to prepare CuS nanostructures with outstanding intensity and FWHM of NIR peak due to their unique optical properties.