Fabrication and Luminescence Properties of Flower-Like Cadmium Sulfide Using 1-Benzylidenethiourea as Sulfur Source and Capping Agent

Influence of synthesis parameters on the optical and photocatalytic properties of solvo/hydrothermal CuS and ZnS nanoparticles

“…Room temperature UV–vis absorption spectra of the synthesized CuS and ZnS nanostructures are shown in Figure 10. Based on the absorbance (α) data, the optical band gap energy was determined using Tauc's formula [ 27 ] : where hν is the incident photon energy, K is a constant and the optical band exponent n depends on the nature of the involving electronic transitions between valance and conduction bands: n = 0.5 and 2.0 for direct and indirect transitions, respectively. Copper and zinc sulfides are direct semiconductors with a very low absorption coefficient.…”

“…By reducing particle size, quantum size effect generates a blue shift and surface effect causes a red shift in the band gap energy. [ 27 ] The observed shift in the absorption edge of the synthesized nanoparticles to the lower wavelengths was due to a quantum size effect coming from the electron–hole confinement in a small volume. [ 27 ]…”

“…[ 15,16,23 ] In this procedure, the capping agent plays an important role in controlling the stability, shape, and size of the nanoparticles, as well as avoiding their agglomeration. [ 24–26 ] There have recently been several reports on the use of various thio Schiff base ligands as sulfur sources, as well as the capping and reducing agents for synthesis of sulfide nanomaterials, [ 27,28 ] which can be attached directly to metal ions and avoid nanoparticle agglomeration.…”