@Article{CL.2025.222.131,
AUTHOR = {A. M. Abdel-Daiem, M. Ahmed, E. R. Shaaban},
TITLE = {Structural and optical properties of ZnS/rGO nanocomposites optoelectronic devices},
JOURNAL = {Chalcogenide Letters},
VOLUME = {22},
YEAR = {2025},
NUMBER = {2},
PAGES = {131--142},
URL = {http://www.techscience.com/CL/v22n2/64870},
ISSN = {1584-8663},
ABSTRACT = {This paper investigates the impact of reduced graphene oxide (rGO) addition on the 
structural and optical properties of ZnS nanocomposites. The study began with the synthesis 
of graphene oxide (GO) through the oxidation of natural graphite powder. This process 
involved using potassium permanganate in a mixture of sulfuric and phosphoric acids, 
maintained at 50°C for 48 hours. The reaction was terminated using hydrogen peroxide, 
followed by purification and drying, yielding 1.5 grams of GO. The preparation of ZnS/GO 
nanocomposites involved dissolving zinc acetate and varying quantities of GO in water, 
adjusting the pH, and incorporating sodium sulfide. This mixture underwent heating in an 
autoclave at 180°C for 12 hours, followed by washing and freezing, resulting in ZnS-RGO 
composites with differing GO contents. The resulting products were categorized as ZnS0rGO,
 ZnS-5rGO, ZnS-10rGO, ZnS-15rGO, and ZnS-20rGO. To characterize these 
composite samples, the researchers employed several analytical techniques, including 
thermogravimetric analysis (TGA), X-ray diffraction (XRD) analysis, X-ray Photoelectron 
Spectroscopy (XPS), and UV-vis spectroscopy. This comprehensive approach allowed for 
a thorough examination of the effects of rGO incorporation on the nanocomposite's 
properties. The X-ray diffraction (XRD) results showed increased diffraction intensity with 
higher rGO content, attributed to improved crystallinity. The crystallite size and lattice strain 
also increased, with rGO providing nucleation sites. Optical analysis revealed that rGO 
increased absorbance and decreased the optical band gap, likely due to enhanced free charge 
carriers. The extinction coefficient and nonlinear refractive index both increased with rGO 
content, attributed to rGO’s high polarizability and light-matter interactions. },
DOI = {10.15251/CL.2025.222.131}
}