Synergistic effects of Carbon@MoS2 core-shell nanostructures on charge dynamics for future optoelectronic applications

Abstract

The pursuit of advanced materials for enhancing optoelectronic device performance has led to significant interest in core-shell structures, which combine the unique properties of different materials to achieve superior functionality. This study investigates the hydrothermal synthesis of a series of core-shell Carbon@MoS₂ materials with varying carbon concentrations, aiming to identify the optimal carbon content for enhanced optoelectronic applications. XRD analysis revealed the formation of new crystallographic phases, with crystallite sizes ranging from 1.39 nm to 23.1 nm, indicating significant structural modifications. UV–Vis analysis highlighted an expanded light absorption range and a reduction in bandgap up to 0.92 eV, particularly in carbon-loaded samples. Morphological analysis by FESEM and HRTEM confirmed the successful formation of core-shell nanospheres with well-defined MoS₂ layers enveloping carbon cores. Electrochemical studies, including CV and PEIS, demonstrated that the sample CM4, with an optimal carbon concentration, exhibited balanced redox behavior, lower charge transfer resistance of 2860 Ω, and pronounced Warburg diffusion, marking it as the most effective composition for improving optoelectronic performance in future.