Investigating the effects of Mn content on the morphology and dielectric properties of CdS nanoparticles

Abstract

CdS nanoparticles doped with Mn were synthesized by chemical precipitation using varying concentrations of Mn at Cd1-xMnxS, where (x) = 0.00, 0.03, 0.05, and 0.07. The samples were examined using scanning electron microscopy (SEM), energy dispersive X-ray techniques (EDX), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, dielectric properties, and AC conductivity measurements. SEM micrograph shows that pure CdS nanomaterial has agglomerates primarily composed of nanoparticles, whereas the sample with a concentration of 0.03 contains smaller particles. In response to the phonon confinement effect, The Raman spectra of CdS nanoparticles exhibited peaks at 303 cm−1 and 603 cm−1. In contrast, the Raman spectra of Mn:CdS nanocomposites displayed a prominent fundamental mode at 301 cm−1 and a less pronounced overtone mode at 601 cm−1. The dielectric properties and the AC conductivity of CdS have been investigated over a wide frequency range of 0.1 Hz to 10 MHz and at a variety of temperatures ranging from 298 to 423K. The real and imaginary parts of the complex dielectric constant (εʹ, εʹʹ), the electric modulus, and AC conductivity of CdS were found to depend on Mn content at different temperatures.