Effect of Li+ concentration on the structural and optical properties of chemically synthesized ZnS nanoparticles
Year: 2023
Type: article
Abstract: Zinc sulfide is one of the most studied semiconductor materials due to its wide band gap and its multiple applications fields. In this work the structural, morphological and optical properties of ZnS nanoparticles (NPs) with different concentration of Li-doping (0, 2.5, 4.5, 6.5 and 10.5 %) were studied. The co-precipitation method was used to synthesize the samples without a capping agent. The cubic structures was observed in the X-ray diffraction (XRD) analyses of un-doped and Li-doped ZnS NPs with a preferential orientation for the (111) plane. The spherical shapes of the NPs of the samples studied were observed in scanning electron microscopy (SEM) and in high resolution transmission electron microscopy (HRTEM) images. Fourier transform infrared spectrophotometer (FTIR), analyses confirmed the strong interaction between ZnS NPs and Li doping. Photoluminescence (PL) and UV- visible spectroscopy were used to study the optical properties of the samples. The peaks observed from the photoluminescence (PL) analyses after Gaussion fitting were laying in the visible region. Ultraviolet–visible absorption spectra (A) show absorption peaks decreased with increasing Li concentration. The direct band gap energy (Egp) was estimated in the range of (3.728 - 3.875 eV) and found increasing with the increasing of Li concentration. The quantum confinement effect was observed for un-doped and Li-doped ZnS NPs.
Source: Results in Optics
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,000
OpenAlex ID: W4362639773