In this research, bismuth sulfide (Bi₂S₃) nanoparticles were synthesized using the solvothermal method, and their structural, chemical, and optical properties were investigated. Characterization of the nanoparticles was performed using FT-IR, XRD, SEM, EDX, UV-Vis, and PL techniques. FT-IR results confirmed the presence of functional groups related to the bismuth sulfide structure, with characteristic Bi-S stretching vibrations observed at 450–600 cm⁻¹. The X-ray diffraction (XRD) pattern revealed the orthorhombic crystal structure of the nanoparticles, and the crystallite size was calculated to be approximately 38 nm using the Debye-Scherrer equation. SEM images showed a uniform morphology and nanoscale structure of the particles with needle-like structures in the range of 40–90 nm, while the EDX spectrum confirmed the presence of pure bismuth and sulfur elements with weight percentages of 78.8% and 21.2%, respectively. The UV-Vis spectrum calculated the energy gap of the nanoparticles to be 2.45 eV. Additionally, the PL spectrum identified electronic transitions and optical properties of the nanoparticles with a main emission peak at around 500 nm. Due to their unique optical and electronic properties, these nanoparticles have high potential for use in solar cells, sensors, and optoelectronic devices.
Amiri et al. (Sat,) studied this question.