Synthesis and Characterization of Mercuric Sulfide Nanoparticles Thin Films by Pulsed Laser Ablation (PLA) in Distilled Water (DW)

Thin films of meta-cinnabar mercuric sulfide (β-hgs) nanoparticles (nps) was prepared by pulsed laser ablation (pla) utilizing a pellet of cinnabar mercuric sulfide (α-hgs) was immersed in distilled water (dw). q-switched nd:yag laser of 1064 nm wavelengths with repetition rate (1 hz) and fluency (1.5 j/ cm^2) applied for ablation. structural, morphological, and particle sizes of the β-hgs nps are investigated by analyzing xrd, afm, sem, and tem measurements. their crystal structure is transformed from hexagonal (wurtzite) of the α-hgs target material to cubic (zinc blende) β-hgs nps. the optical properties of the β-hgs nps are measured by uv–visible spectrophotometer. the direct bandgap is calculated to be (2.45 ev) of small particles (4-6.2 nm) moreover, the bandgap value of smallest particles (1-4 nm) is (3.47 ev) according to the optical transmission spectra.