Synthesis and Characterization of Chromium Doped Zinc Sulfide Nanoparticles

Abstract

Nanoparticles of pure and Zn 1−x Cr x S with concentrations (x = 0.00, 0.02, 0.08 and 0.10) were prepared successfully by co-precipitation technique. Crystallographic study was intervened by X-ray diffraction spectroscopy. There were no extra peaks observed in the XRD pattern. From XRD peaks it is confirmed that the samples prepared were highly pure and cubic in structure. The particle size calculated from XRD data was around 3 nm. It confirms that the quantum dots were formed. Surface morphology and crystal size were verified by scanning electron microscopic (SEM) and transmission electron microscopic (TEM) studies. The aggregation of the nanoparticles was observed, which is due to the quantum dots. Chemical species present in the prepared samples were identified by FTIR study. Using UV-Vis spectrometer (Ultra Violet Visible), absorption spectra were obtained for x = 0.00, 0.02, 0.08 and 0.1. It is confirmed from UV-Vis that the detected absorption peaks were shifted towards higher wavelengths. The energy band gap values were estimated using UV-Vis spectrometer and found lying in the range of 3.33 eV-3.02 eV. The energy band gap decreases with increasing Cr concentrations i.e. the red shift was observed.

Catalytic Hydrogen Evolution from H2S Cracking over CrxZnS Catalyst in a Cylindrical Single-Layered Dielectric Barrier Discharge Plasma Reactor

“…With the Fourier transform infrared (FTIR) analysis, the absorbance of the species in the crystal surface and the nanoparticle formation of ZnS were checked. It is reported that this analysis also gives information about the chemical bonding of the chemical [ 17 ]. The FTIR absorbance spectra of Cr x ZnS with different molar ratios are shown in Figure 3 .…”

Cation exchange doping by transition and non-transition metals: embracing luminescence for band gap tunability in a ZnS lattice

“…21(a) illustrates the cubic structure of the nanoparticles, which is further supported by XRD. 96 Using the chemical co-precipitation method, Ahmed, AL-Osta, et al created Cr-added ZnS nanoparticles, and ultravioletvisible spectra confirmed that with the increment in the doping Fig. 18 PL spectra of lead-doped ZnS nanoparticles.…”

“…21 (a) X-ray diffraction patterns of undoped and Cr-doped ZnS nanoparticles. 96 (b) Optical energy gap vs Cr doping amount, 97 and (c) Cr-doped ZnS PL spectra at various annealing temperatures. 98 increased with increased Fe doping.…”

Modified structural, surface morphological and optical studies of Li3+ swift heavy ion irradiation on zinc oxide nanoparticles

“…In addition, it affects the structural and optical properties and can considerably shi the optical absorption towards the visible region. [17][18][19][20] However, electrical conductivity in the wide band gap of ZnO semiconductors is due to intrinsic defects such as wide band gap and oxygen vacancies. Therefore, substitution of TM metals into ZnO semiconductors changes structural and optical properties drastically.…”