TITLE:
Synthesis and Characterization of Chromium Doped Zinc Sulfide Nanoparticles
AUTHORS:
Milind Bodke, Hari Khawal, Umesh Gawai, Babasaheb Dole
KEYWORDS:
Nanoparticles, Co-Precipitation, Energy Band Gap, Red Shift, Quantum Dots
JOURNAL NAME:
Open Access Library Journal,
Vol.2 No.5,
May
20,
2015
ABSTRACT: Nanoparticles of pure and Zn1-xCrxS 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.