Synthesis of ZnS / Sodium Hexameta Phosphate Nanoparticles
R. MOHAN*a, B. RAJAMANNANb and S. SANKARRAJANc
a,c National Engineering College, Kovilpatti – 628 503.
c Annamalai University, Chidambaram – 628 002.
ABSTRACT
Zinc Sulfide (ZnS) nanoparticles with good photoluminescence have
been successfully prepared using chemical precipitation method with
Sodium HexaMeta Phosphate (SHMP) as capping agent. X-ray
diffraction (XRD) analysis has determined the diameter of the
particles as 3.6 nm , which is smaller than Bohr exciton diameter for
ZnS. The study of scanning electron microscope (SEM) images has
shown that the particles have smooth surface passivated with polymer
and the average size of SHMP capped ZnS nanoparticle is less than
100 nm. Ultraviolet / Visible (UV/Vis) absorbance spectra for
synthesized nanoparticles have shown an exitonic peak around 310
nm. Particle sizes with band gap for undoped and doped
nanoparticles have been calculated respectively as 4.23 nm (3.74 eV)
and 2.55 nm (4.01 eV). Photoluminescence (PL) spectra recorded for
undoped and doped ZnS nanoparticles using an excitation wavelength
of 310 nm, exhibit an emission peak centered around 447 nm.
