Authors: R. Sarkar, P. Kumbhakar, A.K. Mitra
Affilation: NIT Durgapur, India, India
Pages: 343 - 346
Keywords: ZnS nanoparticles, chemical synthesis, optical properties
Nanoparticles of ZnS:Ag doped with Ag+ (0.5%) and capped with polyvinyl pyrolidone (PVP) have been synthesized by chemical co-precipitation method. The measured particle size is ~2.5 nm which has been obtained from the analyses of X-ray diffraction (XRD) pattern and high resolution transmission electron microscope (HRTEM) image of the sample. The optical absorption and photoluminescence (PL) emission properties are obtained by using UV-visible spectrophotometer and PL spectrometer, respectively. The quantum confinement effect is demonstrated by the blue shift in the bandgap of the sample. The Gaussian fittings of the measured room-temperature PL spectrum shows the presence of six emission bands centered at 356.5, 393, 449, 483, 508, and 526 nm. However, the intensity of the emission band at 393 nm in ZnS:Ag sample is the strongest and it is ~60 times more intense than that of the PL emission intensity obtained in an undoped ZnS sample.