International Journal of Innovative Research and Development

Hirendra Das , Trishna moni Das , Susmita Rabha , Suparna Bhattacharjee , Pranayee Datta

Abstract

Zinc Sulphide (ZnS) is a group II-VI semiconductor having a large band gap of 3.54 eV for cubic and 3.91 eV for hexagonal structures which can be further increased by reducing the size. The physical and electrical properties of these nanocomposites changes significantly when doped with other suitable materials. In this paper we report synthesis, characterization and Low-Pass filter characteristics of ZnS:Cu nanoparticles embedded in PVA matrix.
Chemical route is used to prepare ZnS:Cu nanocrystals embedded in Polyvinyl Alcohol (PVA). The UV-Vis spectroscopy of the prepared sample shows an absorption peak at 301 nm. PL spectra show an emission peak at 400 nm. The gain vs frequency curve of the samples is identical to the characteristics curve of a Low Pass filter. The frequency response of the prepared samples shows their possible applications as Law Pass Filter.

Keywords

ZnS: Cu Nanoparticles, Low Pass Filter, Frequency Response

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Lipi Goswami , Hirendra Das , Prabin Kumar Boruah , Pranayee Datta

Abstract

Pbs nanoparticles are synthesized in the polymer matrix, starch, by means of chemical method. The samples are prepared by varying pH, temperature and rotation time of the stirrer. The crystalline structure of the nanoparticles is studied by X-ray measurements. The average size of the nanoparticles and their crystalline structure are determined from the transmission electron microscopy and electron diffraction patterns, respectively. The optical properties of the samples are studied by UV-Vis spectroscopy. The absorbtion spectra of the samples display exciton absorbtion bands at much higher energy than the fundamental absorbtion bands of the bulk PbS. This result is a consequence of strong quantum confinement effects produced by the reduced size of the PbS nanoparticles as compared to exciton Bohr diameter of the bulk PbS.

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