Synthesis and properties of (Fe, Ni)-doped zinc sulfide nanopowders
- PDF / 2,436,465 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 75 Downloads / 208 Views
Synthesis and properties of (Fe, Ni)‑doped zinc sulfide nanopowders B. Sreenivasulu1 · S. Venkatramana Reddy2 · P. Swapna2 Received: 1 February 2020 / Accepted: 12 June 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Pure and (Fe, Ni)-doped ZnS nanopowders have been successfully synthesized by chemical co-precipitation method using Poly Vinyl Pyrrolidone (PVP) as capping agent. Powder X-ray diffraction (XRD) studies reveal that the synthesized powders are in cubic blended structure. The average crystalline size of pure and doped ZnS nanopowder conform around 2–3 nm. In the investigations, Ni is kept constant at 3 mol% and Fe is increased from 1 to 5 mol%. Transition electron microscopy (TEM) is also used to investigate the average size of the nanopowders. TEM results are reasonably in good agreement. SEM micrographs of the (Fe, Ni)-doped nanopowders result in agglomeration with spherical in shape. The EDAX spectra show the chemical composition of dopants is uniform in ZnS. Optical absorption spectra show the absorption edge at 310 nm. Photoluminescence (PL) studies are conducted with excitation wavelength of 306 nm. Pure ZnS exhibits sharp emission peaks at 438 nm, 450 nm and 466 nm. (Fe, Ni)-doped ZnS samples also exhibit the sharp emission peaks at 450 nm and 467 nm with decreasing intensity. The magnetic measurements reveal that 5 mol% Fe- and 3 mol% Ni-doped ZnS nanopowders exhibit a weak ferromagnetic behavior.
1 Introduction Semiconducting materials doped with magnetic materials are known as dilute magnetic semiconductors (DMS) [1]. The authors have a lot of interest in transition and rare-earth dopants and hence in DMS due to their charge and spin controlling features, DMS materials have created a lot of interest in various scientific fields. The semiconducting materials like II–VI and III–V group compounds are popular host materials for transition metals (TM) and rare-earth metals (RE). These materials have found applications in spintronics and other bandgap engineering devices, light emitting diodes, field detectors, lasers, magnetic resonance imaging (MRI) and solar cells [2–7]. II–VI compounds such as CdS, CdSe, ZnS, ZnO and ZnSe are most popular host materials which are doped with transition metals (TM) or rareearth metals (RE) [8–13]. ZnS is a wide bandgap material (3.72 eV) and a favorable host for transition metals due a * S. Venkatramana Reddy [email protected] 1
Department of Physics, Annamacharya Institute of Technology & Sciences (Autonomous), Rajampet, A.P 516126, India
Department of Physics, Sri Venkateswara University, Tirupati, A.P 517502, India
2
variety of applications. Many have investigated the optical and magnetic properties of ZnS-based DMS nanostructures [14–29]. Some important studies are electrical and magnetic properties of cold compacted Fe-doped ZnS nanoparticles [30, 31]. A gradual increase of magnetization in (Fe, Ni)doped samples has been observed at room temperature. Sambavisham et al. [32] have reported induced magnetism i
Data Loading...
