Effect of annealing temperature on optical and magnetic properties of Cr doped ZnS nanoparticles |
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| Authors: | D Amaranatha Reddy G Murali B Poornaprakash RP Vijayalakshmi BK Reddy |
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| Institution: | 1. Department of Electronic Engineering, Yeungnam University, Gyeongsan 38541, South Korea;2. Department of Physics, Siddartha Educational Academy Group of Institutions, Tirupati 517502, India;1. Department of Physics, P.V.K.N. Govt. Degree College, Chittoor, A.P., India;2. Department of Physics, Sri Venkateswara University, Tirupati, India;3. Department of Chemistry and Chemical Institute for Functional materials, Pusan National University, Busan 609-735, South korea;4. Department of Physics, Pukyong National University, Busan 608-737, South Korea;1. Nano Research Lab, School of Physics & Materials Science, Thapar University, Patiala 147 004, India;2. Lawrence Berkeley National Laboratory, Berkeley CA 94720-1460, USA;1. Nanoscience Laboratory, Dept. of Physics, National Institute of Technology, Durgapur 713209, West Bengal, India;2. Department of Materials Engineering, Indian Institute of Science, Bangalore, India;1. Faculty of Graphic Arts and Media, HCMC University of Technology and Education, No. 1 Vo Van Ngan Street, Linh Chieu Ward, Thu Duc District, Ho Chi Minh City 700000, Vietnam;2. University of Science, Viet Nam National University Ho Chi Minh City, No. 227 Nguyen Van Cu Street, Ward 4, District 5, Ho Chi Minh City 700000, Vietnam;3. Institute of Physics, Viet Nam Academy of Science and Technology, No. 10, Dao Tan, Thu Le, Ba Dinh, Ha Noi 100000, Vietnam;4. Duy Tan University, No. 254 Nguyen Van Linh Street, Thanh Khe District, Da Nang City, Vietnam |
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| Abstract: | ZnS:Cr (3 at.%) nanoparticles were synthesized by chemical co-precipitation method using EDTA as capping agent. The samples were annealed in air for 3 h in steps of 100 °C in the temperature range of 200–700 °C. The effect of annealing temperatures on the structural and photoluminescence properties of Cr doped ZnS nanoparticles was investigated using X-ray Diffraction (XRD), a Scanning Electron Microscope (SEM), Energy Dispersive X-ray spectroscopy (EDS), Diffuse Reflectance Spectra (DRS), Vibrating Sample Magnetometer (VSM) and Photoluminescence (PL) techniques. EDS spectra confirmed the presence of Cr in the samples with expected stoichiometry. XRD studies confirmed the formation of ZnO above 500 °C. Photoluminescence studies on ZnS:Cr nanoparticles indicated that the emission wavelength is tunable in the range of 440–675 nm as a function of annealing temperature. VSM results indicated a decrease in ferromagnetism with increase in annealing temperature, perhaps due to appreciable variation in structural defects that are sensitive to annealing temperature. |
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