Defect induced paramagnetism in lightly doped ZnS:Fe nanoparticles |
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| Institution: | 1. Department of Physics, Sri Venkateswara University, Tirupati 517 502, India;2. Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea;3. Department of BIN Fusion Technology & Department of Polymer-Nano Science and Technology, Chonbuk National University, Korea;1. Key Laboratory of Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, China;2. College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin 150025, China;3. College of Education of Heilongjiang, Harbin 150080, China;1. Dept. of Physics, Sri Venkateswara University, Tirupati, India;2. Dept. of Physics, Hankuk University of Foreign Studies, Yongin 449-791, South Korea;3. Dept. of Physics, Pukyong National University, Busan 608-737, South Korea;1. School of Materials and Mechanical and Electrical Engineering, Jiangxi Science and Technology Normal University, Nanchang 330013, PR China;2. Institute of Functional Materials, Jiangxi University of Finance and Economics, Nanchang 330013, PR China;3. School of Materials Science and Engineering, Nanchang University, Nanchang 330031, PR China;4. School of Materials, Anshan University of Science and Technology, Anshan 114051, PR China;1. Department of Physics, Sri Venkateswara University, Tirupati 517502, India;2. Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea;3. Department of BIN Fusion Technology & Department of Polymer-Nano Science and Technology, Chonbuk National University, Jeonju, Jeonbuk, Republic of Korea;1. School of Pure and Applied Physics, Mahatma Gandhi University, Kottayam 686560, India;2. Department of Optoelectronics, University of Kerala, Kariavattom, Thiruvananthapuram, Kerala 695581, India;1. Department of Physics, Sri Venkateswara University, Tirupati 517502, India.;2. Department of Chemistry and Chemical Institute for Functional Materials, Pusan National University, Busan 609-735, Republic of Korea |
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| Abstract: | Nanoparticles of ZnS:Fe (0, 1, 3, and 5 at%) were synthesized by a refluxing route at 80 °C. All the samples exhibited cubic structure as revealed by X-ray powder diffraction studies. Blue emission of undoped samples was totally quenched by Fe doping. Magnetic measurements showed that the undoped ZnS was diamagnetic whereas all the doped samples were paramagnetic at room temperature. EPR signal characteristic of Fe3+ was observed in all the doped samples at room temperature. The paramagnetism of the present samples is attributed to the presence of uncoupled Fe3+ ions mediated by cation vacancies. |
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| Keywords: | ZnS nanoparticles Photoluminescence Paramagnetism Optical properties |
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