Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 668, Issue -, Pages 87-90Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.01.208
Keywords
Diluted magnetic semiconductor; Nano-particles; C-doped ZnO; Metamagnetic transition
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Funding
- Vietnam National Foundation for Science and Technology Development (NAFOSTED) [103.01-2011.54]
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ZnO doping with Carbon (C-doped ZnO) materials were prepared by sol-gel technique following with a heat treatment process. Single phase of Wurtzite crystal structure of ZnO was concluded via x-ray diffraction (XRD) with a large amount of excess C tracking by energy dispersive X-ray spectroscopy (EDX) analysis. Two types of ZnO crystals (twinning particles) with different grain sizes and shapes were identified via scanning electron microscopy (FE-SEM). The first type has a smaller grain size of about 20 nm and hexagonal shape. And the second type has a larger grain size of about 80-120 nm and round shape. C substitutions of both Zn and O sites to form C-O and C-Zn bonds were conclusively confirmed via x-ray photoelectron spectroscope (XPS). Experimental evidences for the co-existence of different ferromagnetic phases in the materials are reported and discussed. Two Curie points at high temperatures (>500 degrees C) are presented. A metamagnetic transition was observed at magnetic field H = 19.2 kOe which was related to the co-existence of ferromagnetic phases. These involve in the formation of twinning C-doped ZnO nanoparticles. (C) 2016 Elsevier B.V. All rights reserved.
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