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RISS 인기검색어
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- 저자 : O. MONDAL (검색결과 2 건)
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PREPARATION AND MICROSTRUCTURAL CHARACTERIZATION OF NANOCRYSTALLINE Mn-DOPED ZnO
B. ROY,O. MONDAL,A. DEB,S. P. SENGUPTA,P. CHATERJEE,M. PAL 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.4
Mn-doped ZnO, a dilute magnetic semiconductor (DMS), has been prepared in nanocrystalline form by using a soft chemical route. The concurrent diffusional growth of both nanocrystalline Mn-doped ZnO and secondary spinel phase ZnMn_2O_4 in annealed samples have been studied by using a modified Rietveld method and transmission electron microscope (TEM). Rietveld analysis reveals that both the compounds start growing when Mn concentration is lower and the volume fraction of crystalline spinel phase ZnMn_2O_4 decreases sharply when Mn concentration increases. TEM study indicates that average particle sizes of both the phases are in nanometer dimensions and are highly crystalline in nature. Magnetization increases initially and then almost saturates with the increase of Mn concentration. The enhanced magnetization could be a combined effect of Mn ions and surface ferromagnetism of nanoparticles.
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EFFECT OF Mn DOPING ON MICROSTRUCTURE AND OPTICAL PROPERTIES OF NANOCRYSTALLINE ZnO
M. KARMAKAR,O. MONDAL,B. ROY,P. K. PAUL,M. PAL 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.6
Mn-doped ZnO has emerged as the most studied system for prototype applications in spintronics devices because of its interesting magnetic properties. In this report, nanocrystalline ZnO doped with various concentration of Mn have been synthesized from different precursors using modified ceramic route. Samples are characterized by using X-ray diffractometer (XRD), high resolution transmission electron microscopy (HRTEM) and UV-Vis spectrophotometer. XRD and HRTEM studies confirm the growth of single phase, well crystallized Mn-doped ZnO nanoparticles. Particle size estimated from Rietveld analysis as well as TEM images show a decreasing tendency with the increase in Mn concentration. We observe both band bowing and red shift in optical bandgap by varying the concentration of Mn and precursors. This study demonstrates that Mn concentration is not the only factor but precursors have a definite role on the variation of optical bandgap.
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