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Co-DOPED ZnO NANOWIRES GROWN BY VAPOR–LIQUID–SOLID METHOD: STRUCTURAL, OPTICAL AND MAGNETIC STUDIES
BAPPADITYA PAL,SOUMEN DHARA,P. K. GIRI 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.4
We report on the growth of Co-doped ZnO nanowires (NWs) on Si substrate using a self-catalytic vapor deposition method from a Co-doped ZnO nanopowder source and study its structural, optical and magnetic properties for the as-grown and rapid thermal annealed samples. Co (5%)-doped ZnO (ZnCoO) nanoparticles (NPs) are used as source material for the growth process. Electron microscopy imaging clearly reveals the formation of long ZnO NWs with uniform diameter. X-ray di®raction analysis con¯rms the single crystalline hexagonal structure of Co-doped ZnO NWs without impurities of metallic cobalt or other phases. Micro-Raman studies of doped samples show doping/disorder induced additional modes as compared to the undoped ZnO. Room temperature photoluminescence spectra of the doped ZnO NWs show strong emission band at ?380 nm and no signi¯cant emission was observed in the visible region indicating low defect content in the NWs. The ¯eld dependent magnetization (M?Hcurve) measured at room temperature exhibits paramagnetic nature for the NWs with the magnetic moment in the range 2?3.7 milli-emu/cm2 for the applied ¯eld of 2 Tesla, while the source ZnCoO NPs exhibit room temperature ferromagnetism with saturation magnetization ?6 emu/g. Possible mechanism of alteration in magnetic behavior in doped NWs are discussed based on the growth conditions and role of defects.