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        Room-temperature Ferromagnetism in Cu-doped ZnO Nanorods Prepared Using a Microwave Irradiation Method

        Faheem Ahmed,샤런드라쿠마르,Nishat Arshi,M. S. Anwar,허시내,김근우,여준청,구본흔,Hoa Hong Nguyen 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10

        We report the observation of room temperature ferromagnetism in Cu-doped ZnO nanorods prepared by microwave irradiation technique. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results showed that Cu-doped ZnO comprise a single phase nature with wurtzite structure and Cu ions were successfully incorporated into the lattice position of Zn ions in ZnO matrix. Field emission scanning electron microscopy (FESEM) and TEM micrographs suggested that the size of Cu-doped ZnO nanorods ranges from 50 to 70 nm in diameter and 300 to 400 nm in length, respectively. The selected area electron diffraction (SAED) pattern infer that the Cu-ZnO nanorods have single phase nature with preferentially growth direction along [0 0 1] plane. Raman scattering spectra of Cu-doped ZnO nanorods revealed the blue shift of <I>E<SUB>2</SUB></I><SUP>high</SUP> mode that is related to the vibration of oxygen atoms in wurtzite ZnO, suggested the successful doping of Cu at Zn site into ZnO. Magnetization measurements showed that the nanorods exhibit room temperature ferromagnetism.

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        NOVEL AND COST-EFFECTIVE SYNTHESIS OF SILVER NANOCRYSTALS: A GREEN SYNTHESIS

        NISHAT ARSHI,FAHEEM AHMED,M. S. ANWAR,SHALENDRA KUMAR,구본흔,여준청,CHAN GYU LEE 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.4

        This paper reports the study on the synthesis and characterization of silver nanocrystals by a two-step synthesis procedure. The first step is the solution-free hand grinding of silver foil and sugar at room temperature for few minutes. The second step is the thermal decomposition of silver/sugar composite to form silver nanocrystals. The as-synthesized silver nanocrystals were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet visible (UV/Vis) spectroscopy, atomic force microscopy (AFM) and transmission electron microscopy (TEM) studies. The XRD pattern showed a face-centered cubic structure (single phase) with high crystallinity. The lattice parameters calculated from XRD pattern were found to be a = 4.12 Å for silver nanocrystals with average grain size of ~ 19 nm. The energy dispersive analysis of X-rays (EDAX) of silver nanocrystals confirmed the presence of silver and no peak of any secondary phase was detected. FESEM and AFM studies showed that the crystals have cube-like morphology. TEM results showed that the size of silver nanocrystals was found to be ~ 22 nm. This novel synthesis route, not reported earlier, would be a promising candidate for a variety of future applications of silver nanocrystals.

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