Bharati Panigrahy

Publications (2)3.98 Total impact

• Article: Effect of Fe doping concentration on optical and magnetic properties of ZnO nanorods.

  Bharati Panigrahy, M Aslam, D Bahadur
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  ABSTRACT: Herein, a facile low temperature, aqueous solution-based chemical method has been demonstrated for large-scale fabrication of Fe doped ZnO nanorods (ZnO:Fe) with a series percentage of Fe dopant. Interestingly, the SEM results reveal a uniform well dispersed synthesis of ZnO:Fe nanorods throughout the substrate. The x-ray diffraction result suggests that Fe substitutes Zn in the ZnO matrix and rules out the formation of any secondary phase. Selected area electron diffraction investigation verifies the single crystal, hexagonal wurtzite structure of the ZnO:Fe nanorods. Energy dispersive spectroscopy data confirm Fe doping of the ZnO nanorods with a concentration ranging from 0.9 to 2.2 at.%. The photoluminescence spectrum reveals a continuous suppression of defect related broad-band emission (I(D)/I(UV) = 1-0.11) by increasing the concentration of the dopant ion, which produces the quenching of surface defects present in the nanostructures. An enhancement in ferromagnetism (M = 0.15 × 10⁻²-0.24 × 10⁻¹ emu g⁻¹ at 2000 Oe) is found in doped ZnO nanorods.
  Nanotechnology 03/2012; 23(11):115601. · 3.98 Impact Factor
• Article: Aqueous Synthesis of Mn- and Co-Doped ZnO Nanorods

  Bharati Panigrahy, M. Aslam, D. Bahadur
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  ABSTRACT: Herein, we report the optical and magnetic properties of Mn- and Co-doped ZnO nanorods fabricated via a simple one-step aqueous-based chemical method. Interestingly, SEM results reveal a uniform size distribution of the nanorods throughout the substrate. The UV emission band of doped ZnO nanorods reveals a red shift from 382 to 384.5 nm, indicating a band-edge bending due to the dopants. The defect-related band centered at 600 nm is suppressed (ID/IUV = 1−0.35) considerably in doped nanorods, revealing the quenching of surface defects present in the nanostructures. XRD, XPS, Raman spectra, and EDS data demonstrate a successful incorporation of TM dopants in ZnO nanorods. Localized SAED patterns taken using nanoprobe size reveals that the nanorods are single crystals, grown along the c-axis [0002] direction. A systematic evalution of the enhancement in ferromagnetism (M = 0.15 × 10−2 to 1.3 × 10−2 emu/g) is found in modified doped ZnO nanorods.
  06/2010;