Electronic and magnetic structural investigation of vanadium doped ZnO nanostructure

Title
Electronic and magnetic structural investigation of vanadium doped ZnO nanostructure
Authors
채근화씽 지텐드라리차Navdeep GoyalSanjeev Gautam
Keywords
ZnO nanostructure; RTFM; NEXAFS; Photoluminescence; Bandgap engineering
Issue Date
2018-12
Publisher
Vacuum
Citation
VOL 158-262
Abstract
In the present work, vanadium doped ZnO nanostructure, Zn1-xVxO (x  =  0.00, 0.01, 0.02, 0.03) have been synthesized using sol-gel route. Rietveld refined X-ray diffraction confirms the single wurtzite phase for all the prepared samples with crystallite size ranging from 20 to 40  nm. UV-Diffuse reflectance spectroscopy shows the decrease in band gap energy from 3.20 to 3.17  eV on V doping and and Photoluminescence (PL) measurements has a strong visible emission region in the range 500– 700  nm. PL broad peak in the visible region is further deconvoluted to study the defect states in the V:ZnO system. V doped ZnO nanostructure shows the room temperature ferromagnetism measured through Vibrating Sample Magnetometer hysteresis curve. The magnetic moment (μB) is found to vary from 0.012 to 0.018 μB per V-atom as x changes from 0.01 to 0.03 in Zn1-xVxO matrix. Magnetic structure properties are correlated with electronic transitions at different atomic levels using near-edge X-ray absorption fine-structure (NEXAFS) spectroscopy. NEXAFS spectral features at OK-, V/Zn L3,2- edge reveals the hybridization of V(3d)-O(2p) orbitals and absence of V-metallic clusters in V:ZnO system. These investigations further envisage the existence of +5 state of vanadium in Zn1-xVxO nanostructure.
URI
http://pubs.kist.re.kr/handle/201004/68453
ISSN
0042-207X
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