Hydrothermal Synthesis and Characterization of Mn-Doped VO 2 Nanowires
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MRS Advances © 2019 Materials Research Society DOI: 10.1557/adv.2019.60
Hydrothermal Synthesis and Characterization of MnDoped VO2 Nanowires G. Long1, David Matatov1, Acher Suissa1, Elmustapha Feddi2, M. EL Yadri2, Kawtar Feddi3, and M. Sadoqi1,4 Department of Physics, St. John’s University, Queens, 11439, USA
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LaMCScI, Group of Optoelectronic of Semiconductors and Nanomaterials, ENSET, Mohammed V University in Rabat, 10000, Morocco 3
REAM Laboratory, International University of Rabat, 10000, Morocco Department of Pharmaceutical Sciences, St. John’s University, Queens, 11439, USA
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Abstract
Monoclinic VO2 is a known polymorph of vanadium dioxide that has received much attention due to its oxidative capabilities, geometric configuration, and promising applications in functional windows. VO2 can usually be obtained through a hydrothermal method under high pressure. In this work we report a synthesis of VO2 doped with Manganese using a rapid single-step hydrothermal process with V2O5, manganese (II) acetate and citric acid as precursors. Different syntheses were carried out in which the concentration of V 2O5 and citric acid remained constant whereas the concentration of manganese (II) acetate was varied. The reactants underwent a stirring phase for 30 minutes before being loaded into a hydrothermal reactor for 2.5 hours at 200°C. The resultant was washed three times to remove the residual precursors. Imaging and spectroscopy characterizations such as TEM, SEM and UV-VIS-NIR have been performed on different doping concentration and the results display a dependence on doping concentrations.
INTRODUCTION Due to their electron configurations, transition metal oxides have unique properties [1]. A few of the numerous functions of these transition metal oxides include materials for gas sensors, electro optical switching, and photocatalysis [2-4]. More specifically, vanadium based oxides have drawn interest for their properties such as metal-insulator transition (MIT) property, and considerable oxidation potential due to a high oxidation state [5-7]. Applications of these vanadium based oxides include redox catalysis, energy storage, and high performance supercapacitors [8-10]. Monoclinic
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polymorphs of vanadium dioxide (VO2) have geometrical structures permitting an MIT at a critical temperature as low as 340 K, relatively close to room temperature [5]. VO 2 (B) in particular is a known semiconducting polymorph of monoclinic VO 2 that has received much attention due to its potential as a precursor to other monoclinic polymorphs of VO2 as well as its energy storage functions [9,11]. More precisely, it has been shown to be a promising cathode material for aqueous lithium batteries [12]. Accordingly, VO2 (B) has uses for thermochromic smart windows, and cathode material [13,14].
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