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- 저자 : V.L. Mathe (검색결과 4 건)
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Magnetodielectric Properties of La0.67Sr0.33MnO3 and Ba0.7Sr0.3TiO3 Thin Film Heterostructures
Arjun Tarale,Y.D. Kolekar,V.L. Mathe,S.B. Kulkarni,V.R. Reddy,Pradeep Joshi 대한금속·재료학회 2012 ELECTRONIC MATERIALS LETTERS Vol.8 No.4
The paper discuses synthesis and magnetodielectric properties of La0.67Sr0.33MnO3 (LSMO), Ba0.7Sr0.3TiO3 (BST),and BST/LSMO thin film heterostructures. The XRD spectra are determined for confirmation of the crystal structure of LSMO, BST and formation of a pure bi-phase composite. The paper presents variation of Cp and tanδ as a function of frequency between 100 Hz to 1 MHz and applied magnetic field up to 0.6 T. The observed variation of Cp, tanδ, magnetocapacitance and impedance spectra are analyzed in terms of a possible equivalent circuit model. The present analysis shows that the method of impedance spectra could be used to separate out the possible contributions.
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Hunge, Y.M.,Yadav, A.A.,Mahadik, M.A.,Mathe, V.L.,Bhosale, C.H. Elsevier 2018 Journal of the Taiwan Institute of Chemical Engine Vol.85 No.-
<P><B>Abstract</B></P> <P>In present article, WO<SUB>3</SUB> thin films have been successfully synthesized by chemical spray pyrolysis approach. The effect of spraying quantity of solution onto the photoelectrochemical (PEC), structural, morphological, and optical properties has been studied. Film prepared at 40 ml solution quantity shows the excellent photoelectrochemical performance (<I>I</I> <SUB>sc</SUB> <SUB> </SUB>= 0.69 mA/cm<SUP>2</SUP> and <I>V</I> <SUB>oc</SUB> = 0.64 V) in 0.05 M concentrated H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. X-ray diffraction studies reveal that the synthesized WO<SUB>3</SUB> thin films are polycrystalline with monoclinic crystal structure. The chief vibrational modes of the WO<SUB>3</SUB> sample, located at 712.64 and 804.28 cm<SUP>−1</SUP> corresponding to the stretching and the bending of OWO bond respectively and are consistent with a monoclinic structure. The estimated band gap energy of WO<SUB>3</SUB> thin films varies from 2.37 to 2.45 eV with respect to quantities of spraying solution and it exhibits absorption in visible region. Film shows a maximum specific surface area of 31.63 m<SUP>2</SUP>/g. Photoelectrocatalytic degradation of brilliant blue dye in aqueous solutions is studied. The end result shows that the degradation percentage of brilliant blue using WO<SUB>3</SUB> photoelectrode has reached 92% under visible light illumination after 240 min. The enhancement in photoelectrocatalytic activity of optimized 40 ml WO<SUB>3</SUB> sample is mainly due to the suppressed the recombination rate of photogenerated electron–hole pairs. This study provides an effective WO<SUB>3</SUB> photoelectrode for removing of organic pollutants present in the water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Monoclinic WO<SUB>3</SUB> homogeneous thin films prepared by the simple, cost-effective, eco-friendly spray pyrolysis approach. </LI> <LI> Photoelectrode with 710 nm thickness display superior photocatalytic degradation of brilliant blue dye. </LI> <LI> Degradation rate constant was 0.2238 cm<SUP>3</SUP>/s for BB under visible-light illumination. </LI> <LI> Decreased COD values from 76 to 16 mg/l confirm the mineralization of the BB dye molecule. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Hunge, Y.M.,Yadav, A.A.,Mahadik, M.A.,Bulakhe, R.N.,Shim, J.J.,Mathe, V.L.,Bhosale, C.H. Elsevier 2018 Optical materials Vol.76 No.-
<P><B>Abstract</B></P> <P>The need to utilize TiO<SUB>2</SUB> based metal oxide hetero nanostructures for the degradation of environmental pollutants like Rhodamine B and reactive red 152 from the wastewater using stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB> catalyst under sunlight illumination. WO<SUB>3</SUB>, TiO<SUB>2</SUB> and stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB> catalysts were prepared by a spray pyrolysis method. It was found that the stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB> heterostructure has high crystallinity, no mixed phase formation occurs, strong optical absorption in the visible region of the solar spectrum, and large surface area. The photocatalytic activity was tested for degradation of Rhodamine B (Rh B) and reactive red 152 in an aqueous medium. TiO<SUB>2</SUB> layer in stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB> catalyst helps to extend its absorption spectrum in the solar light region. Rh B and Reactive red 152is eliminated up to 98 and 94% within the 30 and 40 min respectively at optimum experimental condition by stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB>. Moreover, stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB> photoelectrode has good stability and reusability than individual TiO<SUB>2</SUB> and WO<SUB>3</SUB> thin film in the degradation of Rh B and reactive red 152. The photoelectrocatalytic experimental results indicate that stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB> photoelectrode is a promising material for dye removal.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Enhanced photoelectrocatalytic activity of sprayed deposited stratified WO<SUB>3</SUB>/TiO<SUB>2</SUB> thin films. </LI> <LI> Photoelectrocatalytic degradation of rhodamine B and reactive red 152 dye. </LI> <LI> Reaction kinetics and degradation of pollutants by COD measurement. </LI> </UL> </P>
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