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N.B. Pawar,S.S. Mali,S.D. Kharade,M.G. Gang,P.S. Patil,김진혁,C.K. Hong,P.N. Bhosale 한국물리학회 2014 Current Applied Physics Vol.14 No.3
In the present paper we report structural, optical, morphological and electrical properties of thin films of MoBi2S5 prepared by facile self organized arrested precipitation technique (APT) from aqueous alkaline bath. X-ray diffraction study on thin films suggests orthorhombic and rhombohedral mixed phase structure. The samples are further annealed under vacuum at 373 and 473 K. The EDS pattern shows minor loss of sulphur upto 473 K. The optical absorption in visible region shows direct allowed transition with band gap variation over 1.2e1.1 eV. Post-heat treated samples exhibit n-type electrical conductivity. SEM images show uniform distribution of spherical grains with diameter w200 nm for as-synthesized MoBi2S5 thin film. The grain size increases with annealing temperature and morphology becomes more compact due to crystallization of thin film. The surface roughness deduced from AFM, was in the range of 1.29e1.92 nm. The MoBi2S5 thin films are employed for the fabrication of photoelectrochemical solar cells as all the samples exhibit strong absorption in visible to near IR region. Due to vacuum annealing it gives a significant enhancement of power conversion efficiency (h) upto 0.14% as compared to as-synthesized MoBi2S5 thin film.
Pawar, N.B.,Mali, S.S.,Kharade, S.D.,Gang, M.G.,Patil, P.S.,Kim, J.H.,Hong, C.K.,Bhosale, P.N. Elsevier 2014 Current Applied Physics Vol.14 No.3
In the present paper we report structural, optical, morphological and electrical properties of thin films of MoBi<SUB>2</SUB>S<SUB>5</SUB> prepared by facile self organized arrested precipitation technique (APT) from aqueous alkaline bath. X-ray diffraction study on thin films suggests orthorhombic and rhombohedral mixed phase structure. The samples are further annealed under vacuum at 373 and 473 K. The EDS pattern shows minor loss of sulphur upto 473 K. The optical absorption in visible region shows direct allowed transition with band gap variation over 1.2-1.1 eV. Post-heat treated samples exhibit n-type electrical conductivity. SEM images show uniform distribution of spherical grains with diameter ~200 nm for as-synthesized MoBi<SUB>2</SUB>S<SUB>5</SUB> thin film. The grain size increases with annealing temperature and morphology becomes more compact due to crystallization of thin film. The surface roughness deduced from AFM, was in the range of 1.29-1.92 nm. The MoBi<SUB>2</SUB>S<SUB>5</SUB> thin films are employed for the fabrication of photoelectrochemical solar cells as all the samples exhibit strong absorption in visible to near IR region. Due to vacuum annealing it gives a significant enhancement of power conversion efficiency (η) upto 0.14% as compared to as-synthesized MoBi<SUB>2</SUB>S<SUB>5</SUB> thin film.
Kondalkar, Vijay V.,Mali, Sawanta S.,Mane, Rahul M.,Dandge, P. B.,Choudhury, Sipra,Hong, Chang K.,Patil, Pramod S.,Patil, Shivajirao R.,Kim, Jin H.,Bhosale, Popatrao N. American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.47
<P>Nanostructured TiO<SUB>2</SUB> thin films were fabricated via a facile, economical, and energy-efficient microwave-assisted dip-coating (MWDC) technique. Further, the resulting TiO<SUB>2</SUB> films were characterized by means of X-ray diffraction, high-resolution transmission electron microscopy, selected-area electron diffraction, Fourier transform Raman spectroscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy techniques for their phase structure, morphology, and optical and surface properties. TiO<SUB>2</SUB>-mediated photoelectrocatalytic degradation of the antibiotic cefotaxime (CFX) in an aqueous solution was studied by varying the pH under UV illumination. The degradation intermediates and possible reaction degradation path of CFX were analyzed by electrospray ionization time-of-flight mass spectrometry (MS). The MS spectra revealed that degradation of CFX occurs through β-lactum corresponding to the cleavage of the cephem nucleus. Moreover, the antibacterial activity of CFX prior to and after photoelectrocatalytic degradation was carried out to analyze the toxicity against <I>Staphylococcus aureus</I> and salmonella typhi bacteria. Interestingly, it was observed that the antibiotic activity was drastically inhibited after photoelectrocatalytic degradation of the CFX solution. The photoelectrocatalytic stability of a nanostructured TiO<SUB>2</SUB> electrode was evaluated by recycling the degradation experiments. It was observed that there was no significant decrease in the catalytic activity, indicating potential applications of the TiO<SUB>2</SUB> electrode prepared by the MWDC method.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/iecred/2014/iecred.2014.53.issue-47/ie501821a/production/images/medium/ie-2014-01821a_0014.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie501821a'>ACS Electronic Supporting Info</A></P>
Bagade, C. S.,Ghanwat, V. B.,Mali, S. S.,Khot, K. V.,Hong, C. K.,Bhosale, P. N. Springer Science + Business Media 2016 Journal of materials science Materials in electron Vol.27 No.6
<P>In the present work, we have synthesized nanocrystalline (CdZn) Se thin films by a simple and cost effective arrested precipitation technique. Systematic characterization of optostructural, morphological, compositional and photoelectrochemical property has been carried out. The optical band gap was evaluated from optical absorption spectra by using UV-Vis-NIR spectrophotometer. Estimated optical band gap lies in the range of 1.90-2.07 eV. X-ray diffraction pattern reveals that the deposited thin films were nanocrystalline in nature and exhibit cubic crystal structure. The dependency of microstructural parameters such as crystallite size, microstrain and dislocation density has been studied. Scanning electron microscopy images demonstrates that surface morphology can be improved with respect to deposition time. X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy confirmed that composition and stoichiometry of (CdZn) Se thin films. A maximum photo conversion efficiency 0.73 % was achieved in the (CdZn) Se cauliflower thin film based solar cell.</P>
Novel synthesis of efficient counter electrode by facile arrested precipitation technique (APT)
Jadhav, S. S.,Mali, S. S.,Hong, C. K.,Patil, P. S.,Bhosale, P. N.,Mulik, G. N. Springer Science + Business Media 2016 Journal of materials science. Materials in electro Vol.27 No.4
<P>In the present investigation, we have successfully synthesized nanogranular thin film of copper sulfoselenide Cu-2(S, Se) as efficient counter electrode to CdS0.7Se0.3 photoanode by facile arrested precipitation technique (APT). The deposited photoanode was annealed at 150 A degrees C in vacuum oven and used for further characterization. Optical absorption study suggested the band gap energy of photoanode is 1.75 eV. X-ray diffraction results indicate that APT is a favorable technique to synthesize pure nanocrystalline CdS0.7Se0.3 thin films having hexagonal crystal structure. An electrochemical impedance spectroscopy analysis confirms the charge transfer resistance. X-ray photoelectron spectroscopy reveals stoichiometry at valance state of Cu-2(S, Se) counter and CdS0.7Se0.3 photoanode. The enhanced photoconversion efficiency achieved was 0.42 % for this counter electrode due to systematic study.</P>
Effect of substrate on the nanostructured Bi2Se3 thin films for solar cell applications
Desai, N. D.,Ghanwat, V. B.,Khot, K. V.,Mali, S. S.,Hong, C. K.,Bhosale, P. N. Springer Science + Business Media 2016 Journal of materials science Materials in electron Vol.27 No.3
<P>In this article, we are reporting the effect of different substrates on the growth of nanostructured bismuth selenide (Bi2Se3) thin films for photoelectrochemical (PEC) application. Three different substrates are used such as glass, indium doped tin oxide (ITO) and fluorine doped tin oxide (FTO) for the deposition of Bi2Se3 thin film using arrested precipitation technique at room temperature (300 K). The optical, structural, morphological, compositional and PEC properties of Bi2Se3 thin films were studied by using various characterization techniques such as UV-Vis-NIR, X-ray diffraction, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray photoelectron spectroscopy and PEC as a function of different substrates. Finally, the PEC performance of deposited thin films shows highest conversion efficiency 0.14 % for Bi2Se3 thin films deposited on FTO coated substrate surface.</P>
Patil, P.B.,Mali, S.S.,Kondalkar, V.V.,Mane, R.M.,Patil, P.S.,Hong, C.K.,Bhosale, P.N. Elsevier Sequoia 2015 Journal of Electroanalytical Chemistry Vol.758 No.-
Bismuth telluride (Bi<SUB>2</SUB>Te<SUB>3</SUB>) thin films have been proved to be important materials for thermoelectric application. Rapid development of photovoltaic materials has raised new hopes due to directly converting sun light to electricity. We report here a simple electrochemical synthesis route for the preparation of well-defined Bi<SUB>2</SUB>Te<SUB>3</SUB> nanostructures for photoelectrochemical solar cell application. Classification of crystal structure, surface morphology and elemental composition of resulting deposits were methodically characterized by X-ray diffraction (XRD) pattern, Raman spectroscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM) and its photoelectrochemical performance (PEC). The potential range and electrochemical reactions relevant to the growth of Bi<SUB>2</SUB>Te<SUB>3</SUB> thin films were studied by cyclic voltammetry (CV). Furthermore, the influence of deposition variables such as applied deposition potential and effect of different surfactants (cationic, anionic and non-ionic) on morphology, crystal orientation associated with the film growth and photoelectrochemical performance were investigated systematically. The photoelectrochemical conversion efficiency recorded for Bi<SUB>2</SUB>Te<SUB>3</SUB> is 0.083%.
Novel synthesis of interconnected nanocubic PbS thin films by facile aqueous chemical route
Khot, K. V.,Mali, S. S.,Pawar, N. B.,Mane, R. M.,Kondalkar, V. V.,Ghanwat, V. B.,Patil, P. S.,Hong, Chang Kook,Kim, Jin Hyeok,Heo, Jaeyeong,Bhosale, P. N. Springer-Verlag 2014 Journal of materials science Materials in electron Vol.25 No.9