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Patil, Jyoti V.,Mali, Sawanta S.,Shaikh, Jasmin S.,Patil, Akhilesh P.,Patil, Pramod S.,Hong, Chang Kook Elsevier 2019 Synthetic metals Vol.256 No.-
<P><B>Abstract</B></P> <P>In this study, the highly efficient organic indoline DN350 based dye sensitized solar cells (DSSCs) have been fabricated using reduced graphene oxide (rGO)-TiO<SUB>2</SUB> composite nanofibers (NFs) and tested its photovoltaic properties. The influence of the rGO on the morphology, structural properties of the TiO<SUB>2</SUB> NFs have been characterized by various techniques. Our photovoltaic results revealed that the modified rGO-TiO<SUB>2</SUB> composite NFs exhibited higher power conversion efficiency (PCE) in comparison with the pristine-TiO<SUB>2</SUB> NFs. The electrochemical analysis indicated that the GO content provides more active sites results in higher dye adsorption which consequently improves the DSSCs performance. Our optimized sample containing 4 mg-rGO-TiO<SUB>2</SUB> NFs exhibited the best performance with 4.43% PCE, which is higher than the pristine-TiO<SUB>2</SUB> NFs (3.83%). Overall, this study presents the rGO-TiO<SUB>2</SUB> composite NFs as a novel strategy for enhancing the efficiency of the organic indoline DN350 based DSSCs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electrospun reduced graphene oxide (rGO)-TiO<SUB>2</SUB> composite nanofibers. </LI> <LI> rGO-TiO<SUB>2</SUB> composite nanofibers for organic indoline DN350 DSSCs. </LI> <LI> The 4.42% power conversion efficiency achieved for DSSC. </LI> </UL> </P>
Ashwini Patil,Yogesh Pore,Yogesh Gavhane,Shitalkumar Patil,Sachinkumar Patil 한국약제학회 2014 Journal of Pharmaceutical Investigation Vol.44 No.3
Spherical agglomerates of ezetimibe (EZT)were prepared with hydrophilic polymers; polyvinyl pyrrolidoneK30 (PVP) and/or poloxamer 188 (poloxamer) atdrug to polymer ratios of 1:1 (w/w) by spherical crystallizationtechnique, in order to improve its physicochemicaland micromeritic properties. Three different bridging liquids;chloroform, dichloromethane and/or ethyl acetatealong with good solvent acetone and poor solvent waterwere used to form six batches of agglomerates. Initialcharacterization of all batches in terms of micromeritic andphysicochemical properties resulted in optimization of (A3,EZT:PVP:ethyl acetate) and (B3, EZT:poloxamer:ethylacetate) batches and hence further investigated for drug–polymer interaction, crystallinity and morphology usingFTIR, XRPD, DSC and SEM techniques. The resultsindicated presence of hydrogen bonding, crystallinity andspherical shape in agglomerates. Therefore, the optimizedagglomerates (B3) were directly compressed into tablet. Unfortunately, drug release from the tablet was not satisfactory,suggesting a need of disintegrant from dissolutionpoint of view. Therefore, these agglomerates were recompressedincorporating certain excipients and evaluated asper pharmacopoeia. The dissolution rate of prepared tabletwas similar to that of marketed tablet (p[0.05). It couldbe concluded that spherical crystallization could be one ofthe effective and alternative approaches for improvedperformance of EZT and its tablet formulation.
Patil, D.S.,Pawar, S.A.,Devan, R.S.,Mali, S.S.,Gang, M.G.,Ma, Y.R.,Hong, C.K.,Kim, J.H.,Patil, P.S. Elsevier Sequoia 2014 Journal of electroanalytical chemistry Vol.724 No.-
The composite thin films of Silver-activated carbon/polyaniline (Ag-AC/PANI) have been deposited on stainless steel substrates by a facile dip coating technique. The formation of Ag-AC/PANI electrode is analyzed by Fourier transform infrared, Fourier transform-Raman and X-ray photoelectron spectroscopy techniques. Field Emission Scanning Electron Microscopy revealed the presence of Ag nanoparticles on the porous spongy background of PANI. The highest specific capacitance of 567Fg<SUP>-1</SUP>at 5mVs<SUP>-1</SUP> and energy density of 86.30Whkg<SUP>-1</SUP> at 1mAcm<SUP>-2</SUP> is observed for the Ag-AC/PANI indicating positive synergistic effect of silver, activated carbon and PANI. In which silver nanoparticles help in improving the electronic conductivity and activated carbon enhances the electrochemical stability of the PANI electrodes.
Enhanced photoelectrocatalytic water oxidation using CoPi modified GaN/MWCNTs composite photoanodes
Patil, Santosh S.,Johar, Muhammad A.,Hassan, Mostafa A.,Patil, Deepak R.,Ryu, Sang-Wan Elsevier 2019 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.178 No.-
<P><B>Abstract</B></P> <P>GaN is promising material for photoelectrochemical (PEC) water oxidation owing to its adjustable band gap and suitable band edge locations, which straddle the H<SUP>+</SUP>/H<SUB>2</SUB> and O<SUB>2</SUB>/H<SUB>2</SUB>O redox conditions. However, due to its wide band gap and unavoidable surface defects, the PEC conversion efficiency of GaN is insufficient to be used for practical applications. To improve the PEC efficiency of GaN, we report fabrication of a cobalt phosphate (CoPi)-modified GaN/multiwall carbon nanotube (MWCNT) composite photoanode through combination of metal organic chemical vapor deposition, dip and dry methods, and electrodeposition. Here, GaN photoanodes with different MWCNT surface coverages were obtained by cost effective ‘dip and dry’ method. Different deposition cycles were performed to prepare a series of samples, which were evaluated for their photoelectrochemical water oxidation. The highest photocurrent density (<I>J</I> <SUB>ph</SUB>) of 2.23 mA/cm<SUP>2</SUP> at (0 V vs. Pt electrode) was achieved in a sample with moderate incorporation of MWCNTs, formed by through three cycles of the dip and dry coating (i.e., GaN/MWCNT 3T). We attribute this result to the MWCNTs facilitating light sensitization. However, excessive MWCNT loading produced a shielding effect, which lowered the photocurrent density, and an undesirable two-plateau photocurrent behavior indicating sluggish reaction kinetics. The maximum photocurrent density <I>J</I> <SUB>ph</SUB> of 2.81 mA/cm<SUP>2</SUP>, (vs. Pt electrode) with solar to hydrogen conversion efficiency 0.91% was achieved for GaN/MWCNTs 3T/CoPi ternary composite photoanode, which was approximately 2.51 and 1.26 times as high as that of bare GaN and GaN/MWCNTs 3T photoanodes.</P> <P><B>Highlights:</B></P> <P> <UL> <LI> Combining GaN with MWCNTs improves the light harvesting capability. </LI> <LI> Large amount of MWCNTs negatively affected PEC performance. </LI> <LI> The GaN/MWCNTs/CoPi composite photoanode promises unassisted water splitting. </LI> <LI> The PEC activity was improved, approximately 2.51 times higher compare to bare GaN. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Patil, Vaishali,Patil, Arun,Yoon, Seok-Jin,Choi, Ji-Won American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.5
<P>During last two decades, lithium-based glasses have been studied extensively as electrolytes for solid-state secondary batteries. For practical use, solid electrolyte must have high ionic conductivity as well as chemical, thermal and electrochemical stability. Recent progresses have focused on glass electrolytes due to advantages over crystalline solid. Glass electrolytes are generally classified into two types oxide glass and sulfide glass. Oxide glasses do not react with electrode materials and this chemical inertness is advantageous for cycle performances of battery. In this study, major effort has been focused on the improvement of the ion conductivity of nanosized LiAlTi(PO4)3 oxide electrolyte prepared by mechanical milling (MM) method. After heating at 1000 degrees C the material shows good crystallinity and ionic conductivity with low electronic conductivity. In LiTi2(PO4)3, Ti4+ ions are partially substituted by Al3+ ions by heat-treatment of Li20-Al2O3-TiO2-P2O5 glasses at 1000 degrees C for 10 h. The conductivity of this material is 1.09 x 10(-3) S/cm at room temp. The glass-ceramics show fast ion conduction and low E(a) value. It is suggested that high conductivity, easy fabrication and low cost make this glass-ceramics promising to be used as inorganic solid electrolyte for all-solid-state Li rechargeable batteries.</P>
Gas sensing properties of 3D mesoporous nanostructured ZnO thin films
Patil, V. L.,Kumbhar, S. S.,Vanalakar, S. A.,Tarwal, N. L.,Mali, S. S.,Kim, J. H.,Patil, P. S. The Royal Society of Chemistry 2018 New journal of chemistry Vol.42 No.16
<P>Advancing the properties of selective and sensitive metal oxide based gas sensors is a challenging research topic for the detection of toxic, and pollutant gases. In the present research, we successfully deposited a three dimensional (3D) mesoporous ZnO nanostructure on a glass substrate by using a hydrothermal method, and tested the material for its gas sensing performance. These 3D mesoporous ZnO nanostructures were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and photoluminescence techniques. Gas sensing performance analysis was carried out for nitrogen dioxide (NO2) gas at different temperatures and concentrations. The 3D mesoporous ZnO nanostructure revealed excellent gas sensing performance for NO2 gas because of its large surface area. The larger surface area led to an increase in the gas sensitivity. In addition, the sensor based on the 3D mesoporous ZnO nanostructure could be used at a low operating temperature of 150 °C. This work suggests that the 3D mesoporous ZnO nanostructure is a versatile material for NO2 gas sensing applications.</P>
Enhanced magnetoelectric coupling in stretch-induced shear mode magnetoelectric composites
Patil Deepak Rajaram,Park Sung Hoon,Patil Seema,Kumar Ajeet,Ryu Jungho 한국세라믹학회 2021 한국세라믹학회지 Vol.58 No.6
Magnetoelectric (ME) laminates consisting of Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMN-PT)-based single crystals have recently attracted significant interest owing to their excellent piezoelectric properties. Particularly, ME laminates with d 15 -mode single crystals exhibit the strongest ME coupling, but the fabrication of ME laminates with 15 shear modes is challenging. Herein, we propose the generation of a stretch–shear mode ( d 15 -mode) by clamping the opposite ends of the top and bottom magnetostrictive layers in symmetric ME laminates. Two diff erent shear-stress-induced ME laminates were fabricated using Metglas/Galfenol as magnetostrictive layer, and 15-PMN-PZT as a piezoelectric layer. The ME laminates were studied under two different conditions, unclamped and clamped. Under unclamped condition, Galfenol/15-PMN-PZT/Galfenol (Metglas/15- PMN-PZT/Metglas) laminate showed maximum α ME value of 1.71 V/cm∙Oe (0.62 V/cm∙Oe), while under clamped condition, Galfenol/ d 15 -PMN-PZT/Galfenol (Metglas/15-PMN-PZT/Metglas) laminate exhibited an enhanced α ME value of 2.40 V/ cm∙Oe (0.87 V/cm∙Oe), indicating successful generation of the stretch–shear mode. Under clamped condition, α ME was enhanced by 140% compared with the that of the unclamped case, suggesting a 40% (0.25 V/cm∙Oe) contribution from the pure shear ME voltage coefficient along with the longitudinal extension contribution.