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Shaikh, S.,Kwon, H. C.,Yang, W.,Hwang, H.,Lee, H.,Lee, E.,Ma, S.,Moon, J. Royal Society of Chemistry 2016 Journal of Materials Chemistry A Vol.4 No.40
<P>Perovskite solar cell performance is critically dependent on the characteristics of the electron transporting layer (ETL) and its interface. This work demonstrates the importance of interface modification in which the charge transport kinetics is improved through band gap engineering of the interfaces in perovskite solar cells with La2O3. The surface of a mesoporous TiO2 ETL (mp-TiO2) on CH3NH3PbI3-based solar cells is modified using a simple dip-coating method involving a lanthanum salt solution. The layer thickness of La2O3 was optimized, and its effects on the conduction band position, interfacial charge recombination, and photovoltaic performance were investigated. Modifying the mp-TiO2 ETL with La2O3 resulted in a nearly 46% enhancement of the power conversion efficiency because of the energetically favourable band gap engineering, which allowed the fast transfer of photo-generated electrons from the perovskite absorber layer to the ETL. Our simple interfacial control approach uses a new efficient interface-modifying material, demonstrating that interface engineering could be a key strategy for improving the performance of perovskite solar cells.</P>
Electrochemical supercapacitors of electrodeposited PANI/H-RuO<sub>2</sub> hybrid nanostructure
Shaikh, S.F.,Lim, J.Y.,Joo, O.S. Elsevier 2013 Current Applied Physics Vol.13 No.4
Electrodeposited mixed nanostructures composed of conducting polyaniline (PANI) and hydrous ruthenium oxide (H-RuO<SUB>2</SUB>) referred as a hybrid nanostructure was synthesized. The surface morphology was investigated from the field-emission scanning electron microscopy digital photoimages. Fibrous network of PANI and spheres of H-RuO<SUB>2</SUB> were obtained. PANI embedded H-RuO<SUB>2</SUB> was confirmed from the Raman spectroscopy analysis. Cyclic-voltammetry, used to characterize the electrochemical capacitive properties of hybrid PANI/H-RuO<SUB>2</SUB> (RP 30) nanostructure, showed a specific capacitance as high as 322 F/g in 0.5 M H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. The electrochemical impedance spectroscopy measurement revealed the low equivalent series resistance.
Investigation on the Interaction of Gabapentin with Bovine Serum Albumin by Spectroscopic Techniques
Ashoka, S.,Seetharamappa, J.,Kandagal, P.B.,Shaikh, S.M.T. Korean Society of Photoscience 2005 Journal of Photosciences Vol.12 No.3
Spectroscopic investigations on the interaction of gabapentin (GBP) with bovine serum albumin (BSA) were reported. The association constant of GBP-BSA system was determined at different temperatures (298, 302, 306 and 311 K) based on the fluorescence quenching results. The GBP was found to quench the fluorescence of BSA through static mechanism. Thermodynamic parameters, the standard enthalpy change, $({\Delta}H^o)$ and the standard entropy change $({\Delta}S^o)$ were observed to be $-9.61{\pm}0.008\;kJ\;mol^{-1}$ and $3.58{\pm}0.011\;Jmol^{-1}K{-1}$ respectively. These indicated that the hydrophobic and electrostatic forces played a role in the interaction of GBP with BSA. The negative value of ${\Delta}G^o$ revealed that the binding reaction is spontaneous. The circular dichroism studies indicated the conformational changes in BSA upon interaction with GBP. The effect of some metal ions on the binding constant was also investigated.
Investigations on silver/polyaniline electrodes for electrochemical supercapacitors
Patil, Dipali S.,Shaikh, J. S.,Pawar, S. A.,Devan, R. S.,Ma, Y. R.,Moholkar, A. V.,Kim, J. H.,Kalubarme, R. S.,Park, C. J.,Patil, P. S. The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.34
<P>Polyaniline (PANI) and silver doped polyaniline (Ag/PANI) thin films were deposited on stainless steel substrates by a dip coating technique. To study the effect of doping concentration of Ag on the specific capacitance of PANI the concentration of Ag was varied from 0.3 to 1.2 weight percent. Fourier transform-infrared and Fourier transform-Raman spectroscopy, and energy dispersion X-ray techniques were used for the phase identification and determination of the doping content in the PANI films, respectively. The surface morphology of the films was examined by Field Emission Scanning Electron Microscopy, which revealed a nanofiber like structure for PANI and nanofibers with bright spots of Ag particles for the Ag/PANI films. There was decrease in the room temperature electrical resistivity of the Ag/PANI films of the order of 10<SUP>2</SUP> with increasing Ag concentration. The supercapacitive behavior of the electrodes was tested in a three electrode system using 1.0 M H<SUB>2</SUB>SO<SUB>4</SUB> electrolyte. The specific capacitance increased from 285 F g<SUP>−1</SUP> (for PANI) to 512 F g<SUP>−1</SUP> for Ag/PANI at 0.9 weight percent doping of Ag, owing to the synergic effect of PANI and silver nanoparticles. This work demonstrates a simple strategy of improving the specific capacitance of polymer electrodes and may also be easily adopted for other dopants.</P> <P>Graphic Abstract</P><P>The presence of Ag nanoparticles on PANI nanofibers provides a least resistance path to electron transportation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp41757j'> </P>
Bhat, T. S.,Mali, S. S.,Korade, S. D.,Shaikh, J. S.,Karanjkar, M. M.,Hong, C. K.,Kim, J. H.,Patil, P. S. Springer Science + Business Media 2017 Journal of materials science. Materials in electro Vol.28 No.1
<P>Anatase titanium dioxide (TiO2) microspheres were successfully synthesized via a controlled chemical route using carbon spheres as sacrificial templates. The morphology has been controlled by varying the deposition time of carbonaceous (c) spheres from 4 to 16 h with the interval of 4 h, which affect the size of TiO2 spheres. The structural, morphological, optical, compositional and photoelectrochemical properties of the TiO2 thin films were studied. X-ray diffraction (XRD) pattern confirms the formation of anatase TiO2 with the tetragonal crystal structure. Field emission scanning electron microscopy analysis revealed that the synthesized anatase TiO2 microspheres has average diameter of similar to 330-510 nm. The blueshift in optical absorption is observed due to Mie scattering. The indirect optical band gap energy of TiO2 was varied over 3.05-3.16 eV, with the increase in deposition time. The HRTEM and SAED results show the polycrystalline nature of the sample which is in good agreement with the XRD. The anatase TiO2 hollow spheres with mesoporous walls and high specific surface area i.e. 41 m(2) g(-1) was obtained using this simple method. The films were photoelectrochemically active with maximum current density 531 mu A/cm(2) under 100 mW/cm(2) illuminations.</P>
Growth of ZnO nanodisk, nanospindles and nanoflowers for gas sensor: pH dependency
RAJENDRA CHARANDEO PAWAR,J.S. Shaikh,S. S. Suryavanshi,P.S. Patil 한국물리학회 2012 Current Applied Physics Vol.12 No.3
Suitable morphology for fast electron transportation is a crucial requirement for the fabrication of gas sensor application. Highly oriented and well defined zinc oxide (ZnO) nano/micro-scale structures are grown on the glass substrates using aqueous chemical route. The grown nanostructures have been characterized by X-ray diffraction pattern (XRD), scanning electron microscope (SEM) and optical absorption techniques. The SEM micrographs revealed the formation of disk, rod, spindle and flower-like morphologies at different pH values ranging from 5 to 10. The grown nanostructures were employed for acetone gas-sensing measurement. It is observed that the sensors based on nanoflowers showed higher response (95%) for acetone gas at 325 ℃. The high acetone gas sensitivity of ZnO nanoflowers can be attributed to the surface morphology. Moreover, nanoflower-like structure exhibits the fast response and recovery.
Shaikh J. Mohiuddin,Md. Ashraful Haque,Md. Manjurul Haque,Md. Tofazzal Islam,Partha S Biswas 한국육종학회 2020 Plant Breeding and Biotechnology Vol.8 No.4
Molecular mapping and application of quantitative trait loci (QTL) associated with a higher level of grain Zinc is aviable option to enhance zinc content in rice through breeding. An F2 population derived from a cross between a high yielding variety,BRRI dhan28, and a locally adapted Zn enriched cultivar, Kalobokri was used to map QTLs associated with higher levels of Zn in ricegrain. The F2:3 progenies varied significantly (P < 0.0001) in Zinc contents with a mean value remarkably higher than those in thesuperior parent. Through marker by trait analysis using IciMapping, we detected a large-effect QTL, qGZn3 on chromosome 3 betweenRM5419 and RM1164 spanning 1.83 Mb interval at the 0.05 level of significance with a threshold LOD of 10.61. This QTL showed a21.1% (R2value) contribution to the total phenotypic variation for zinc content in the unpolished rice grains with 4.68 μg/g additiveeffect of Kalobokri alleles. We also detected 11 metal homeostasis related genes within the interval of qGZn3. In-silico analysis showedthat four expressed sequence tags of one candidate gene (LOC_Os03g22810) encoding Cu/Zn superoxide dismutase, a metal-bindingprotein, are highly active in the endosperm as well as in the embryonic tissue of rice grain. Taken together, our results suggest thatqGZn3 is a major QTL associated with high grain Zn content in the F2 progenies of rice. Our findings offer valuable genetic resourcesto facilitate breeding for high yielding and Zinc-enriched rice variety.