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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.
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.
Sun, Hao,Mali, Sachitanand M.,Singh, Sumeet K.,Meledin, Roman,Brik, Ashraf,Kwon, Yong Tae,Kravtsova-Ivantsiv, Yelena,Bercovich, Beatrice,Ciechanover, Aaron National Academy of Sciences 2019 Proceedings of the National Academy of Sciences Vol.116 No.16
<P><B>Significance</B></P><P>The canonical targeting signal for degrading proteins by the ubiquitin (Ub) system—a chain composed of multiple Ub moieties—has remained a mystery. The structure of the proteasome, the enzyme that recognizes the signal and degrades the target substrate cannot explain why such a long chain is needed. To better understand this problem, we synthesized α-globin to which chains with different number of Ubs were attached. In long adducts, the proximal Ub remains on the substrate, likely securing its attachment to the proteasome, and is degraded with it. The distal Ub protects the proximal from removal by deubiquitinating enzymes and is then removed and recycled. In short adducts, the Ub moieties are rapidly removed, and the substrate remains stable.</P><P>One of the enigmas in the ubiquitin (Ub) field is the requirement for a poly-Ub chain as a proteasomal targeting signal. The canonical chain appears to be longer than the distance between the two Ub-binding proteasomal receptors. Furthermore, genetic manipulation has shown that one receptor subunit is sufficient, which suggests that a single Ub can serve as a degradation signal. To shed light on this mystery, we chemically synthesized tetra-Ub, di-Ub (K<SUP>48</SUP>-based), and mono-Ub adducts of HA-α-globin, where the distal or proximal Ub moieties were tagged differentially with either Myc or Flag. When incubated in a crude cell extract, the distal Ub moiety in the tetra-Ub adduct was mostly removed by deubiquitinating enzymes (DUBs) and reconjugated to other substrates in the extract. In contrast, the proximal moiety was most likely degraded with the substrate. The efficacy of degradation was proportionate to the chain length; while tetra-Ub globin was an efficient substrate, with mono-Ub globin, we observed rapid removal of the Ub moiety with almost no degradation of the free globin. Taken together, these findings suggest that the proximal moieties are necessary for securing the association of the substrate with the proteasome along the proteolytic process, whereas the distal moieties are important in protecting the proximal moieties from premature deubiquitination. Interestingly, when the same experiment was carried out using purified 26S proteasome, mono- and tetra-Ub globin were similarly degraded, highlighting the roles of the entire repertoire of cellular DUBs in regulating the degradation of proteasomal substrates.</P>
Effect of annealing on the physical properties of thermally evaporated In2S3 thin films
S. Rasool,K. Saritha,K.T. Ramakrishna Reddy,M.S. Tivanov,A.V. Trofimova,S.E. Tikoto,L. Bychto,A. Patryn,M. Maliński,V.F. Gremenok 한국물리학회 2019 Current Applied Physics Vol.19 No.2
The structural, compositional, morphological and optical properties of In2S3 thin films, prepared by thermal evaporation technique and annealed in sulfur ambient at different temperatures have been investigated. The grazing incident X-ray diffraction patterns have indicated polycrystalline form and predominantly cubic structure of annealed In2S3 films. The scanning electron microscopy revealed textured surface with uniformly distributed grains and the grain size increased with increase of annealing temperature. The optical parameters of the films have been determined using conventional transmission and reflection spectra as well as from surface photovoltage measurements.
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>
Mali, S.S.,Shim, C.S.,Kim, H.,Hong, C.K. Ceramurgica ; Elsevier Science Ltd 2016 CERAMICS INTERNATIONAL Vol.42 No.1
In this article, single step synthesized few micrometer vertically aligned 1D rutile TiO<SUB>2</SUB> nanorods (TNR) were deposited directly onto FTO substrate by controlled hydrothermal route. Simple and cost-effective non-aqueous successive a ionic layer adsorption and reaction (SILAR) technique was adopted for the synthesis of cadmium sulfide (CdS) quantum dots (QDs) sensitization onto TNR. These CdS-TNR samples were further used for their quantum dot sensitization (QDSSC) performance in 0.5M Na<SUB>2</SUB>S electrolyte. The CdS-TNR photoelectrode deposited at 40 SILAR cycles exhibits a photovoltaic performance with an open-circuit photovoltage (V<SUB>OC</SUB>) (0.606V) and short-circuit photocurrent (J<SUB>SC</SUB>) (6.19mA/cm<SUP>2</SUP>). The highest power conversion efficiency of QDSCs is 1.87% has been achieved at relatively low nanorod length. Further, the transient and interface resistance properties were studied by open circuit voltage decay (OCVD) and electrochemical impedance spectroscopy (EIS) measurements.
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
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>
Kondalkar, Vijay V.,Mali, Sawanta S.,Kharade, Rohini R.,Khot, Kishorkumar V.,Patil, Pallavi B.,Mane, Rahul M.,Choudhury, Sipra,Patil, Pramod S.,Hong, Chang K.,Kim, Jin H.,Bhosale, Popatrao N. The Royal Society of Chemistry 2015 Dalton Transactions Vol.44 No.6
<P>Herein, we report honeycomb nanostructured single crystalline hexagonal WO<SUB>3</SUB> (h-WO<SUB>3</SUB>) thin films in order to improve electrochromic performance. In the present investigation, honeycomb nanostructured WO<SUB>3</SUB> with different unit size and nanowire array with highly nanocrystalline frameworks have been synthesized <I>via</I> a hydrothermal technique. The influence of hydrothermal reaction time on the honeycomb unit cells, crystallite size, lithium ion diffusion coefficient and switching time for coloration/bleaching were studied systematically. The electrochromic study reveals that the honeycomb unit cell size has a significant impact on the electrochromic performance. Small unit cells in the honeycomb lead to large optical modulation and fast switching response. A large optical modulation in the visible spectral region (60.74% at <I>λ</I> = 630 nm) at a potential of −1.2 V with fast switching time (4.29 s for coloration and 3.38 s for bleaching) and high coloration efficiency (87.23 cm<SUP>2</SUP> C<SUP>−1</SUP>) is observed in the honeycomb WO<SUB>3</SUB> thin films with a unit cell diameter of 1.7 μm. The variation in color on reduction of WO<SUB>3</SUB> with applied potential has been plotted on an <I>xy</I>-chromaticity diagram and the color space coordinate shows the transition from a colorless to deep blue state.</P> <P>Graphic Abstract</P><P>Honeycomb nanostructured single crystalline hexagonal WO<SUB>3</SUB> (h-WO<SUB>3</SUB>) thin films in order to improve electrochromic performance. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4dt02953d'> </P>