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Khot, Kishorkumar V.,Mali, Sawanta S.,Pawar, Nita B.,Kharade, Rohini R.,Mane, Rahul M.,Kondalkar, Vijay V.,Patil, Pallavi B.,Patil, Pramod S.,Hong, Chang K.,Kim, Jin H.,Heo, Jaeyeong,Bhosale, Popatrao The Royal Society of Chemistry 2014 New journal of chemistry Vol.38 No.12
<P>Nanocrystalline cadmium sulfoselenide thin films have been synthesized using a self-organized arrested precipitation technique with different deposition times using triethanolamine as a complexing agent. Optical, structural, morphological and photoelectrochemical solar cell properties were investigated as a function of deposition time. A UV-Vis-NIR absorption study suggested a direct allowed transition type and the band gap energy decreased from 2.01 to 1.86 eV with the increase in deposition time. X-ray diffraction studies revealed that the thin films are nanocrystalline by nature with a pure hexagonal crystal structure and a calculated crystallite size of 51–68 nm. Field emission scanning electron microscopy demonstrated that the surface morphology was altered from nanoflakes to assorted nanoflakes–nanospheres and finally to a nanocoral-like morphology. X-ray photoelectron spectroscopy and energy dispersive X-ray spectroscopy showed that the composition of the Cd(SSe) thin films was of good stoichiometry. Electrical conductivity and thermoelectric power measurements confirmed that the deposited films were n-type semiconductors. From <I>J–V</I> measurements, a highest photo-conversion efficiency of 0.57% was achieved. The significant boost in the PEC performance might be due to the improved crystallinity along with lower values of the grain boundary resistance, dislocation density and the microstrain of the Cd(SSe) thin films.</P> <P>Graphic Abstract</P><P>First-time synthesis of nanoflakes to nanocoral-like Cd(SSe) thin films using a novel arrested precipitation technique with triethanolamine as complexing agent (<I>η</I> = 0.57%). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj01319k'> </P>
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
Novel-approach for fabrication of CdS thin films for photoelectrochemical solar cell application
Khot, Kishorkumar V.,Mali, Sawanta S.,Kharade, Rohini R.,Mane, Rahul M.,Patil, Pramod S.,Hong, Chang Kook,Kim, Jin Hyeok,Heo, Jaeyeong,Bhosale, Popatrao N. Springer-Verlag 2014 Journal of materials science. Materials in electro Vol.25 No.12
( Mahesh Khot ),( Rohini Gupta ),( Kadambari Barve ),( Smita Zinjarde ),( Sanjay Govindwar ),( Ameeta Ravikumar ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.4
This study evaluated the microbial conversion of coconut oil waste, a major agro-residue in tropical countries, into single cell oil (SCO) feedstock for biodiesel production. Copra cake was used as a low-cost renewable substrate without any prior chemical or enzymatic pretreatment for submerged growth of an oleaginous tropical mangrove fungus, Aspergillus terreus IBB M1. The SCO extracted from fermented biomass was converted into fatty acid methyl esters (FAMEs) by transesterification and evaluated on the basis of fatty acid profiles and key fuel properties for biodiesel. The fungus produced a biomass (8.2 g/l) yielding 257 mg/g copra cake SCO with ~98% FAMEs. The FAMEs were mainly composed of saturated methyl esters (61.2%) of medium-chain fatty acids (C12-C18) with methyl oleate (C18:1; 16.57%) and methyl linoleate (C18:2; 19.97%) making up the unsaturated content. A higher content of both saturated FAMEs and methyl oleate along with the absence of polyunsaturated FAMEs with ≥4 double bonds is expected to impart good fuel quality. This was evident from the predicted and experimentally determined key fuel properties of FAMEs (density, kinematic viscosity, iodine value, acid number, cetane number), which were in accordance with the international (ASTM D6751, EN 14214) and national (IS 15607) biodiesel standards, suggesting their suitability as a biodiesel fuel. The low cost, renewable nature, and easy availability of copra cake, its conversion into SCO without any thermochemical pretreatment, and pelleted fungal growth facilitating easier downstream processing by simple filtration make this process cost effective and environmentally favorable.
Chemical synthesis and photoelectrochemical study of CdS/rGO nanocomposite films
Nikam Ranjit P.,Lokhande Abhishekh C.,Khot Sambhaji D.,Mane Vikas J.,Lokhande Chandrakant D. 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2
The cadmium sulfide/reduced graphene oxide (CdS/rGO) composite thin films were synthesized on stainless steel (SS) substrates using the successive ionic layer adsorption and reaction (SILAR) method. The physico-chemical properties of CdS/rGO films were studied. The X-ray diffraction (XRD) revealed the growth of nanocrystalline CdS/rGO films with a cubic crystal structure. The field-emission scanning electron microscopy (FE-SEM) images of CdS/rGO-80 composite thin films showed compact spherical nanoparticles and an optical band gap found to be 2.27 eV. The CdS/rGO-80 composite thin film displayed hydrophilic nature with a water contact angle of 33°. The photoelectrochemical (PEC) studies of CdS/rGO thin film in dark and under light exhibited n-type of electrical conductivity with an improved photoactivity over bare CdS in 1 M polysulfide (NaOH + Na2S + S) electrolyte. It is observed that rGO composited CdS thin film enhances the conversion efficiency (η) from 0.09 to 0.31% than bare CdS films. The electrical transport properties were investigated by electrochemical impedance spectroscopy (EIS) study in dark and under illumination conditions and corresponding equivalent circuit of the impedance model is developed.
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>
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>
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>