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- 저자 : Mondal Anup (검색결과 4 건)
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Mondal, Gopinath,Bera, Pradip,Santra, Ananyakumari,Jana, Sumanta,Mandal, Tarak Nath,Mondal, Anup,Seok, Sang Il,Bera, Pulakesh The Royal Society of Chemistry 2014 NEW JOURNAL OF CHEMISTRY Vol.38 No.10
<P>The reaction of CuCl<SUB>2</SUB>·2H<SUB>2</SUB>O with the methyl ester of 3,5-dimethyl pyrazole-1-dithioic acid (mdpa) yields a blackish brown complex of composition, [Cu(mdpa)<SUB>2</SUB>][CuCl<SUB>2</SUB>]. The complex formed a well-defined crystal and is characterized by single-crystal X-ray diffraction, thermogravimetry (TG), and spectroscopic studies. The molecule possesses a distorted tetrahedral configuration with a CuN<SUB>2</SUB>S<SUB>2</SUB> chromophore with +1 oxidation state of copper. The TG study reveals that the molecule is a suitable precursor for copper sulfide nanoparticles. The low temperature thermal decomposition of the single-source precursor produces hexagonal chalcocite (Cu<SUB>2</SUB>S) nanostructures in ethylene diamine and ethylene glycol. A selective synthesis of copper-rich high chalcocite was obtained using the new precursor. The size and morphology of the synthesized Cu<SUB>2</SUB>S nanoparticles are guided by the precursor and likely to be less dependent on the solvent used in the experiment. The nanoparticles were characterized by X-ray diffraction, scanning electronic microscope, and UV-Vis spectroscopic studies. The optical band gap of the as-synthesized Cu<SUB>2</SUB>S nanoparticles is measured to be 1.80–2.40 eV. The Cu<SUB>2</SUB>S nanoparticles are found to be good catalysts in UV photo catalytic decomposition (90%) of Congo red (CR) dye following first-order reaction kinetics, and the reusability study of the Cu<SUB>2</SUB>S catalyst also shows excellent catalytic performance (80%).</P> <P>Graphic Abstract</P><P>A new single-source precursor, [Cu(mdpa)<SUB>2</SUB>][CuCl<SUB>2</SUB>], is used to prepare selectively high chalcocite (Cu<SUB>2</SUB>S) with excellent photodegradation of Congo red (CR). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4nj00584h'> </P>
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Ritabrata Banerjee,Somoday Hazra,Anup Kumar Ghosh,Amal Chandra Mondal 대한신경정신의학회 2014 PSYCHIATRY INVESTIGATION Vol.11 No.3
Objective-The present study aimed to investigate whether graded doses of Bacopa Monniera (BM) extract could produce antidepressant-like effects in chronic unpredictable stress (CUS) induced depression in rats and its possible mechanism(s). Methods-Rats were subjected to an experimental setting of CUS. The effect of BM extract treatment in CUS-induced depression was examined using behavioral tests including the sucrose consumption, open field test and shuttle box escape test. The mechanism underlying the antidepressant-like action of BM extract was examined by measuring brain-derived neurotrophic factor (BDNF) protein and mRNA expression in brain tissues of CUS-exposed rats. Results-Exposure to CUS for 4 weeks caused depression-like behavior in rats, as indicated by significant decreases in sucrose consumption, locomotor activity and escape latency. In addition, it was found that BDNF protein and mRNA levels in the hippocampus and frontal cortex were lower in CUS-treated rats, as compared to controls. Daily administration of the graded doses of BM extract during the 4-week period of CUS significantly suppressed behavioral changes and attenuated the CUS-induced decrease in BDNF protein and mRNA levels in the hippocampus and frontal cortex. Conclusion-The results suggest that BM extract alleviates depression induced by CUS. Present study also confirms that 80–120 mg/kg doses of BM extract have significantly higher antidepressant-like activity.
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Pinaki Mandal,Uday Kumar Ghorui,Anup Mondal,Dipali Banerjee 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.4
A comparative study of visible light-driven photoelectrochemical (PEC) cell was performed for tin selenide (SnSe), synthesizedby two different methods viz. solvothermal and electrodeposition. The SnSe films were characterized by XRD,EDS and SEM for structural, chemical, and morphological analysis, respectively. Optical characteristics were studied byUV–Vis-NIR and photoluminescence (PL) spectroscopy. PL emission spectra reveal strong blue emission band around at435 nm, which emphasize their potential application in optoelectronic devices. Photosensitivity and stability tests werecarried out by chronoamperometric measurement. Mott–Schottky plots were employed to obtain the flat band potentials,which were further used for an explanation of their performances in PEC cells. An enhanced photocurrent was observed forsolvothermally prepared SnSe (ST-SnSe) in comparison to electrochemically deposited SnSe (ED-SnSe) film. Efficiencies(η) of 0.62% and 1.25% were observed for ED-SnSe and ST-SnSe, respectively. Electropotential energy band diagrams ofFTO/SnSe/electrolyte junction have been presented to explain the obtained results.
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C60 embedded diamond-like nanocomposite thin film
Jana Sukhendu,Das Sayan,De Debasish,Shakti Nanda,Mondal Anup,Bhattacharya Sekhar,Gongopadhyay Utpal 한국탄소학회 2022 Carbon Letters Vol.32 No.1
Diamond-like nanocomposite (DLN) has become a promising thin film for many fields of applications due to its unique and tunable properties. However, low optical bandgap and thermal stability limits its application in many fields particularly as antireflection coating on solar cell. In the present study, the DLN thin film has been deposited using a mixed liquid precursor by rf-PECVD process. Surprisingly the presence of nc-C60 in FCC structure in DLN matrix has been observed. The degree of crystallinity and diameter of C60 have been increased significantly after annealed at 850 °C. The film has been annealed at 850 °C to primarily investigate its feasibility as antireflection coating (ARC) in compatible with industrial solar cell fabrication process. The refractive index and optical bandgap of the film were around 1.80 and 4.10 eV, respectively. Moreover, the optical bandgap has decreased to some extent to 3.92 eV even after annealing at such high temperature. The high SiOx at% and embedded nc-C60 enhanced the optical transparency and thermal stability of the DLN film. The solar-weighted average reflection of DLN-coated textured silicon was reduced significantly to 1.91%. The C60 embedded DLN film has a great potential to apply in different optoelectronic devices especially in solar cell as ARC.
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