https://ir.vidyasagar.ac.in/jspui/handle/123456789/1778 Tue, 17 Feb 2026 07:31:31 GMT 2026-02-17T07:31:31Z https://ir.vidyasagar.ac.in/jspui/handle/123456789/1796 Title: Synthesis, Characterization and Photocataytic Activity of SnS Nanocrystals Authors: Rana, Chandan; Saha, Satyajit Abstract: Tin sulfide nanocrystals were successfully synthesized by wet chemical precipitation method. The as prepared SnS nanocrystals are characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), field emission scinning electron microscopy (FESEM), UV-VIS and photo lumiscence (PL) study. XRD results show that the phases of obtained nanoparticles areorthorhombic. TEM image shows that the particles are almost spherical shape and the grain size is about 23 nm. UV-VIS absorption spectroscopy study determines the band gap energy of SnS is approximately 2.39 eV. Room temperature PL spectra of as prepared SnS show an emission peak at 630.34 nm (1.96 eV) which is due to various defect level transition. It is clear that as obtained SnS shows a strong photocatalytic activity for the degradation of methyl blue (MB) in visible light radiation. This outstanding photocatalytic performance of SnS is mainly due to smallercrystal size, greater surface area and good absorption coefficient in the range of visible light spectrum. Mon, 25 Dec 2017 00:00:00 GMT https://ir.vidyasagar.ac.in/jspui/handle/123456789/1796 2017-12-25T00:00:00Z https://ir.vidyasagar.ac.in/jspui/handle/123456789/1795 Title: Squeezing and Antibunching in Three-mode Atom-Molecule Bose-Einstein Condensates Authors: Mukhopadhyay, Arjun; Giri, Sandip Kumar; Sinha, Tuhina; Jana, Paresh Chandra Abstract: We report the presence of the nonclassical properties namely squeezing and antibunching in three mode Bose-Einstein Condensate (BEC) system where the atomic mode is coupled with two molecular modes. Here photo associative stimulated Raman adiabatic passage (STIRAP) prepares the molecular modes in conjugation with Bose stimulation. Both squeezing and antibunching are found for atomic mode whereas the molecular modes remain coherent. The coupled mode squeezing is observed if one of the mode is necessarily atomicandthe coupled mode antibunching is present only for atomic-excited molecular mode. No nonclassicalities are found in excited molecular-stable molecular mode. The model Hamiltonian is solved analytically by a well-established approximation technique and the solutions are plotted with rescaled time. These solutions are well supported by numerical simulations. The criteria used here to examine nonclassicalities are practically realizable. Mon, 25 Dec 2017 00:00:00 GMT https://ir.vidyasagar.ac.in/jspui/handle/123456789/1795 2017-12-25T00:00:00Z https://ir.vidyasagar.ac.in/jspui/handle/123456789/1794 Title: Transition from CdSe Nanoparticles to CdSe nanorods with Growth Time Authors: Manna, A.; Bhattacharya, R.; Saha, S.; Saha, S. C. Abstract: A simple chemical reduction route is followed to grow the CdSe nano structured materials at room temperature (30 0C). The growth time is kept 3 hours, 8 hours and 12 hours respectively to synthesize the material. The samples are characterized structurally, optically. The surface morphology of the samples are also studied. The result supports the formation of nanoparticle at 3 hours growth time. With the increase of growth time the nanoparticle structure changes to nanorod and is very prominent at 12 hours growth time. An increase in bandgap is also observed for the sample at higher growth times. Mon, 25 Dec 2017 00:00:00 GMT https://ir.vidyasagar.ac.in/jspui/handle/123456789/1794 2017-12-25T00:00:00Z https://ir.vidyasagar.ac.in/jspui/handle/123456789/1793 Title: Structural and Magnetic Study of Zr4+ Substituted Magnesium Ferrite Nano-particles Authors: Sarkar, N. N.; Rewatkar, K. G.; Nanoti, V.M; Tayade, N.T; Bhowmick, D. S Abstract: Nano-sized Zr-Al doped magnesium ferrites with nominal composition, Mg (1+x)Zrx (FeAl)1-xO4 (x = 0.2, 0.4, 0.6, 0.8) were synthesized using sol-gel auto combustion. The structural study of the synthesized iron oxide samples werecarried out by X-ray diffraction (XRD). The XRD analysis confirmed face centered cubic structure forall the compositions of Mg(1+x)Zrx(FeAl)1-xO4nanocrystallites. The variation in lattice parameter as determined by XRD data agreed with variation of ionic radii of host cations Zr4+ and Al3+. Characterized spinel nano-ferrites were evaluated for their potential applications by magnetic hysteresis loops. Value of saturation magnetization (Ms) goes on increased up to x = 0.8 with fluctuations in between x = 0.2 to x = 0.8. The values of Ms of some compositions predicted the potential applications in field of hyperthermia, recording media and microwave devices. Mon, 25 Dec 2017 00:00:00 GMT https://ir.vidyasagar.ac.in/jspui/handle/123456789/1793 2017-12-25T00:00:00Z