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Rengasamy Gopalakrishnan: Influence Statistics

Electrochromic thin films of tungsten oxide (WO3) were prepared on transparent conducting oxide substrates, i.e., fluorine doped tin oxide coated (FTO or SnO2:F) glass and microscopic glass substrates by the electron beam evaporation technique using pure WO3 (99.99%) pellets at various substrate temperatures (i.e., Tsub = room temperature (RT, 30 °C), 100 °C and 200 °C). The films were prepared under vacuum of the order of 1 × 10−5 mbar. The room temperature prepared films were further ...

Nowadays more attention has been paid to the growth of organic nonlinear optical single crystals due to their high nonlinear optical efficiency and fairly good optical damage threshold comparable to that of inorganic counterparts. The organic nonlinear optical single crystals of benzimidazole (BMZ) grown by the slow evaporation solution growth technique (SEST) and the vertical Bridgman technique (VBT) were characterized, and their results have been compared. Characterization has been ...

Electrochromic molybdenum oxide (MoO3) thin films were prepared by electron beam evaporation technique using the dry MoO3 pellets. The films were deposited on glass and fluorine doped tin oxide (SnO2:F or FTO) coated glass substrates at different substrate temperatures like room temperature (RT, 30°C), 100°C and 200°C. The influence of substrate temperature on the structural, surface morphological and optical properties of the films has been studied. The X-ray diffraction analysis showed ...

Development of green route for the synthesis of nanoparticles with plant extracts plays a very important role in nanotechnology without any toxicity chemicals. Herein we report a new approach to synthesize silver nanoparticles (AgNPs) using aqueous extract of Alpinia calcarata root as a reducing as well as stabilizing agent. The crystal structure and purity of the synthesized AgNPs were studied using Powder X-ray Diffraction analysis. The Surface Plasmon Resonance bands of synthesized ...

Cu doped ZnO (Zn1−xCuxO, x=0, 0.02, 0.04 and 0.06) nanopowders have been synthesized by co-precipitation method and annealed at 500°C for 2h under Ar atmosphere. The synthesized samples have been characterized by powder X-ray diffraction, energy-dispersive analysis X-ray (EDAX) spectra, UV–Visible spectrophotometer and Fourier transform infrared (FTIR) spectroscopy. The XRD measurement reveals that the prepared nanoparticles have different microstructure without changing a hexagonal ...

The synthesis, growth and structure of a novel organic third order nonlinear optical (NLO) crystal namely,

N

,

N

,

N

′,

N

′-tetramethylethylenediammonium-bis(4-nitrophenolate) (TMEDA4NP) is presented.

The synthesis, growth and structure of a novel organic third order ...

Mechanosynthesis of nanocrystalline powders of CZTS and CZTSe by ball milling technique and the physical properties of thermally evaporated CZTS and CZTSe thin films as a function of substrate temperature are investigated. Nanocrystalline Cu–Zn–Tin–Sulphide (CZTS) and Cu–Zn–Tin–Selenide (CZTSe) powders synthesized by ball milling at different milling time using the source materials of Cu, Zn, Sn, S (or) Se in the ratio 2:1:1:4 are investigated. The above synthesized powder was thermally ...

Bulk single crystals of pure and metal ions (Mn(2+), Cu(2+) and Ni(2+)) doped sulphamic acid (SA) have been grown by conventional and unidirectional solution growth methods. Intensities of powder X-ray diffraction peaks of metal ions doped SA reveal that these dopants enhanced the crystallanity. The peak broadening and intensity variation in some frequency regions in FT-IR spectra show the incorporation of dopants in the SA lattice. Mn(2+) and Cu(2+) doped SA single crystals show high ...

Chalcone based materials are widely used in many industrial applications. The two new similar chalcone based single crystals, namely (E)-3-(4-(benzyloxy)phenyl)-1-(4-hydroxyphenyl)prop-2-en-1-one (Crystal A) and (E)-1-(4-(benzyloxy)phenyl)-3-(4-hydroxyphenyl)prop-2-en-1-one (Crystal B) were synthesized and grown as single crystals by slow evaporation solution growth technique in acetone. The structures of the grown crystals were solved and refined by single crystal XRD and this ...

Single crystals of α- and γ-glycine were grown by the slow evaporation solution growth method using deionised water as solvent. The α-glycine was transformed to γ-glycine by addition of KNO3 as additive and both the forms of glycine single crystals were grown and the characteristic properties were studied and compared. From the single crystal XRD analysis the grown α- and γ-glycine crystals are confirmed. The presence of the functional groups of α- and γ-glycine was analyzed from the ...

CdSe thin films were deposited on the glass substrates by chemical bath deposition method at 80°C using cadmium acetate and sodium selenosulphate as source materials and ethylene diamine tetra acetic acid (EDTA) as a chelating agent with concentrations 0.025, 0.075 and 0.1M. The various preparative parameters such as composition, solution temperature, pH of the solution and deposition time were optimized for depositing good quality CdSe films. The deposited CdSe thin films are annealed ...

In this work, we have successfully synthesized highly biocompatible and functionalized Dioscorea alata (D. alata) mediated silver nanoparticles with different quantities of its extract for the evaluation of proficient bactericidal activity and optical limiting behavior. The crystalline nature of the synthesized silver nanoparticles was confirmed by powder X-ray powder diffraction (XRD) analysis and furthermore confirmed from SAED pattern of HRTEM Analysis. The Surface Plasmon Resonance ...

In this paper, we report the substrate temperature induced changes in physical properties of thermal evaporated lead selenide (PbSe) thin films from the chemically synthesized nanocrystalline PbSe powders. As the first step, nanocrystalline lead selenide was synthesized by simple chemical method at 80°C using lead nitrate [Pb(NO3)2] and sodium selenosulphate [Na2SeSO3] in the aqueous alkaline media. Ethylene Diamine Tetra acetic acid (0.1M) was used as a complexing agent to form stable ...

A new semiorganic material of l-alanine sodium nitrate (LASN) has been synthesized and successfully grown by the slow evaporation solution growth method. The grown crystals have been subjected to various characterization techniques such as single crystal X-ray diffraction studies, FT-IR and laser Raman analyses to determine the crystal structure and functional groups, respectively. Crystalline perfection of the grown crystal was analyzed by the high resolution X-ray diffraction technique ...

Nanocrystalline compound semiconductor Cadmium Selenide was synthesized by the solvothermal method using Cd(NO3)2.4H2O and Se metal granules. The synthesized nanocrystalline CdSe particles were subjected to vacuum annealing at 450°C to maintain the hexagonal phase. The as synthesized and annealed powders were analyzed using XRD, SEM, EDX and DTA. The X-ray diffraction pattern of the as synthesized powder shows cubic phase, whereas the 450°C annealed CdSe powder exhibits hexagonal phase. ...