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Kanade, K.G.,Baeg, J.O.,Kong, K.j.,Kale, B.B.,Lee, S.M.,Moon, S.J.,Lee, C.W.,Yoon, S. Pergamon Press ; Elsevier Science Ltd 2008 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.33 No.23
We report here the novel approach to synthesis of layer perovskite photocatalysts, Pb<SUB>2</SUB>Ga<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>10</SUB> and RbPb<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>7</SUB> using solid state route (SSR) and molten salt synthesis (MSS) method. The reported modified MSS method has advantage over conventional SSR method for uniform particle size, well-defined crystal structure, controlled morphology and stoichiometry vis-a-vis photocatalysis. The structural study was performed using X-ray difractometry (XRD) and computation based on density functional theory (DFT). The simulation study showed that both the compounds belong to the Ruddlesden-Popper phase (A'<SUB>2</SUB>A<SUB>n-1</SUB>B<SUB>n</SUB>O<SUB>3n+1</SUB>; n=2 or 3). The surface morphology of the materials was studied using field emission scanning electron microscope (FESEM) and high resolution transmission electron microscope (HRTEM). The average particles size of perovskites Pb<SUB>2</SUB>Ga<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>10</SUB> and RbPb<SUB>2</SUB>Nb<SUB>2</SUB>O<SUB>7</SUB> was in the range 20-40 and 70-90nm respectively. The efficacy of these materials was studied to particle size and morphology as a visible light driven photocatalyst for the hydrogen generation from H<SUB>2</SUB>S. Electronic band structure with DOS has also been performed for both the materials. Being a stable single-phase ternary-layered oxide perovskites and band gap (2.75eV) in visible domain, they may have potential applications in electronic devices as well.
Kanade, K.G.,Baeg, J.-O.,Kale, B.B.,Mi Lee, S.,Moon, S.J.,Kong, K.j. Pergamon Press ; Elsevier Science Ltd 2007 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.32 No.18
Rose-red color Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17-x</SUB>N<SUB>x</SUB> oxynitride photocatalyst was synthesized by thermal ammonolysis of Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17</SUB> at 1073K. TEM image of Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17-x</SUB>N<SUB>x</SUB> sample showed prismatic pseudo orthorhombic shaped particles with clear edges and an average particle size in the range of 80-90nm. The photocatalytic activities of the oxynitride samples were studied for hydrogen production by H<SUB>2</SUB>S splitting under visible light irradiation. The oxynitride Nb<SUB>2</SUB>Zr<SUB>6</SUB>O<SUB>17-x</SUB>N<SUB>x</SUB> gave the quantum yield of 13.5% in the production of hydrogen from decomposition of hydrogen sulfide under visible light irradiation.
Copper nano-sol loaded woven fabrics: structure and color characterization
Pragnya Kanade,Bharat Patel 한국의류학회 2017 Fashion and Textiles Vol.4 No.1
Nano technology is an upcoming branch where lot of research work is being done with the intention of improving/changing properties of the materials. In this study polyester, cotton and polyester-cotton blended fabrics were coated with copper nano particles by pad-dry-cure technique. The morphology of nano-composite fabrics characterized using scanning electron microscope reveals that nanoparticles were dispersed on the fabric samples. The elemental analysis for confirming the presence of copper in the fabric samples was done using the Fourier transform infrared spectroscopy and energy dispersive X-ray spectroscopy techniques. The X-ray diffraction analysis of the fabric samples helped to unveil that incorporation of copper nano particles increased the d-spacing value in polyester fabric to a greater extent in comparison to the cotton and polyester-cotton blended fabrics. The nano treated woven fabric samples were dyed using myrobolan; a natural dye. The samples were evaluated in terms of colourimetric parameters and colour fastness. The copper nano-sol treatment was found to improve both K/S and colour fastness.