The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform
Tarun Gupta - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of nanocrystalline Cobalt oxide via sol-gel coating
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2007Co-Authors: Ahalapitiya H. Jayatissa, Ambalangodage C. Jayasuriya, Tarun GuptaAbstract:Abstract Nanocrystalline Cobalt oxide thin films were fabricated by sol–gel processing method. The effect of Cobalt Salt amount in sol–gel mixture on film properties was investigated by means of Raman spectroscopy and atomic force microscopy. Micropatterns of these sol–gel mixtures were fabricated by spin coating followed by a lift-off method. It is generally known that sol–gel processed films are difficult to etch or remove by chemical and plasma techniques. In this novel process, Cobalt oxide microstructures could be fabricated by transformation of pre-fabricated nanocrystalline Cobalt oxide particles in a sol–gel process. Also, the growth of carbon nanotubes on fabricated Cobalt oxide films was investigated. It was found that different size multiwall carbon nanotubes could be grown on the Cobalt oxide films depending on the concentration of Cobalt Salt in sol–gel mixtures.
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Fabrication of nanocrystalline Cobalt oxide via sol–gel coating
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2007Co-Authors: Ahalapitiya H. Jayatissa, Ambalangodage C. Jayasuriya, Kun Guo, Tarun GuptaAbstract:Abstract Nanocrystalline Cobalt oxide thin films were fabricated by sol–gel processing method. The effect of Cobalt Salt amount in sol–gel mixture on film properties was investigated by means of Raman spectroscopy and atomic force microscopy. Micropatterns of these sol–gel mixtures were fabricated by spin coating followed by a lift-off method. It is generally known that sol–gel processed films are difficult to etch or remove by chemical and plasma techniques. In this novel process, Cobalt oxide microstructures could be fabricated by transformation of pre-fabricated nanocrystalline Cobalt oxide particles in a sol–gel process. Also, the growth of carbon nanotubes on fabricated Cobalt oxide films was investigated. It was found that different size multiwall carbon nanotubes could be grown on the Cobalt oxide films depending on the concentration of Cobalt Salt in sol–gel mixtures.
Noritaka Mizuno - One of the best experts on this subject based on the ideXlab platform.
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Synthesis, Structure Characterization, and Reversible Transformation of a Cobalt Salt of a Dilacunary γ-Keggin Silicotungstate and Sandwich-Type Di- and TetraCobalt-Containing Silicotungstate Dimers.
ChemInform, 2013Co-Authors: Yuji Kikukawa, Kosuke Suzuki, Kazuya Yamaguchi, Noritaka MizunoAbstract:A new Cobalt Salt of a dilacunary γ-Keggin silicotungstate (III) is prepared and utilized as a precursor for novel di- and tetraCobalt-containing silicotungstate dimers (V) and (VI).
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Synthesis, Structure Characterization, and Reversible Transformation of a Cobalt Salt of a Dilacunary γ-Keggin Silicotungstate and Sandwich-Type Di- and TetraCobalt-Containing Silicotungstate Dimers
Inorganic chemistry, 2013Co-Authors: Yuji Kikukawa, Kosuke Suzuki, Kazuya Yamaguchi, Noritaka MizunoAbstract:A Cobalt Salt of a γ-Keggin dilacunary silicotungstate, {CoL5}2[γ-SiW10O34L2] [Co-SiW10; L = N,N-dimethylformamide (DMF) or H2O], could be synthesized by the cation-exchange reaction of TBA4[γ-H4SiW10O36] (TBA = tetra-n-butylammonium) with 2 equiv of Co(NO3)2 with respect to TBA4[γ-H4SiW10O36] in a mixed solvent of DMF and acetone (97% yield). Each Co-SiW10 was linked by water molecules via a hydrogen-bonding network. Besides Co-SiW10, various kinds of isostructural M-SiW10 could be synthesized via the same procedure as that for Co-SiW10 (M = Mn(2+), Fe(2+), Ni(2+), Cu(2+), Zn(2+), and Cd(2+)). By the reaction of Co-SiW10 with 1 equiv of TBA6[γ-H2SiW10O36] in acetone, a silicotungstate dimer pillared by two Cobalt cations with a significantly slipped dimer configuration, TBA6[Co2(γ-H3SiW10O36)2]·3H2O (Co2), could be synthesized. By the reaction of Co-SiW10 with 3 equiv of TBAOH in acetone, a tetraCobalt-containing sandwich-type silicotungstate, TBA6[{Co(H2O)}2(μ3-OH)2{Co(H2O)2}2(γ-H2SiW10O36)2]·5H2O (Co4), could be synthesized. Compound Co4 possessed the tetraCobalt-oxygen core, [{Co(H2O)}2(μ3-OH)2{Co(H2O)2}2](6+), identical with those of previously reported Weakley-type sandwich polyoxometalates, [Co4(H2O)2(XM9O34)2](n-) (X = P(5+), Si(4+), Ge(4+), As(5+) or V(5+); M = Mo(6+) or W(6+)). The reversible transformation between these three compounds (Co-SiW10 ⇆ Co2, Co-SiW10 ⇆ Co4, and Co2 ⇆ Co4) took place by the addition and/or subtraction of required components in appropriate solvents, affording the desired products in high yields (71-93% yields).
Ahalapitiya H. Jayatissa - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of nanocrystalline Cobalt oxide via sol-gel coating
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2007Co-Authors: Ahalapitiya H. Jayatissa, Ambalangodage C. Jayasuriya, Tarun GuptaAbstract:Abstract Nanocrystalline Cobalt oxide thin films were fabricated by sol–gel processing method. The effect of Cobalt Salt amount in sol–gel mixture on film properties was investigated by means of Raman spectroscopy and atomic force microscopy. Micropatterns of these sol–gel mixtures were fabricated by spin coating followed by a lift-off method. It is generally known that sol–gel processed films are difficult to etch or remove by chemical and plasma techniques. In this novel process, Cobalt oxide microstructures could be fabricated by transformation of pre-fabricated nanocrystalline Cobalt oxide particles in a sol–gel process. Also, the growth of carbon nanotubes on fabricated Cobalt oxide films was investigated. It was found that different size multiwall carbon nanotubes could be grown on the Cobalt oxide films depending on the concentration of Cobalt Salt in sol–gel mixtures.
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Fabrication of nanocrystalline Cobalt oxide via sol–gel coating
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2007Co-Authors: Ahalapitiya H. Jayatissa, Ambalangodage C. Jayasuriya, Kun Guo, Tarun GuptaAbstract:Abstract Nanocrystalline Cobalt oxide thin films were fabricated by sol–gel processing method. The effect of Cobalt Salt amount in sol–gel mixture on film properties was investigated by means of Raman spectroscopy and atomic force microscopy. Micropatterns of these sol–gel mixtures were fabricated by spin coating followed by a lift-off method. It is generally known that sol–gel processed films are difficult to etch or remove by chemical and plasma techniques. In this novel process, Cobalt oxide microstructures could be fabricated by transformation of pre-fabricated nanocrystalline Cobalt oxide particles in a sol–gel process. Also, the growth of carbon nanotubes on fabricated Cobalt oxide films was investigated. It was found that different size multiwall carbon nanotubes could be grown on the Cobalt oxide films depending on the concentration of Cobalt Salt in sol–gel mixtures.
Yuji Kikukawa - One of the best experts on this subject based on the ideXlab platform.
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Synthesis, Structure Characterization, and Reversible Transformation of a Cobalt Salt of a Dilacunary γ-Keggin Silicotungstate and Sandwich-Type Di- and TetraCobalt-Containing Silicotungstate Dimers.
ChemInform, 2013Co-Authors: Yuji Kikukawa, Kosuke Suzuki, Kazuya Yamaguchi, Noritaka MizunoAbstract:A new Cobalt Salt of a dilacunary γ-Keggin silicotungstate (III) is prepared and utilized as a precursor for novel di- and tetraCobalt-containing silicotungstate dimers (V) and (VI).
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Synthesis, Structure Characterization, and Reversible Transformation of a Cobalt Salt of a Dilacunary γ-Keggin Silicotungstate and Sandwich-Type Di- and TetraCobalt-Containing Silicotungstate Dimers
Inorganic chemistry, 2013Co-Authors: Yuji Kikukawa, Kosuke Suzuki, Kazuya Yamaguchi, Noritaka MizunoAbstract:A Cobalt Salt of a γ-Keggin dilacunary silicotungstate, {CoL5}2[γ-SiW10O34L2] [Co-SiW10; L = N,N-dimethylformamide (DMF) or H2O], could be synthesized by the cation-exchange reaction of TBA4[γ-H4SiW10O36] (TBA = tetra-n-butylammonium) with 2 equiv of Co(NO3)2 with respect to TBA4[γ-H4SiW10O36] in a mixed solvent of DMF and acetone (97% yield). Each Co-SiW10 was linked by water molecules via a hydrogen-bonding network. Besides Co-SiW10, various kinds of isostructural M-SiW10 could be synthesized via the same procedure as that for Co-SiW10 (M = Mn(2+), Fe(2+), Ni(2+), Cu(2+), Zn(2+), and Cd(2+)). By the reaction of Co-SiW10 with 1 equiv of TBA6[γ-H2SiW10O36] in acetone, a silicotungstate dimer pillared by two Cobalt cations with a significantly slipped dimer configuration, TBA6[Co2(γ-H3SiW10O36)2]·3H2O (Co2), could be synthesized. By the reaction of Co-SiW10 with 3 equiv of TBAOH in acetone, a tetraCobalt-containing sandwich-type silicotungstate, TBA6[{Co(H2O)}2(μ3-OH)2{Co(H2O)2}2(γ-H2SiW10O36)2]·5H2O (Co4), could be synthesized. Compound Co4 possessed the tetraCobalt-oxygen core, [{Co(H2O)}2(μ3-OH)2{Co(H2O)2}2](6+), identical with those of previously reported Weakley-type sandwich polyoxometalates, [Co4(H2O)2(XM9O34)2](n-) (X = P(5+), Si(4+), Ge(4+), As(5+) or V(5+); M = Mo(6+) or W(6+)). The reversible transformation between these three compounds (Co-SiW10 ⇆ Co2, Co-SiW10 ⇆ Co4, and Co2 ⇆ Co4) took place by the addition and/or subtraction of required components in appropriate solvents, affording the desired products in high yields (71-93% yields).
Ambalangodage C. Jayasuriya - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of nanocrystalline Cobalt oxide via sol-gel coating
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2007Co-Authors: Ahalapitiya H. Jayatissa, Ambalangodage C. Jayasuriya, Tarun GuptaAbstract:Abstract Nanocrystalline Cobalt oxide thin films were fabricated by sol–gel processing method. The effect of Cobalt Salt amount in sol–gel mixture on film properties was investigated by means of Raman spectroscopy and atomic force microscopy. Micropatterns of these sol–gel mixtures were fabricated by spin coating followed by a lift-off method. It is generally known that sol–gel processed films are difficult to etch or remove by chemical and plasma techniques. In this novel process, Cobalt oxide microstructures could be fabricated by transformation of pre-fabricated nanocrystalline Cobalt oxide particles in a sol–gel process. Also, the growth of carbon nanotubes on fabricated Cobalt oxide films was investigated. It was found that different size multiwall carbon nanotubes could be grown on the Cobalt oxide films depending on the concentration of Cobalt Salt in sol–gel mixtures.
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Fabrication of nanocrystalline Cobalt oxide via sol–gel coating
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2007Co-Authors: Ahalapitiya H. Jayatissa, Ambalangodage C. Jayasuriya, Kun Guo, Tarun GuptaAbstract:Abstract Nanocrystalline Cobalt oxide thin films were fabricated by sol–gel processing method. The effect of Cobalt Salt amount in sol–gel mixture on film properties was investigated by means of Raman spectroscopy and atomic force microscopy. Micropatterns of these sol–gel mixtures were fabricated by spin coating followed by a lift-off method. It is generally known that sol–gel processed films are difficult to etch or remove by chemical and plasma techniques. In this novel process, Cobalt oxide microstructures could be fabricated by transformation of pre-fabricated nanocrystalline Cobalt oxide particles in a sol–gel process. Also, the growth of carbon nanotubes on fabricated Cobalt oxide films was investigated. It was found that different size multiwall carbon nanotubes could be grown on the Cobalt oxide films depending on the concentration of Cobalt Salt in sol–gel mixtures.