A Combinatorial Approach for the Synthesis and Characterization of Polymer/Vanadium Oxide Nanocomposites

Abstract

Vanadium pentoxide xerogels were prepared by the hydrolysis of VO(OC3H7)3 by the sol−gel process. The generation of V2O5 was optimized by a combinatorial approach incorporating rapid screening by Raman spectroscopy. The latter revealed crystallites of vanadium oxide. Subsequently poly(p-ethylphenol) (PEP)/V2O5 nanocomposites were prepared by the sol−gel process at the optimized molar ratio of VO(OC3H7)3/H2O/acetone = 1/45/300. Evidence from Raman spectra indicated that the presence of PEP did not interfere in the formation of crystalline V2O5 in the composites. FTIR also exhibited interaction between PEP and V2O5. TEM showed a fibrous V2O5 structure dispersed in the PEP matrix.

Intercalation compounds based on vanadium(V) oxide xerogel

“…By intercalation of such water-soluble polymers as tetrakis(N-methyl-4-pyridyl)porphine, 76 poly(ethylene glycol), 77 poly(propylene glycol), poly(vinylpyrrolidone), methylcellulose 78 and poly(4-ethylphenol) 79 80 Intercalation of C 5 H 8 N 2 OS molecules was found to increase thermal stability of the xerogel (from 345 to 370 8C). As the temperature decreases from +50 to 750 8C, the electroresistivity increases sharply for these compounds, and the copper-containig xerogels always possess lower resistivities.…”

“…By intercalation of such water-soluble polymers as tetrakis(N-methyl-4-pyridyl)porphine, 76 poly(ethylene glycol), 77 poly(propylene glycol), poly(vinylpyrrolidone), methylcellulose 78 and poly(4-ethylphenol) 79 81,82 The composite retains the laminar structure of the xerogel at x < 0.02, its interlayer distance is *15 # A. A thin-film sample of this material possesses high stability in the electrochemical intercalation ± deintercalation of Li + and is completely recovered even after 60 oxidation ± reduction cycles.…”

Apparatus for deposition of composition spread alloy films: The rotatable shadow mask

“…1,2 These high throughput methods have been popularized in the biomolecular sciences, catalysis, electrochemistry, photovoltaic sciences, and other areas of materials science. [3][4][5][6][7][8][9][10][11][12] High throughput methods have three principal elements. The first is the preparation of large numbers of different materials samples that form the elements of a materials library.…”

Compact tool for deposition of composition spread alloy films

“…4,5 Combinatorial approaches have also resulted in discovery of new materials for applications as catalysts, polymers, superconductors, magnetic materials, structural materials, and coatings. [6][7][8][9][10] These methods have been applied to the study of a wide variety of materials properties including stress, hardness, and catalytic activity. [11][12][13] Design of the combinatorial sample library is a key to successful high throughput experimentation.…”