Synthesis, structure, and reaction of poly(ethylene oxide)/V{sub 2}O{sub 5} intercalative nanocomposites
- Michigan State Univ., East Lansing, MI (United States); and others
the intercalation of poly(ethylene oxide) (PEO) in layered V{sub 2}O{sub 5} xerogel and the structural and physicochemical characterization of the products is reported. The synthesis of PEO/V{sub 2}O{sub 5} nanocomposites is achieved by simply mixing aqueous solutions of PEO with aqueous V{sub 2}O{sub 5} gels followed by slow water evaporation. Several different phases of PEO/V{sub 2}O{sub 5} composites can be obtained by varying the component ratios. The interlayer distance of (PEO){sub x}V{sub 2}O{sub 5} varies from 13.2 {angstrom}, at x=0.5, to 16.8 {angstrom} at x = 1.0, to 17.6 {angstrom} at 1<3, and to 18.3 {angstrom} at x{ge}3. One-dimensional electron density calculations based on X-ray diffraction data (perpendicular to layers) show that the composites contain a monolayer of PEO molecules when x < 1 and a bilayer when x {ge}1. The data suggests that the PEO chains are arranged side-by-side in a fully extended conformation between the layers forming corrugated mono- or bilayers. The (PEO){sub x}V{sub 2}O{sub 5}{center_dot}nH{sub 2}O intercalation compounds are water swellable and light sensitive. UV radiation causes dramatic changes in the electronic structure of V{sub 2}O{sub 5} and results in enhanced electrical conductivity, thermoelectric power, magnetic susceptibility, and electron paramagnetic resonance spectra of the irradiated products are self-consistent and suggest an increased V{sup 4+} concentration in the layers and n-type charge transport. Lithium ion redox intercalation was performed on the PEO/V{sub 2}O{sub 5} composites by reaction with LiI. Variable-temperature {sup 7}Li solid-state NMR studies of the Li/PEO/V{sub 2}O{sub 5} materials are reported. 33 refs., 15 figs., 5 tabs.
- OSTI ID:
- 369915
- Journal Information:
- Chemistry of Materials, Vol. 8, Issue 2; Other Information: PBD: Feb 1996
- Country of Publication:
- United States
- Language:
- English
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