V2O5 xerogel

In addition to structural information, Li MAS NMR Tz relaxation measurements and analysis of Li line shapes have been used to probe the dynamics of the lithium ions. Holland et al. identified two different species with different mobilities (interfacial Li (longer Tz, rapid dynamics) and intercalated lithium (shorter Tz, slower dynamics)) in the elec-trochemically lithiated V2O5 xerogel matrix. Li hopping frequencies were extracted from an analysis of the Li line widths and the appearance of a quadru-polar splitting as the temperature decreased in a related system. ... 

Figure 16.23. Schematic structures of PEO conformation in V2O5 xerogel and their expected electron density projections along the c axis, (a) coil conformation, (b) zigzag conformation forming bilayer. [Adapted, by permission, from Liu Y J, Schindler J L, DeGroot D C, Kannewurf C R, Hirpo W, Kanatzidis M G, Chem. of Mat., 8, No.2, 1996, 525-34.]...

Figure 6.3 Representation of the V2O5 fibrii with approximate dimensions. (Reprinted with permission from Mat. Res. Proc., Voi. 210, Pittsburgh, PA, Layered V2O5 Xerogels Host-Guest Chemistry and Conductive Poiymers by C.-G. Wu and M. G. Kanatzidis, 429—442. Copyright (1991) Materials Research Society)...

The direct intercalation of polyanihne doped with 12-phosphormohbdic acid (PANI-PMA) into V2O5 xerogels was reported by Posudievsky et al. Treatment of an aqueous solution of the xerogel or its lithium bronze with a solution of PANI-PMA in m-cresol, in equal amounts, led to the formation of (PANI-PMAo.o7)o.34V205. The conductivity of the nanocomposite was found to be 5.0 x 10 S cm [32]. 

Figure 6.9 Lamellar arrangement of PE0/V20s.nH20 composite. (Reprinted with permission from Chemistry of Materials, Intercalation of poly(ethylene oxide) in vanadium pentoxide (V2O5) xerogel by Y. J. Liu, D. C. DeCroot, J. L. Schindler et al., 3, 6. Copyright (1991) American Chemical Society)...

Ternary composites with electroactive components were also discussed by Gomez-Romero and coworkers in one of their recent publications [48]. The ternary composites consisted of doped-polyaniline (PANI) or doped-polypyrrole (Ppy) intercalated into V2O5 xerogels. The dopant anion for the conducting polymers was [Fe(CN)g] (HCF), derived from H3Fe(CN)6. More specifically, the synthesis of Ppy/HCF/V205 and PANI/HCFA 20s was carried out by treating the monomer (aniline or pyrrole)... 

M. G. Kanatzidis, C-G. Wu, H. O. Marcy, D. C. DeGroot, and C. R. Kannewurf, Conductive polymer/oxide bronze nanocomposites. Intercalated polythiophene in V2O5 xerogels, Chem. Mater., 2, 222-224 (1990). 

C.-G. Wu, D.C. DeGroot, H.O. Marcy, J.L. Schindler, C.R. Kannewurf, Y.-J. liu, W. Hirpo, and M.G. Kanatzidis, Redox intercalative polymerization of aniline in V2O5 xerogel. The postintercalative intralamellar polymer growth in polyaniline/metal oxide nanocomposites is facilitated by molecular oxygen, Chem. Mater., 8, 1992-2004 (1996). 

LOW-DIMENSIONAL ELECTRICALLY CONDUCTIVE SYSTEMS INTERCALATED POLYMERS IN V2O5 XEROGELS... 

Guerra, E.M., Silva, G.R., Mulato, M. Extended gate field effect transistor using V2O5 xerogel sensing membrane by sol-gel method. Solid State Sci. 11, 456-460 (2009)... 

Holland G, Buttry D, Yarger J (2002) Li-7 NMR studies of electrochemically lithiated V2O5 xerogels. Chem Mater 14(9) 3875-3881... 

Redox intercalation polymerization of aniline, pyrrole, and dithiophene using a V2O5 xerogel affords polyconjugated anisotropic polymers. Intercalation is... 

Fig. 8. First discharge curves of (a) V2O5 xerogel dried at 100°C, (b) poly(aniline)—V2O5 nanocomposite as prepared, without treatment, (c) V2O5 xerogel dried at 250°C, and (d) poly(aniline)-V20s nanocomposite treated at 80°C for 5 h, as a cathode material by coupling with a lithium metal anode using 1 M LiC104 in a 1 1 mixture of ethylene carbon-ate/dimethoxyethane as electroljde (note x is the ratio intercalated Li /V205). From Ref. 51, with permission.

Figure 6. Intercalation of long-chain alkylammonium (CnH2n+lNH3) into a V2O5 xerogel. Orientation of intercalated molecules depend on the lenght of the alkyl chain.

Kanatzidis, Wu C.G., Marcy H.O., DeGroot D.C. and Kannewurf C.R. (1990) "Conductive polymer/oxide bronze nanocomposites.lntercalated polythiophene in V2O5 xerogels" Chem. Mater. 2, 222-24. 

Kanatzidis, M.G. Wu, C.-G. Marcy, H.O. DeGroot, D.C. Kannewurf, C.R. Conductive polymCT-oxide bronze nanocomposites intercalated polythiophene in V2O5 xerogels. CherrL Mater. 1990, 2, 222-224. Intercalation of polyfethylene oxide) in vanadium pentoxide xerogel. Chem. Mater. 1991, 3, 992-994. Synthesis, structure, and reactions of polyfethylene oxide)/V205 intercalative nanocomposites. Chem. Mater. 1996, 8, 525-535. 

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