Layer-by-Layer Nanostructured Hybrid Films of Polyaniline and Vanadium Oxide

Ferreira, Marystela; Zucolotto, Valtencir; Huguenin, Fritz; Torresi, Roberto M.; Oliveira, O.N.

doi:10.1166/jnn.2001.080a

Cited by 35 publications

(30 citation statements)

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“…One popular example is the V 2 O 5 /polyaniline nanocomposite film fabricated by the LbL technique, and the intimate contact between the oxide and polymer on the nanoscale results in an improved intercalation capacity. [138] Later, a V 2 O 5 nanocomposite alternating with blends of chitosan and poly(ethylene oxide) (PEO) was prepared using the LbL technique and investigated the charge storage capability in such nanoarchitectures. [139] A [143] The resulted composite electrode shows a capacity of 270 mA h g À1 at a rate of 5/C, higher than the capacity (180 mA h g À1 at C/5 rate) of the standard electrode without PEO.…”

Section: Nanostructured Polymer-oxide Compositesmentioning

confidence: 99%

Developments in Nanostructured Cathode Materials for High‐Performance Lithium‐Ion Batteries

2008

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Nanostructured materials lie at the heart of fundamental advances in efficient energy storage and/or conversion, in which surface processes and transport kinetics play determining roles. This Review describes some recent developments in the synthesis and characterization of nanostructured cathode materials, including lithium transition metal oxides, vanadium oxides, manganese oxides, lithium phosphates, and various nanostructured composites. The major goal of this Review is to highlight some new progress in using these nanostructured materials as cathodes to develop lithium batteries with high energy density, high rate capability, and excellent cycling stability resulting from their huge surface area, short distance for mass and charge transport, and freedom for volume change in nanostructured materials.

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Section: Nanostructured Polymer-oxide Compositesmentioning

confidence: 99%

Developments in Nanostructured Cathode Materials for High‐Performance Lithium‐Ion Batteries

2008

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“…Figures 1 and 2 illustrate the topography of the multilayer thin films deposited on silicon wafers, as a function of the As Figure 2(a) shows, when PAMPS was used as polyanion, after 2.5 double layers few globular patterns with low sizes are formed, similar with other polyelectrolyte multilayers. 16,37 At the adsorption pH of 5.5, CS has a worm-like conformation, but PAMPS, a strong polyanion has a random coil conformation. The presence of globular species on the multilayer surface may appear because the conformation of the polyions molecules could be preserved after their adsorption.…”

Section: Resultsmentioning

confidence: 99%

Composite multilayer thin films morphology and their interactions with proteins as a function of polyanion structure

et al. 2011

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Composite multilayer thin films have been constructed on planar substrates by the layer-by-layer deposition of chitosan (CS) and two strong polyanions different by the density of sulfonic groups, i.e., poly(sodium 2-acrylamido-2-methylpropanesulfonate) (PAMPS) and a random copolymer of AMPS with acrylic acid, P(AMPS 55 -co-AA 45 ); all deposition steps being performed at pH 5.5. The effect of the polyanion structure and number of adsorbed layers on the film morphology was examined by atomic force microscopy and contact angle measurements. The polyanion structure strongly affected the multilayer morphology, more swollen and less dense films being formed when P(AMPS 55 -co-AA 45 ) was used compared to PAMPS. The sorption of two proteins, human serum albumin and bovine serum albumin, on the film surface with CS as the last layer adsorbed, as a function of the polyanion structure, indicates that a higher amount of protein had been sorbed mainly on the film surface when PAMPS was used as a polyanion in the film construction.

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“…18 The final properties of LB films depend on the molecular architecture, in addition to the complex characteristics determined by the choice of the ligand. This has motivated several works on organized structures containing metal complexes, in monolayers, [19][20][21][22] [24][25][26][27] The molecular organization was extracted from the information provided by surface pressure-molecular area (π-A) isotherms, atomic force microscopy (AFM), UV-vis absorption, FT-IR, reflection-absorption infrared spectroscopy (RAIRS), Raman scattering, and fluorescence. 4,27,28 Rupic immobilized in LB film is useful for the selective oxidation of dopamine and ascorbic acid, and yielded more reproducible surfaces in comparison with carbon paste.…”

Section: Introductionmentioning

confidence: 99%

A novel binuclear ruthenium complex: spectroscopic and electrochemical characterization, and formation of Langmuir and Langmuir-Blodgett films

Wohnrath

Santos

Sandrino

et al. 2006

J. Braz. Chem. Soc.

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O complexo [{RuCl 3 (dppb)} 2 (µ-4,4'-bipy)] (dppb = PPh 2 (CH 2 ) 4 PPh 2 ; 4,4'-bipy= 4,4'-bipiridil) foi obtido por meio da reação entre 4,4'-bipiridina e mer- [RuCl 3 (dppb)] . H 2 O, em bom rendimento. As características do complexo binuclear obtido, estudadas por medidas de FT-IR, UV-Vis, EPR e análise elementar foram similares às do complexo [RuCl 3 (dppb)L] (L= N-heterociclo).[{RuCl 3 (dppb)} 2 (µ-4,4'-bipy)] é solúvel em solventes fracamente polares, facilitando a sua utilização para produzir filmes de Langmuir e Langmuir-Blodgett (LB). Enquanto que filmes cast e o complexo em solução são vermelhos, filmes LB são azul-esverdeados, provavelmente devido à oxidação da bisfosfina. A natureza nanoestruturada dos filmes LB, se manifestou nas medidas eletroquímicas, já que estes filmes exibem maior corrente de pico do que os filmes cast e dipcoated. As respostas eletroquímicas destes filmes são caracterizadas pelo processo Ru [{RuCl 3 (dppb)} 2 (µ-4,4'-bipy)] was prepared from the reaction of the 4,4'-bipyridine and mer-[RuCl 3 (dppb)] . H 2 O, in good yield. The characteristics of the binuclear complex studied with FT-IR, UV-Vis, EPR and elemental analysis were similar to those of the [RuCl 3 (dppb)L] (L= Nheterocycle). [{RuCl 3 (dppb)} 2 (µ-4,4'-bipy)] is soluble in weakly polar organic solvents, facilitating its use in the production of Langmuir and Langmuir-Blodgett (LB) films production. While the cast films and the complex in solution were red, the LB films were green-bluish, probably due to oxidation of the bisphosphine. The nanostructured nature of the LB films was manifested in electrochemical measurements, as these films exhibited higher peak currents than cast or dipcoated films. For all films, the electrochemical response was dominated by the Ru III Ru III /Ru II Ru II process, which differed from that of the binuclear compound. For the latter, an irreversible process appeared due to formation of new species. The electroactivity of LB films from [{RuCl 3 (dppb)} 2 (µ-4,4'-bipy)] also pointed to their possible use in electrochemical devices.

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Layer-by-Layer Nanostructured Hybrid Films of Polyaniline and Vanadium Oxide

Cited by 35 publications

References 0 publications

Developments in Nanostructured Cathode Materials for High‐Performance Lithium‐Ion Batteries

Developments in Nanostructured Cathode Materials for High‐Performance Lithium‐Ion Batteries

Composite multilayer thin films morphology and their interactions with proteins as a function of polyanion structure

A novel binuclear ruthenium complex: spectroscopic and electrochemical characterization, and formation of Langmuir and Langmuir-Blodgett films

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