Preparation and characterization of ultrathin multilayer films based on polyoxometalate Mo8V2O28·7H2O

Wang, L.; Li, J.; Wang, E.B.; Xu, Lin; Peng, Jun; Li, Z.

doi:10.1016/j.matlet.2003.12.035

Cited by 9 publications

(10 citation statements)

References 21 publications

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“…Among the inorganic materials used are the polyoxometalates (POMs). These oxide aggregates constitute a unique class of molecular metal–oxygen clusters which show remarkable properties: enormous diversity of structures, variety of their properties based on their shapes, sizes, and charge densities, allowing their application in several different fields ranging from materials science to electrocatalysis. − Specifically, POM-based multilayer systems have been fabricated with a variety of cationic components, such as ruthenium(II) polypyridyl complexes, conducting and redox active polymers, − metalloporphyrins, polyelectrolytes, ,, and to a much lower extent with dye molecules; − the few published examples refer to POM-based LbL films with cationic phenothiazine and phenoxazine dye derivatives. , To the best of our knowledge, no LbL hybrid films of POMs and triarylmethane dye cations have been published. However, a few salts of triarylmethane dye cations (ca.…”

Section: Introductionmentioning

confidence: 99%

Multielectrocatalysis by Layer-by-Layer Films Based on Pararosaniline and Vanadium-Substituted Phosphomolybdate

2015

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Hybrid multilayer films based on the two molecular species pararosaniline (PR) and Keggin-type polyoxometalate K5[PMo11VO40)] (PMo11V) were prepared on different substrates using the electrostatic layer-by-layer (LbL) self-assembly method. The film buildup, monitored by electronic spectroscopy, showed a regular stepwise growth, and X-ray photoelectron spectroscopy data confirmed the presence of both molecular components within the LbL films. Scanning electron microscopy images revealed a completely covered surface with a nonuniform distribution of film components, and atomic force microscopy images confirmed a rough surface. The film electrochemical responses and permeability were studied by cyclic voltammetry. Films revealed three Mo-based redox processes (Mo(VI) → Mo(V)) and one V-based redox process (V(V) → V(IV)) in the potential range between 0.8 and -0.4 V vs Ag/AgCl. Studies with the redox probes [Fe(CN)6](3-/4-) and [Ru(NH3)6](3+/2+) showed that the films maintain the permeability even after six bilayers. Furthermore, the {PR/PMo11V}n multilayer films exhibit excellent Mo-based electrocatalytic activity toward reduction of iodate and V-based electrocatalytic activity toward ascorbic acid oxidation, thus acting as a versatile multielectrocatalyst.

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Section: Introductionmentioning

confidence: 99%

Multielectrocatalysis by Layer-by-Layer Films Based on Pararosaniline and Vanadium-Substituted Phosphomolybdate

2015

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“…For the majority of these applications, it is important that the HPA can be immobilized onto a range of surfaces, resulting in stable and accessible thin films in which the inherent solution-phase properties of the HPA are maintained in the solid state. Various techniques have been employed to surface immobilize HPAs, including polymeric films, − electrochemical deposition, adsorption, , Langmuir–Blodgett films, sol–gel films, , self-assembled monolayers, and layer-by-layer assembly. − Layer-by-layer assembly is a rapid and simple technique for fabricating well-organized molecularly layered structures and for obtaining functional materials with precisely controlled thickness and uniformity.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Nitrite and Nitrate Electrocatalytic Reduction through the Employment of Self-Assembled Layers of Nickel- and Copper-Substituted Crown-Type Heteropolyanions

et al. 2015

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“…[14][15][16][17][18] In recent years, considerable attention has been paid to the amphiphilic molecules incorporated with functional units, which can result in the formation of assemblies with novel physical properties. [19] Previous studies have shown that a variety of units such as oligo(p-phenylene vinylene), [20] thiophene, [21] fullerene [22] and metal ions can be utilized to fabricate functional amphiphiles.…”

Section: Introductionmentioning

confidence: 99%

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

Song

McMillan

Long

et al. 2008

Chemistry A European J

140

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Grafting of C-6, C-16 and C-18 alkyl chains onto the hydrophilic Mn-Anderson clusters (compounds 2-4) has been achieved. Exchange of the tetrabutyl ammonium (TBA) with dimethyldioctadecyl ammonium (DMDOA) results in the formation of new polyoxometalate (POM) assemblies (compounds 5-6), in which the POM cores are covalently functionalized by hydrophilic alkyl-chains and enclosed by surfactant of DMDOABr. As a result, we have been able to design and synthesize POM-containing hydrophobic materials beyond surfactant encapsulation. In solid state, scanning electron and transmission electron microscopy (SEM and TEM) studies of the TBA salts of compounds 3 and 4 show highly ordered, uniform, reproducible assemblies with unique segmented rodlike morphology. SEM and TEM studies of the DMDOA salts of compounds 5 and 6 show that they form spherical and sea urchin 3D objects in different solvent systems. In solution, the physical properties of compound 5 and 6 (combination of surfactant-encapsulated cluster (SEC) and surface-grafted cluster (SGC)) show a liquid-to-gel phase transition in pure chloroform below 0 degrees C, which are much lower than other reported SECs. By utilizing light scattering measurements, the nanoparticle size for compounds 5 and 6 were measured at 5 degrees C and 30 degrees C, respectively. Other physical properties including differential scanning calorimetry have been reported.

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Preparation and characterization of ultrathin multilayer films based on polyoxometalate Mo8V2O28·7H2O

Cited by 9 publications

References 21 publications

Multielectrocatalysis by Layer-by-Layer Films Based on Pararosaniline and Vanadium-Substituted Phosphomolybdate

Multielectrocatalysis by Layer-by-Layer Films Based on Pararosaniline and Vanadium-Substituted Phosphomolybdate

Enhancement of Nitrite and Nitrate Electrocatalytic Reduction through the Employment of Self-Assembled Layers of Nickel- and Copper-Substituted Crown-Type Heteropolyanions

Design of Hydrophobic Polyoxometalate Hybrid Assemblies Beyond Surfactant Encapsulation

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