Molecular-Level Processing of Conjugated Polymers. 1. Layer-by-Layer Manipulation of Conjugated Polyions

Ferreira, Marystela; Rubner, Michael F.

doi:10.1021/ma00125a012

Cited by 356 publications

(292 citation statements)

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“…115,116 Another historical development came from its application to a wide range of biomolecules due to the comprehensive research on protein-based LbL assemblies performed by Kunitake and co-workers. 117,118 A simple analytical apparatus, the quartz crystal microbalance (QCM), was introduced for in situ evaluation of LbL assembling processes in a collaboration between Lvov, as LbL specialist, and Ariga, as QCM user, for thin film analyses entailed in a national research project led by Kunitake.…”

Section: History Of Layer-by-layermentioning

confidence: 99%

Layer-by-layer Nanoarchitectonics: Invention, Innovation, and Evolution

et al. 2013

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Materials fabrication with nanoscale structural precision based on bottom-up-type self-assembly has become more important in various current disciplines in chemistry including materials chemistry, organic chemistry, physical chemistry, analytical chemistry, biochemistry, colloid and surface chemistry, and supramolecular chemistry. Although the design of new materials based on nanoscale self-assembly is anticipated as a key concept, preparing complete three-dimensional structures at nanoscale precision remains a difficult target using current technologies. Rather, dimension-reduced approaches such as layering of two-dimensional nanostructures into precisely controlled lamellar nanomaterials are currently achievable. In particular, layer-by-layer (LbL) assembly is known as a highly versatile method for fabrication of controlled layered structures from various kinds of component materials using very simple, inexpensive, and rapid procedures. Therefore, fabrication of multilayer films through the LbL deposition process has attracted growing interest from various research communities. The high versatility and flexibility of LbL assembly is continuously creating new concepts, new materials, new procedures, and new applications. In this highlight review, we focus on nanoarchitectonics by LbL assembly. After an initial introduction on the invention and a brief history of the LbL assembly technique, innovations and the evolution of the technique are described based mainly on recent examples, which are categorized into two sections: (i) developments in methodology (technical, material, and phenomenological aspects with expansion of concept) and (ii) progress in applications (physical, chemical/biochemical, and biomedical applications).

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Section: History Of Layer-by-layermentioning

confidence: 99%

Layer-by-layer Nanoarchitectonics: Invention, Innovation, and Evolution

et al. 2013

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“…This method consists of the alternate deposition of polycation and polyanion layers on a solid substrate. [51][52][53][54] In addition to the simplicity of the preparation and the thickness control of the films, the most important advantage of the LbL technique is to enable the thorough interpenetration of polycation-polyanion layers. This feature gives rise to an improved interaction between polycation and polyanion, which may result in superior properties by the secondary doping of PANI and the enhancement of the electrochromic response.…”

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confidence: 99%

Spectroscopic, morphological and electrochromic characterization of layer-by-layer hybrid films of polyaniline and hexaniobate nanoscrolls

et al. 2012

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The combination of semiconducting oxides and polyaniline in the nanoscale range may result in hybrid materials having enhanced properties, such as electrochromism and charge capacity. This paper reports the spectroscopic, morphological and electrochromic characterization of hybrid films made up of hexaniobate one-dimensional (1D) nanoscrolls and polyaniline prepared by the layer-by-layer assembly technique (LbL). Secondary electron imaging and backscattered electron imaging techniques performed using a scanning electron microscope showed that polyaniline is adsorbed on the hexaniobate nanoscrolls, which confirms the combination of the components in the nanoscale domain. UV-VIS-NIR electronic spectra of the LbL hybrid films showed the absorption tail in the NIR region, assigned to delocalized polarons of the polyaniline. Resonance Raman spectra in the 1000-1700 cm À1 range indicated that hybrid films present a higher relative intensity of polaron bands at 1337 and 1508 cm À1 than pristine polyaniline in the emeraldine salt form. These results suggest that hexaniobate nanoscrolls induce a secondary doping of polyaniline. The cyclic voltammetry (CV) data for the hybrid film showed a specific capacity of 870 C cm À3 . According to CV results, the synergistic effect on charge storage properties of the hybrid material is attributed to the enhanced electroactivity of the hexaniobate component in the LbL film. Spectroelectrochemical experiments showed that the electrochromic efficiencies at 420 nm are ca. À41 and 24 cm 2 C À1 as the potential changes from 0.8 to À0.9 V and from À0.9 to À1.8 V, respectively, whereas at 800 nm the efficiencies are ca. À55 and 8 cm 2 C À1 for the same potential ranges. The electrochromic efficiencies and multi-colour character of the LbL film of hexaniobate nanoscrolls and polyaniline indicate that this novel hybrid material is an interesting modified electrode for electrochromic devices.

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“…In future work, we hope to demonstrate that this new process of magnetic film formation can be carried out with several quite different functional materials such as conjugated polymers, and nanosized metals. This remarkably simple technique provides molecularlevel control over the thickness and complicated architecture of multilayer magnetic, conducting, 15 and luminescent films. 16 Thus it offers a potentially powerful strategy for fabricating nanomagnetic, nanoelectronic-magnetic, nanomagnetic-optical, and nanomagnetic-electroluminescent devices.…”

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confidence: 99%