Layer-by-layer self-assembled multilayers of redox polyelectrolytes and gold nanoparticles

Ferreyra, Nancy F.; Coche-Guérente, Liliane; Fatisson, Julien; Teijelo, M. López; Labbé, Pierre

doi:10.1039/b305347d

Cited by 44 publications

(44 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[18][19][20][21][22][23] The existing studies have demonstrated that multilayer GNP films as advanced functional materials are quite different in optical and electric properties from bulk gold. [13,14,25] Layer-by-layer (LbL) assembly that is based on the alternate adsorption of oppositely charged species has been a powerful technique for preparing multilayer GNP films because of its simplicity, flexibility, and effectiveness. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] In addition to dithiols and PAH, proteins can serve as effective linking agents for the fabrication of multilayer thin films of GNP/protein nanocomposites.…”

Section: Introductionmentioning

confidence: 99%

Layer‐by‐Layer Fabrication and Characterization of Gold‐Nanoparticle/Myoglobin Nanocomposite Films

Qi¹,

Honma²,

Ichihara³

et al. 2005

Adv Funct Materials

View full text Add to dashboard Cite

Multilayer thin films of ∼ 7 nm diameter gold nanoparticles (GNPs) linked with horse heart myoglobin (Mb) are fabricated, for the first time, by layer‐by‐layer (LbL) assembly on glass slides, and silicon and plastic substrates. The GNP/Mb nanocomposite films show sharp surface plasmon resonance (SPR) absorption bands that are used to follow the LbL growth of the film and to determine the kinetics of GNP adsorption on the Mb‐modified surface. The GNP/Mb nanocomposite films are characterized using atomic force microscopy, transmission electron microscopy, polarized UV‐vis spectroscopy, and spectroscopic ellipsometry. The GNPs in the multilayer films are spatially separated from one another, and interparticle interactions remain in the film, making it optically anisotropic. The GNP/Mb nanocomposite films are stable in air at temperatures up to 100 °C, and can withstand successive immersions in strongly acidic and basic solutions. The SPR absorption band of the GNP/Mb nanocomposite film in air exhibits a red‐shift in the wavelength maximum and an increase in the maximum absorbance relative to that in water. This result, which is in contrast to that observed with a GNP monolayer on an aminosilane‐functionalized substrate, suggests the shrinkage in air and swelling in water of Mb molecules embedded in the nanocomposite film.

show abstract

Section: Introductionmentioning

confidence: 99%

Layer‐by‐Layer Fabrication and Characterization of Gold‐Nanoparticle/Myoglobin Nanocomposite Films

Qi¹,

Honma²,

Ichihara³

et al. 2005

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…The absorption maxima of these bands (l max ) were fixed at a wavelength of 542 nm and did not change with the number of dipping cycles. Previous reports [21][22][23][24][25][26][27] have pointed out that in multilayer gold nanoparticles, strong interactions between neighboring dipolar particles can readily take place, which cause a red shift in l max with increasing number of dipping cycles and/or generate a new absorption band at a longer wavelength. In our case, however, no such features appear in the spectra, as shown in Figure 2, suggesting that the gold nanoparticles in films are spatially separated from each other, probably because of the long PLGA chains attached to the gold nanoparticles, and that the interparticle interactions are relatively weak.…”

Section: Resultsmentioning

confidence: 99%

“…The LbL assembly takes advantage of the same attractive forces that form complexes but in a controlled manner that produces thin, conformal films that can coat a variety of surfaces and thus are a powerful method for fabricating multilayer gold nanoparticle films. [15][16][17][18][19][20][21][22][23][24][25][26][27] In spite of these many reports, to the best of our knowledge, well-controlled gold nanoparticle assemblies guided with a polypeptide network have not yet been reported. The aim of this article is to construct homogeneously well-ordered gold nanoparticle multilayers assisted with a b-sheet peptide template.…”

Section: Introductionmentioning

confidence: 98%

Layer-by-layer fabrication of well-packed gold nanoparticle assemblies guided by a β-sheet peptide network

Higashi

Takagi

Koga

2010

Polym J

View full text Add to dashboard Cite

In this study, we describe the first demonstration of well-ordered multilayer thin films of gold nanoparticles through a layer-bylayer (LbL) technique assisted by a polypeptide template. Anionic poly(L-glutamic acid) (PLGA)-modified gold nanoparticles were prepared as building units for LbL self-assembly. Two types of synthetic polymers, poly(L-lysine) (PLL) and poly(allylamine), were used as polycations that carry the same amino groups at the side chain, although the former is a polypeptide and the latter is a vinyl polymer. The deposition process and the resultant multilayer films were characterized by means of absorption, circular dichroism, Fourier transform infrared and atomic force microscopy measurements. Experimental results revealed that LbL multilayer properties, such as thickness, conformation of the peptide component, homogeneity and periodicity of nanoparticle layers, were significantly affected by the kind of polycations present. In particular, the combination of anionic PLGA-coated gold nanoparticles and cationic PLL induced b-sheet formation, which enabled the fabrication of a homogeneously well-packed gold nanoparticle multilayer without aggregation.

show abstract

“…Na Figura 2b, observa-se que o crescimento da arquitetura supramolecular de PAH/FtTsCo é progressivo e linear, o que acarreta em etapas de deposição uniformes. 12,13,19,20,22 Resultados similares foram encontrados nos sistemas PAH-AuNP/ FtTsNi, 41 (Figura 3). 20,43,44 Processos irreversíveis envolvendo ftalocianinas metálicas são comuns devido, principalmente, a efeitos de agregação da espécie FtTsCo(II) na superfície do eletrodo.…”

Section: Deposição Das Multicamadas Pah/fttscounclassified

“…7,8 A automontagem ganhou atenção especial devido a vantagens tais como fácil manipulação, baixo custo operacional, reprodutibilidade, versatilidade dos materiais utilizados e elevado controle da arquitetura molecular. 2,[9][10][11][12][13][14][15][16][17][18][19][20] Diversos materiais têm sido empregados na técnica LbL visando construção de filmes nanoestruturados, como metaloftalocianinas, 1,2,11-31 porfirinas, [32][33][34] polímeros condutores, 1,10 diazo-resinas, 15 nanopartículas metálicas 3,16,35 e moléculas biológicas. 14,16,17 Em especial, compostos de coordenação, quando imobilizados em filmes LbL, apresentam comportamento químico diferenciado quando comparados em solução e no estado sólido, situações nas quais efeitos supramoleculares devem ser levados em consideração.…”

Section: Introductionunclassified

Organização supramolecular da ftalocianina de cobalto(II) e seu efeito na oxidação do aminoácido cisteína

et al. 2010

View full text Add to dashboard Cite

Recebido em 13/2/09; aceito em 9/9/09; publicado na web em 23/2/10 SUPRAMOLECULAR ORGANIZATION OF COBALT (II) PHTHALOCYANINE ON THE PATHWAY OF CYSTEINE OXIDATION. The interest in the chemistry of cobalt (II) tetrasulfonated phthalocyanine (PcTsCo) comes mainly from its macrocycle-ligand structure combined with their special chemical characteristics, such as high solubility, well-defined redox reactions and remarkable optical absorption in the visible region. In this work, we use layer-by-layer technique in order to assemble CoTsPc and poly(allylaminehydrochloride) (PAH) in hybrid supramolecular system. The electronic spectroscopy and cyclic voltammetry techniques were utilized to study PAH/CoTsPc multilayers growth and the cysteine catalytic oxidation. PAH/CoTsPc showed high electrochemical stability and worthwhile to mention is the remarkable influence of supramolecular arrangement on the final redox properties of the system. Keywords: cobalt phthalocyanine; cysteine; supramolecular. INTRODUÇÃODiversos tipos de materiais nanoestruturados podem ser estudados mediante técnicas de deposição de filmes ultrafinos, 1,2 principalmente as nanoarquiteturas híbridas.1-3 Pode-se citar a técnica Langmuir-Blodgett (LB), onde camadas moleculares são preparadas em ambientes com elevado controle molecular.1,4-6 Nos filmes LB, as estruturas são extremamente organizadas e podem interagir fortemente com um substrato sólido (vidro, quartzo, silício, ouro etc). Uma vez controlados os parâmetros de deposição, diversas estruturas podem ser idealizadas através da deposição de multicamadas de vários compostos, 1,4 como biomoléculas, complexos de coordenação, polímeros sintéticos e condutores, cristais líquidos poliméricos, entre outros. Em alternativa à técnica LB, Decher 20,25,28,[42][43][44] imobilizadas em filmes finos LbL apresentam processos redox bem definidos, elevada estabilidade química e um arranjo geométrico quadrado planar, onde os grupos pirrois, no plano equatorial, apresentam-se inertes em relação às reações de substituição.2,45-47 Além disso, as FtTsCo têm sido utilizadas para construção de sensores para moléculas biológicas e catalisadores de diversas espécies, como glutationa (GSH), 22,23,48 cisteína (CiSH), [23][24][25][26][27]48 histidina, 26 monóxido de nitrogênio, 21,28,31 pesticidas, 29 glucose 30 e hidrazina. 31Desta forma, este trabalho apresenta as propriedades supramoleculares de filmes multicamadas contendo FtTsCo(II) e polialilamina (PAH) (PAH/FtTsCo). Utilizou-se a voltametria cíclica e a espectroscopia eletrônica na região do visível como técnicas de investigação. Por fim, avaliaram-se as propriedades eletrocatalíticas do sistema PAH/FtTsCo para oxidar o aminoácido cisteína.

show abstract

Layer-by-layer self-assembled multilayers of redox polyelectrolytes and gold nanoparticles

Abstract: Construction and characterization of structural and charge transport properties of electrostatically LbL self-assembled multilayers of gold nanoparticles and a viologen-based redox-active polyelectrolyte is reported.

Cited by 44 publications

References 17 publications

Layer‐by‐Layer Fabrication and Characterization of Gold‐Nanoparticle/Myoglobin Nanocomposite Films

Layer‐by‐Layer Fabrication and Characterization of Gold‐Nanoparticle/Myoglobin Nanocomposite Films

Layer-by-layer fabrication of well-packed gold nanoparticle assemblies guided by a β-sheet peptide network

Organização supramolecular da ftalocianina de cobalto(II) e seu efeito na oxidação do aminoácido cisteína

Contact Info

Product

Resources

About