Role of poly-3-methylthiophene structure determined by AFM on the dielectric constant spectra

Chao, F.; Costa, M.; Jin, Gang; Tian, Chang

doi:10.1016/0013-4686(94)80055-3

Cited by 39 publications

(33 citation statements)

References 41 publications

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“…In the present work, calculated values of n and k parameters in very good agreement with those published for the same polymer [14,17] dictated the choice of h =1. Table 2 presents the calculated refractive indexes and extinction coefficients, illustrating the influence of the electrochemical mode employed for P(3MeTh) preparation and the dependence on the polymer growth potential and on its state of oxidation.…”

Section: Resultssupporting

confidence: 87%

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The heterogeneous growth of P(3MeTh)—an ellipsometric study

Abrantes¹,

Correia²,

Jin³

2001

Electrochimica Acta

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Successive thicker P(3MeTh) layers are analysed by ex situ conventional and imaging ellipsometry. Thin films display a smooth surface, are compact and homogeneous while for a growth charge above 20 mC cm − 2 the polymer structure modifies to a still uniform but less dense layer. A two-layer model is used and a mathematical procedure is developed to obtain, simultaneously, from the experimental ellipsometric parameters, Z and c, the thickness and the complex refractive index of P(3MeTh) films grown up to 80 mC cm − 2 . Thicker polymer layers are disordered and present a high degree of surface roughness.

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Section: Resultssupporting

confidence: 87%

“…The h parameter is known to depend on the working conditions [17] being reported values between 1 and 10 [24 -28]. In the present work, calculated values of n and k parameters in very good agreement with those published for the same polymer [14,17] dictated the choice of h =1.…”

Section: Resultssupporting

confidence: 86%

The heterogeneous growth of P(3MeTh)—an ellipsometric study

Abrantes¹,

Correia²,

Jin³

2001

Electrochimica Acta

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“…Potentiostatic i-t transient experiment is mainly used for kinetic and mechanistic investigation. Nucleation and growth mechanisms of electropolymerization of thiophene [33][34][35][36], aniline [37][38][39], and pyrrole [40] have been investigated by using potentiostatic i-t transient technique. However, the nucleation and growth mechanism for the formation poly(MB) has not been studied until now.…”

Section: Introductionmentioning

confidence: 99%

Nucleation and Growth Mechanism of Electropolymerization of Methylene Blue: The Effect of Preparation Potential on Poly(methylene blue) Structure

2010

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Nucleation and growth mechanism of electropolymerization of methylene blue (MB) in a basic medium and the effect of preparation potential on poly(MB) film structure were investigated by using cyclic voltammetry, potentiostatic current-time transient, scanning tunneling microscopy (STM), atomic force microscopy (AFM), and UV-vis. absorption spectroscopy techniques. Electropolymerization of MB has been achieved by potentiodynamic (cyclic voltammetry) and potentiostatic (constant potential) techniques. The potentiostatic current-time transients fitted with a theoretical model and morphological studies indicate that nucleation and growth mechanism of poly(MB) starts with a progressive layer-by-layer nucleation and growth besides random adsorption. Nucleation and growth of poly(MB) follows a process between progressive layer-by-layer and 3-D instantaneous mechanism resulting in highly-oriented poly(MB) nanofibers with increasing poly(MB) film thickness. Cyclic voltammetry and morphological studies exhibit that poly(MB) film structure changes depending on the preparation potential. Poly(MB) films prepared at the potential values of 900 and 950 mV show a well-ordered, smooth surface but at the potential values higher than 1000 mV, rough polymer surface arises as overoxidation takes place. UV-vis. absorption spectra of poly(MB) film and MB monomer show three peaks. The peak at 410 nm for poly(MB) shows 100 nm blue shift when compared to the MB monomer and is attributed to poly(MB) formation on the electrode.

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“…A forte interação entre elétrons π leva à formação de pilhas que seguem a orientação da primeira monocamada, diferindo da estrutura cristalina do material [182] . Por outro lado, Tian et alli [183] reportaram que filmes finos de poli-3-metiltiofeno exibem um perfil anisotrópico de crescimento gerando fibrilas, mas essa anisotropia desaparece em filmes mais espessos. Estruturas fibrilares também foram observadas em filmes polimerizados de poli[(4-vinilpiridina)Os(bipy) 2 Cl] + [184] .…”

Section: Formação De Filmesunclassified

“…Uma inspeção numa área maior revelou que os grânulos se estendem de forma anisotrópica, gerando estruturas fibrilares que percorrem a superfície em zigzag (não mostrado). Resultados similares envolvendo crescimento anisotrópico em filmes finos polimerizados foram descritos na literatura [183,184] . O mesmo perfil de estruturas fibrilares também foi observado quando a imagem foi registrada em áreas maiores (10 µm) pela técnica de AFM de contato intermitente (Fig.4.3.9.(A)).…”

Section: Topografia Dos Filmes De Porfirinas Supramolecularesunclassified

Interfaces e dispositivos baseados em porfirinas supramoleculares

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Role of poly-3-methylthiophene structure determined by AFM on the dielectric constant spectra

Cited by 39 publications

References 41 publications

The heterogeneous growth of P(3MeTh)—an ellipsometric study

The heterogeneous growth of P(3MeTh)—an ellipsometric study

Nucleation and Growth Mechanism of Electropolymerization of Methylene Blue: The Effect of Preparation Potential on Poly(methylene blue) Structure

Interfaces e dispositivos baseados em porfirinas supramoleculares

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