Different steps in electrodeposition of poly(3-methylthiophene) films on platinum electrodes studied by ellipsometry, SEM and AFM techniques

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

doi:10.1016/0379-6779(93)90885-z

Cited by 55 publications

(18 citation statements)

References 21 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: 78%

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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: 78%

“…The results from monitoring the evolution of the polymer film optical parameters have also given sound indications on structural modifications upon thickening [13] which have been further supported by atomic force microscopy investigations [14].…”

Section: Introductionmentioning

confidence: 87%

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

Abrantes¹,

Correia²,

Jin³

2001

Electrochimica Acta

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“…In this way, the distortion of the transient polymerization current by double-layer charging was minimized, and the electropolymerization process was controlled by the electrochemical step rather than by diffusion of the monomers to the electrode surface. [22][23][24][25][26][27][28] Polymerization was achieved in a second step at a constant potential of 1.45 V vs. Ag/ AgNO 3 . Due to the oxidation potentials of the monomers, such a potential was shown to lead to AAT and EDOT copolymerization without inducing overoxidation of the polymer films.…”

mentioning

confidence: 99%

Influence of Chemical and Structural Properties of Functionalized Polythiophene‐Based Layers on Electrochemical Sensing of Atrazine

2011

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Sensitive layers based on conducting homopolymer [poly(3,4-ethylenedioxythiophene), denoted PEDOT] and copolymers [molecularly imprinted and non-imprinted poly(EDOT-co-3-thiophene acetic acid), denoted MICP and NICP, respectively] are electrosynthesized on gold substrates and used for the electrochemical detection of atrazine. These layers are characterized by cyclic voltammetry, ATR-FTIR spectroscopy, optical profilemetry, and AFM microscopy in order to study the effect of the chemical functionalities and of the structural properties of these conducting polymers on the physical chemistry of the interaction with atrazine targets and with the aim to improve the sensitivity of the recognition process. In particular, due to the presence in their backbones of preshaped functionalized cavities which keep the molecular memory of the targets, MICP layers show remarkable sensitivity, a low detection limit (10(-9) mol L(-1)), and a large linear range of detection (10(-8) to 10(-4) mol L(-1)), as demonstrated by square-wave voltammetry.

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“…Electropolymerization continues further until insoluble thiophene oligomers are formed. Adhering to the electrode surface, they give rise to the formation of growing films on the electrodes surfaces [41,42]. The growth of the polymeric film can be studied using chronoamperometry.…”

Section: Mechanisms Of Electrochemical Synthesis Of Conducting Polymementioning

confidence: 99%