A combined electrochemical quartz-crystal microbalance probe beam deflection (EQCM-PBD) study of solvent and ion transfers at a poly[Ni(saltMe)]: modified elecrode during redox switching

The oxidative polymerization of the complex2,3-dimelhyl-N,N-bis( salicylidene)butane-2,3-diaminatonickel( n), [Ni(saltMe)], was monitored by the electrochemical quartz microbalance (EQCM) and crystal impedance techniques. Polymerisation efficiency was maintained throughout deposition of a film, which behaved rigidly, on the electrode

Electrochemical behavior of a new precursor for the design of poly[Ni(salen)]-based modified electrodes

Wedescribe the potentiodynamic preparation and subsequent characterization of poly[Ni(3-MeOsaltMe)] films (surface concentration, 3 < ¡/nmol cm-2 < 350) in acetonitrile media. Coulometric and gravimetric (electrochemical quartz crystal microbalance, EQCM) data allow one to monitor the deposition process and show that the resultant films are physically and chemically stable

In-situ quartz microbalance study of the electrosynthesis of poly(3-methylthiophene)

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Electrogravimetric detection of DNA hybridization on polypyrrole copolymer

The immobilization of an oligonucleotide via a copolymerisation with a pyrrole monomer onto a Pt surface has been realized on a quartz crystal microbalance (QCM). The efficiency of this biosensor has been evaluated through the hybridization with different targets. Hybridization and adsorption responses were monitored in-situ by QCM frequency change

Étude du transport ionique dans le polyéthylcarbazole par microbalance à quartz et par effet mirage

On a comparé pour le polyéthylcarbazole en milieu acide perchlorique 5M, la réponse de la microbalance à quartz et celle de l'effet mirage en régime dynamique.Dans la phase de réduction, seule la sortie des ions perchlorate intervient alors que dans la phase d'oxydation il y a simultanément sortie de protons et entrée d'anions. Par impédance massique en régime quasi-stationnaire on montre que seuls les anions interviennent. Ces résultats sont expliqués par les différences de conduction ionique du film entre les états oxydés ou réduits

Ionic transport in poly(N-ethylcarbazole) films, investigated by quartz crystal microbalance and mirage effect techniques

International audienceIonic insertion or removal from a poly (N-ethylcarbazole) (PECBZ) film modified electrode upon doping/dedoping in perchloric acid was studied by the mirage effect and quartz crystal microbalance (QCMB) techniques. The experimental mirage signal while cycling the potential was compared to the calculated signal based on an exclusive anion exchange limited by diffusion. The mass-charge relation from the QCMB was either obtained during cycling voltammetry or from the mass-charge transfer function measured with a low-level signal. Upon anodic scan, the mass increase is delayed with respect to the charge increase and the measured mirage signal is lower than the calculated one. Upon cathodic scan, the mass-charge relation is linear with a slope of 120 g mol−1 faraday−1, the measured and calculated mirage signals being identical. It is proposed that, starting from a cathodic potential, a conductor-insulator boundary moves from the metal to the solution. A large expulsion of protons and a weak insertion of counter-ions result from a transport control by electric migration in the insulator layer where the transference number of protons is much larger than that of anions. During the cathodic scan, the side of the film against the solution remains conducting and anions are easily exchanged with the solution