http://www.cnr.it/ontology/cnr/individuo/prodotto/ID208174

Organic electrochemical transistors monitoring micelle formation (Articolo in rivista)

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Organic electrochemical transistors monitoring micelle formation (Articolo in rivista) (literal)

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Giuseppe Tarabella a, Gaurav Nanda b, Marco Villani a, Nicola Coppedè a, Roberto Mosca a, George G. Malliaras c, Clara Santato b, Salvatore Iannotta a, Fabio Cicoira d (2012)
Organic electrochemical transistors monitoring micelle formation
in Chemical science (Camb. 2010. Print); The Royal Society of Chemistry, Cambridge (Regno Unito)
(literal)

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Giuseppe Tarabella a, Gaurav Nanda b, Marco Villani a, Nicola Coppedè a, Roberto Mosca a, George G. Malliaras c, Clara Santato b, Salvatore Iannotta a, Fabio Cicoira d (literal)

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a CNR-IMEM, Institute of Materials for Electronics and Magnetism, Parco Area delle Scienze 37/A, 43124, Parma, Italy; b Department of Engineering Physics, École Polytechnique de Montréal, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada; c Department of Bioelectronics, École Nationale Supérieure des Mines, CMP-EMSE, MOC, 13541, Gardanne, France; d Department of Chemical Engineering, École Polytechnique de Montréal, 2500 chemin de Polytechnique, Montréal, Québec H3T 1J4, Canada (literal)

Titolo

Abstract

Organic electrochemical transistors (OECTs) exploit electrolyte gating to achieve the transduction of ionic currents. Therefore, they are ideally suitable to sense different chemo/bio species dissolved in the electrolyte. Current modulation in OECTs relies on doping or dedoping of the OECT channel by electrolyte ions. Nevertheless the role played by the specific physicochemical properties of an electrolyte on OECT operation is largely unknown. Here we investigate OECTs, making use of aqueous solutions of the micelle-forming cationic surfactant cetyltrimethylammonium bromide (CTAB) as the electrolyte. Micelle-forming salts are remarkable model systems to study the doping and dedoping mechanism of OECTs, because the aggregation of dissociated ions into micelles at the critical micelle concentration permits to modify the size and the type of the species that dope or dedope the OECT channel in situ. The current modulation of OECTs using a CTAB electrolyte shows a marked increase close to the critical micellar concentration. The measurement of the transistor's drain current as a function of CTAB concentration provides a simple, fast method to detect the formation of micelles from dissociated ions. (literal)

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