Faradaic effects in all-organic transistors

Abstract

Electrochemical ͑Faradaic͒ effects play an important role in the unusual field-effect phenomenon observed in an all-organic transistor-type device that use films of doped electronic polymers, such as polyaniline ͑emeraldine-HCl͒ and poly-3,4-ethylenedioxythiophene polystyrene sulfonate, as the channel and gate. Small leakage currents through the dielectric are sufficient to affect reversible redox reactions in the polymer film in the active region of the device, i.e., where the channel and gate regions overlap. In the case of polyaniline, these redox reactions are accompanied by color changes corresponding to the different oxidation states of polyaniline that can be visually observed and also spectroscopically monitored.

Thiol–Ene Click Chemistry

“…Since 2000, hundreds of articles and patent applications, the majority dealing with Norland Optics photoocurable thiol–ene systems, have appeared in a wide array of journals. The applications of this technology are far too extensive to cover in detail in this Review, but apart from those already presented, applications extend to dielectric layers,216, 217 flexible display components,218–225 photonic crystals,226, 227 molding/stamping/imprinting,228–234 grating components,235, 236 lens components,237–240 prism beam stearers,241 optical waveguides,242–245 lithography,246, 247 patterning,248 waveguide cladding,249 nanofiber high‐oxygen‐barrier networks,250 nanopillars,251 microbridges,252 microfluidic devices,253 and plasmonic crystals sensors 254. Probably the largest singe use of Norland thiol–ene‐based photocurable systems has been in the fabrication of PDLCs and HPDLCs and related liquid‐crystalline optical devices 255–291.…”

Faradaic effects in electrochemically gated graphene sensors in the presence of redox active molecules

“…If redox active molecules, however, are used as receptors or targeted as analytes in electrochemically gated GFET sensors, this electrochemical activity will be detrimental to the sensor response. The same may apply for molecules deposited on top of graphene as anchor layers, like polyaniline-or polypyrrole-derivatives, which occupy varying oxidation states based on the solution pH when undergoing electrochemical rearrangement reactions [9,62,63]. On largearea graphene devices, these reactions could result in large currents leading to a Faradaic effect.…”

Thiol‐En‐Klickchemie

“…Eine detaillierte Zusammenfassung dieser Ergebnisse würde den Rahmen dieses Aufsatzes übersteigen. Einige besonders bemerkenswerte Anwendungen der Thiol‐En‐Klickchemie finden sich bei der Herstellung von dielektrischen Schichten,216, 217 flexiblen Displays218–225 und photonischen Kristallen,226, 227 bei Guss‐/Stempel‐/Druckverfahren,228–234 bei der Herstellung von Beugungsgittern,235, 236 optischen Linsen,237–240 Prismen241 und Wellenleitern,242–245 in der Lithographie,246, 247 der Musterbildung248 sowie bei der Herstellung von Wellenleiterverkleidungen,249 Nanofasernetzwerken mit hoher Sauerstoffbarriere,250 Nanosäulen,251 Mikrobrücken,252 mikrofluidischen Bauelemente253 und Sensoren auf der Basis plasmonischer Kristalle 254. Die vermutlich häufigste Verwendung der Norland’schen photohärtenden Thiol‐En‐Systeme ist die Herstellung von PDLCs, HPDLCs und verwandten flüssigkristallinen optischen Bauelementen 255–291.…”