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Cortical neural prostheses require chronically implanted small-area microelectrode arrays that simultaneously record and stimulate neural activity. It is necessary to develop new materials with low interface impedance and large charge transfer capacity for this application and we explore the use of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) for the same. We subjected PEDOT coated...
The capacitance spectra of a metal-insulator-semiconductor (MIS) structure are discussed in terms of parasitic effects, caused by lateral currents along the insulator/ semiconductor interface. The organic materials Poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) and poly(3-hexylthiophene) (P3HT) were used for insulator and semiconductor, respectively. Capacitance-frequency (C-f) measurements...
The efficacy of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) coatings was tested on microelectrodes for neural recording and stimulation. Invitro tests revealed that PEDOT coated electrodes were capable of injecting 15 times the charge of Platinum Iridium (PtIr) electrodes and Iridium Oxide (IrOx) coated electrodes when using constant current stimulation at zero voltage bias. Furthermore,...
Three different methods of using protein-based capacitive biosensors for the detection of heavy-metal ions are presented. The metal-binding proteins SmtA, S100A12, MerP and four modified MerPs were immobilised as the bio-recognition element on self-assembled monolayer-modified gold electrodes. Capacitance was measured using potential square step or electrical impedance spectroscopy. The protein-metal...
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