Fig. 7: Multichannel pOECT at constant thermodynamic conditions.
From: Reconfiguration of organic electrochemical transistors for high-accuracy potentiometric sensing
a Top: A visual representation of multichannel pOECT where a leakless RE is used as GS and a Pt wire is used as GG. Bottom: A schematic of a multichannel pOECT setup with n channels, each operated at an individual VDS,n but a common VSG. The dashed line represents the high-impedance connection of the potentiostat. b Top: schematic representation of the cell layer grown on top of one pOECT channel before and after trypsin addition. Middle: The applied VSG pulse profile. Bottom: A representative pOECT output in the case of healthy tissue (green) and when the cells are exposed to trypsin (yellow). The measurements were conducted in parallel using multiple pOECT channels. The scale bar in the microscopy images is 100 µm. c Top: The change in the cut-off frequency of four pOECT channels triggered by the trypsin addition (marked with an arrow). Bottom: The average cut-off frequency change (standard deviation from four pOECT channels displayed as shaded area) after compensating for the delay time due to trypsin diffusion.
