Fig. 12
From: Field effect transistor based wearable biosensors for healthcare monitoring
a Schematic of CNT-FETs with the sodium-selective membrane and on-chip reference electrode (reprinted with permission from Ref. [123] Copyright 2021 American Chemical Society). b Functionalization chemistry of Au gates with a polymeric membrane for potassium sensing (reprinted with permission from Ref. [19] Copyright 2018 American Chemical Society). c Potassium ion-selective membrane modified on the GaN surface (reprinted with permission from Ref. [127] Copyright 2019 Wiley). d 3D-EMG-ISFETs with Al2O3 as pH sensing dielectric, functionalized with ion selective membranes for Na+,K+, and Ca2+ sensing (reprinted with permission from Ref. [1] Copyright 2019 American Chemical Society)