Field effect transistors Extended gate field effect transistor (EGFET) 5 Thin films 5 Titanium dioxide 5 pH sensors 5 Graphene 4 Performance 4 Sensing membranes 4 pH effects 4 Chemical vapor deposition 3 Field-effect transistor 3 Oxide films 3 Silicon nanowire field-effect transistors 3 Thermoelectric equipment 3 Thin film circuits 3 Zinc oxide 3 pH 3 2D materials 2 2d material 2 Biosensors 2 Conducting polymers 2 Cross sensitivity 2 Deposition 2 Diffusion barriers 2 Electrochemical electrodes 2 Electrolytes 2 Gate electrodes 2 Gold deposits 2 Graphene transistors 2 II-VI semiconductors 2