Reference electrodes 2D materials 2 2d material 2 Adhesives 2 Auxiliary electrodes 2 Conducting polymers 2 Costs 2 Cross sensitivity 2 Cyclic voltammetry 2 Diffusion barriers 2 Electrochemical electrodes 2 Electrolytes 2 Fabrication 2 Field effect transistors 2 Gate electrodes 2 Gold deposits 2 Graphene 2 Graphite 2 Graphite electrodes 2 Ion-sensitive field effect transistors 2 Ionic strength 2 Low-costs 2 Multi channel 2 Multichannel graphite electrode 2 Nitrite 2 PEDOT:PSS 2 Performance 2 Poly(3,4-ethylene dioxythiophene): poly(styrene sulphonic acid) 2 Poly(styrene sulfonic acid) 2 Polypropylenes 2