Three-dimensional Graphene FETs for pH Detection

Three-dimensional (3D) graphene field-effect transistors (GFETs) with a microtubular structure were reported in this paper. The 3D GFET can be used to determine the pH value of analytes by directly measuring the Dirac point voltage. Experimental results demonstrated that the 3D GFET sensor has a sensitivity of 228 mV/pH and high linearity ( R ² = 0.9796). Considering that graphene can be functionalized by a lot of molecules, we expected to further develop 3D GFET sensors for more sensitive and specific biological and chemical detections.