Figure 8.

Characteristics of single-graphene field effect transistor (SGFET) arrays. (a) Optical microscopy image of the active area of a 4 × 4 graphene SGFET array. (b) Spontaneous oscillatory activity. (c) Signal-to-noise ratio versus frequency curves extracted from the PSD for graphene SGFETs (light red lines) and platinum black electrodes (gray lines). The mean values are depicted by the bold lines. Adapted from [62]. Copyright (2018), with permission from WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.