The illustration shows DNA probes bonded on the layered composite of graphene oxide/graphene, prepared by atomic layer oxidation on bilayer graphene, incorporated into a solution-gated transistor as a miRNA biosensor. By applying an additional back gate to the transistor, the sensitivity and limit of detection can be significantly boosted.
ACS Appl. Electron. Mater. 2021, Volume 3, Issue 10, 4300–4307