Skip to main content
. 2018 Aug 16;23(8):2050. doi: 10.3390/molecules23082050

Figure 4.

Figure 4

Graphene-based FET DNA detectors. (a) DNA transistor: ss-DNA tethering on GO increases the conductivity of the device. Successive hybridization and dehybridization of DNA on the G-DNA device results in completely reversible increase and restoration of conductivity [120]; (b) Transfer characteristics for the graphene transistors before adding DNA, after immobilization with probe DNA, after reaction with complementary or one-base mismatched DNA molecules with the concentration ranging from 0.01 to 500 nM [123]; (c) Schematic representation of the sensor with a reference part, the enlarged area shows the GO deposited on top of the pre-fabricated electrodes [125]; (d) Schematic illustration of the rGO FET biosensor for DNA detection based on PNA-DNA hybridization. The right part shows the typical current signal after the PNA-DNA hybridization [127].