
361Bioelectronics on Graphene
measurements were made in dry-nitrogen conditions, they were effective in produc-
ing the negative-charge gating. These results further elucidate the high sensitivity of
graphene biosensors, which function effectively as a label-free DNA detector and a
molecular transistor.
In another study, Chen and Li developed a pristine graphene-based DNA detector.
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Here, DNA is adsorbed on graphene device, which causes a shift of the Dirac point toward
lower voltages (Figure 14.10). Upon interfacing the G–DNA device with complementary
DNA, the resultant hybridization causes a further reduction in the Dirac point. Single pair ...