Reduced Carboxylate Graphene Oxide based Field Effect Transistor as Pb²⁺ Aptamer Sensor.

In Figure 5 B, for apta-pGp-FETs, because of the polymer residue on the channel film, no sensitivity can be obtained; for rGO, there is an increasing trend from 0 to 1 ppb (green arrow in Figure 5 B), but the amplitude is dramatically lower than rGO-COOH, that is just in agreement with the few LSA molecule anchored on it, which is evidenced by P2p core spectra, in Figure 3 E.

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