Fig. 4. (A) The I–V curves of the nanochannel biosensor bound with Pb2+, measured at a series of concentrations (0.01 μM to 100 μM). (B) The linear relationship between the I − I0/I0 value and the concentration of Pb2+ (0.01 μM to 0.16 μM and 10 μM to 100 μM). (C) The linear relationship between the I − I0/I0 value of the Pb2+ concentration from 0.01 μM to 0.16 μM. (D) The linear relationship between the I − I0/I0 value of the Pb2+ concentration from 10 μM to 100 μM.
