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. 2021 Jan 13;8:582713. doi: 10.3389/fbioe.2020.582713

FIGURE 7.

FIGURE 7

(A) AFM images of the Au electrode surface, (B) Measurement of the impedance of CNT modified-Au electrode at 1 kHz versus days kept in cell culture (RPMI) and ACSF solution (The error bars are for 5 replicate measurements), (C) SEM images of the Au electrode surface, and (D) SEM images of the CNT-modified-Au surface.