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(a) Cyclic voltamogramms of o-ABT grafted electrode surface in PBS (pH 7.4) (1) the first scan, (2) the 10th scan, (3) the 20th scan, (4) the 25th scan. (b) Cyclic voltamogramms recorded in 1 mm hexacyanoferrate/hexacyanoferrate in PBS. (1) Bare gold electrode. (2) O-ABT grafted gold electrode. (3) Anti-Tf/GA/o-ABT/Au electrode surface. The scan rate was 100 mV/s.
