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Procedure of piezoelectric sensor based on AuNPs-mediated enzyme-assisted signal amplification. (A) SEM images of electrodes promoting the growth of AuNPs in HAuCl4 and NADH solutions containing target DNA and Exo III for (Ba) 0 min, (b) 10 min, (c) 30 min and (d) blank control. Reproduced from (37), Copyright (2022), with permission from Elsevier. AuNPs, gold nanoparticles.
