Fig. 4
From: Metal oxide modified ZnO nanomaterials for biosensor applications
(reproduced from Ref. [44] with permission, © 2017 John Wiley & Sons)
Electrochemical characterizations. (i) EIS analysis of a bare Ag, b ZnO NRs/Ag, c 1 min Fe2O3-ZnO NRs/Ag, d 2 min Fe2O3–ZnO NRs/Ag, and e 3 min Fe2O3-ZnO NRs/Ag in 5.0 mM [Fe(CN)6]3−/4− solution with 100 mM KCl. (ii) Histogram showing Rct value of fabrication steps. (iii) LSVs without (a) and with 100 µM nitrite at ZnO NRs/Ag (b) and Fe2O3-ZnO NRs/Ag (c) in 0.1 M PBS. (iv) LSVs in 0.1 M PBS containing 100 µM nitrite at Fe2O3-ZnO NRs/Ag in the scan range of 25–200 mV/s. Insets of (i), (iii), and (iv) show the EIS spectrum of bare Ag electrode, nitrite detection schemes, and calibrated curve