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(a) and (b) SEM image and size distribution histogram of as-prepared Ag NWs-graphene hybrids using one-step process. The average length of Ag NWs is ∼27 μm with a standard deviation of 3 μm. The Ag NWs and graphene is tightly contacting each other, forming a continuous network. (c) and (d) SEM image and size distribution histogram of as-prepared Ag NWs synthesized without the addition of GO. The average length of Ag NWs is ∼3 μm. Moreover, the Ag NWs is fraught with numerous random Ag nanoparticles.
(a) UV-Visible absorption spectra of GO (in blue), Ag NWs (in red), Ag NWs-graphene (in black). (b) Raman spectra of GO (in blue) and Ag NWs-graphene (in black) showing the successful reduction of GO into graphene.
(a) The Nyquist plot of various electrochemical electrodes in the background solution of equimolar Fe(CN)6 3-/Fe(CN)6 4-, where X (Z′) and Y (Z″) coordinates correspond to the real and imaginary impedance of electrodes, respectively. The inset is the equivalent electrical circuit fitting the Nyquist plot. (b) The electrocatalytic responses of Ag NWs-graphene and Ag NWs towards the electrocatalytic reduction of H2O2 (1.0 mM) in 0.2 M PBS (pH 7.0).
(a) Typical current-time responses of Ag NWs (in red) and Ag NWs-graphene/GCE (in black) to successive injection of H2O2 into the stirring 0.2 M PBS (pH 7.0). (b)The calibration curves showing the current responses to different H2O2 concentration at a constant applied potential of −0.500 V for Ag NWs (red square) and Ag NWs-graphene electrode (black circle). (c) Selectivity measurement. The baseline current response towards a H2O2 (0.5 mM) was ∼23.0 μA at a working potential of −0.500 V. When 0.2 mM AA was abruptly added into the solution, there was no obvious change in the current, revealing that the sensor is not responsive to the AA.
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