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Nanostructured silver nanowires-graphene hybrids for enhanced electrochemical detection of hydrogen peroxide
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10.1063/1.4807921
/content/aip/journal/apl/102/21/10.1063/1.4807921
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/21/10.1063/1.4807921
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Figures

Image of FIG. 1.
FIG. 1.

(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 m with a standard deviation of 3 m. 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 m. Moreover, the Ag NWs is fraught with numerous random Ag nanoparticles.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(a) The Nyquist plot of various electrochemical electrodes in the background solution of equimolar Fe(CN) /Fe(CN) , 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 HO (1.0 mM) in 0.2 M PBS (pH 7.0).

Image of FIG. 4.
FIG. 4.

(a) Typical current-time responses of Ag NWs (in red) and Ag NWs-graphene/GCE (in black) to successive injection of HO into the stirring 0.2 M PBS (pH 7.0). (b)The calibration curves showing the current responses to different HO 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 HO (0.5 mM) was ∼23.0 A 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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/content/aip/journal/apl/102/21/10.1063/1.4807921
2013-05-28
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanostructured silver nanowires-graphene hybrids for enhanced electrochemical detection of hydrogen peroxide
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/21/10.1063/1.4807921
10.1063/1.4807921
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