Figure 7 .

Equivalent circuits of the GO-film-functionalized IDE. (a) Semicircle-type impedance associated with the bulk impedance of GO films and (b) both semicircle-type impedance associated with the bulk impedance of GO films and straight line-type impedance (i.e., Warburg impedance) associated with GO-electrode interface.

Yao et al. Nanoscale Research Letters 2012 7:363   doi:10.1186/1556-276X-7-363
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