307519.fig.004a
(a)
307519.fig.004b
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307519.fig.004c
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Figure 4: Some representative experimental data from graphene based biosensors. (a) Graphene based glucose biosensor: (i) O2 saturated PBS solution without glucose and (ii) O2 saturated PBS solution with different concentrations of glucose. (b) Graphene based cholesterol biosensor: (i) 0.25 μM cholesterol and (ii) (a-dd) 5 μM, (e-j) 10 μM, and (k-s) 15 μM cholesterol. (c) EDTA-RG/Nafion electrode. (i) Concentrations from 0.20 to 40.00μM (with 1 mM AA in pH) 7.2 PBS. (ii) The relation between the current and concentrations (figures reproduced from [153, 160, 168] with permission from Elsevier and American Chemical Society, respectively).