Figure 6.

Amperometric responses of the NPGF (Nano porous gold film) electrode to successive addition of glucose in a continuously stirred solution of 0.1 M PBS (Phosphate buffer) (pH 7.4) containing (a) 0.1 M Na₂SO₄ at −0.15 V (Reference electrode: SCE, saturated calomel electrode) or (b) 0.1 M NaCl at 0.2 V (Reference electrode: SCE). The upper left insets shows the corresponding calibration curves. The error bars indicate the standard deviation of triplicate determinations. The lower right inset in (b) is a local enlargement marked with a dashed box, showing the lowest detectable concentration of 10 μM. Reproduced with permission from [61]. Copyright 2011, Elsevier.