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Fig. 1 (A) LSVs of bare gold electrodes in a 0.3 M oxalic acid solution (black line) and 1.0 M phosphate buffer (pH 7.0) containing 0.3 M glucose (gray line) at 0°C and v = 0.1 mV s“ under stirring. (B) Top-view SEM image of a gold foil anodized in a 0.3 M oxalic acid solution. (C) Top-view SEM image of a gold foil anodized in 1.0 M phosphate buffer (pH 7.0) containing 0.3 M glucose. (D) Top- view SEM image of a BOD-adsorbed gold foil anodized in a 0.3 M oxalic acid aqueous solution. (E) Top-view SEM image of a POD-immobilized gold foil anodized in a 0.3 M oxalic acid aqueous solution. The scale bars in each panel show 100 nm.

Figure 1 (A) LSVs of bare gold electrodes in a 0.3 M oxalic acid solution (black line) and 1.0 M phosphate buffer (pH 7.0) containing 0.3 M glucose (gray line) at 0°C and v = 0.1 mV s“ under stirring. (B) Top-view SEM image of a gold foil anodized in a 0.3 M oxalic acid solution. (C) Top-view SEM image of a gold foil anodized in 1.0 M phosphate buffer (pH 7.0) containing 0.3 M glucose. (D) Top- view SEM image of a BOD-adsorbed gold foil anodized in a 0.3 M oxalic acid aqueous solution. (E) Top-view SEM image of a POD-immobilized gold foil anodized in a 0.3 M oxalic acid aqueous solution. The scale bars in each panel show 100 nm.

Related Figures (2)

Fig. 2. (A) Adsorption spectra of a 13 uM HAuCl, solution before reduction (dotted line), and after addition of 0.28 M oxalic acid (solid line) and 0.28 M glucose in 0.9 M phosphate buffer (pH 7.0) (dashed line). (B) Photographic image of gold plating on a plastic Eppendorf tube after reduction of an HAuClh, solution by oxalic acid.
Fig. 2. (A) Adsorption spectra of a 13 uM HAuCl, solution before reduction (dotted line), and after addition of 0.28 M oxalic acid (solid line) and 0.28 M glucose in 0.9 M phosphate buffer (pH 7.0) (dashed line). (B) Photographic image of gold plating on a plastic Eppendorf tube after reduction of an HAuClh, solution by oxalic acid.
Fig. 3 (A) RDCVs for the reduction of O2 at the BOD-modified porous gold electrode anodized in a 0.3 M oxalic acid solution (black solid line) and 1.0 M phosphate buffer (pH 7.0) containing 0.3 M glucose (gray solid line). Measurements were conducted in 0.2 M citrate buffer (pH 5.0) under O>-saturated conditions at 25°C, @ = 4000 rpm, and v= 10 mV s™. Black dotted and gray dashed lines represent CVs under Ar-saturated and quiescent conditions, respectively. Inset shows CVs under Ar-saturated conditions in 0.2 M citrate buffer (pH 5.0, gray solid line) and 0.1 M phosphate buffer (pH 7.0, black solid line), respectively, at v=5 mV s!. (B) RDCVs for the reduction of HO; at the POD-modified porous gold electrode anodized in a 0.3 M oxalic acid solution (black solid line) and 1.0M phosphate buffer (pH 7.0) containing 0.3 M glucose (gray solid line). Measurements were conducted in 0.1 M phosphate buffer (pH 7.0) containing 0.2 mM H2O, under air-saturated conditions at 25°C, @ = 4000 rpm, and v= 10 mV s". Black dotted and gray dashed lines represent CVs in the absence of the substrate, respectively.
Fig. 3 (A) RDCVs for the reduction of O2 at the BOD-modified porous gold electrode anodized in a 0.3 M oxalic acid solution (black solid line) and 1.0 M phosphate buffer (pH 7.0) containing 0.3 M glucose (gray solid line). Measurements were conducted in 0.2 M citrate buffer (pH 5.0) under O>-saturated conditions at 25°C, @ = 4000 rpm, and v= 10 mV s™. Black dotted and gray dashed lines represent CVs under Ar-saturated and quiescent conditions, respectively. Inset shows CVs under Ar-saturated conditions in 0.2 M citrate buffer (pH 5.0, gray solid line) and 0.1 M phosphate buffer (pH 7.0, black solid line), respectively, at v=5 mV s!. (B) RDCVs for the reduction of HO; at the POD-modified porous gold electrode anodized in a 0.3 M oxalic acid solution (black solid line) and 1.0M phosphate buffer (pH 7.0) containing 0.3 M glucose (gray solid line). Measurements were conducted in 0.1 M phosphate buffer (pH 7.0) containing 0.2 mM H2O, under air-saturated conditions at 25°C, @ = 4000 rpm, and v= 10 mV s". Black dotted and gray dashed lines represent CVs in the absence of the substrate, respectively.
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