A new preparation of Au nanoplates and their application for glucose sensing

The present communication demonstrates a relatively green preparative route toward Au nanoplates in aqueous solution at room temperature with the use of tannic acid (TA), which is an environmentally friendly, soluble polyphenol, as a reducing agent. Such Au nanoplates exhibit notable catalytic performance toward the oxidation and reduction of H2O2. A glucose biosensor was further fabricated by immobilizing glucose oxidase (GOD) into chitosan-Au nanoplate composites film on the surface of glassy carbon electrode (GCE). This sensor exhibits good response to glucose, and the linear response range is estimated to be from 2 to 20 mM (R = 0.999) at 0.65 V and from 2 to 10 mM (R = 0.993) at −0.2 V, respectively. The sensitivity of the sensor determined from the slopes is 49.5 μA mM−1 cm−2 at 0.65 V.