Abstract
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 20mM (R=0.999) at 0.65V and from 2 to 10mM (R=0.993) at −0.2V, respectively. The sensitivity of the sensor determined from the slopes is 49.5μAmM−1cm−2 at 0.65V.
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