Enhanced TA determination on 3D flower-like ZnO-Ptnanocomposites under ultraviolet light illumination
Shumin Li a, Ke Zhang a, Jin Wang a, Bo Yan a, Caiqin Wang b,∗（王彩琴）, ZhipingXionga, Hui Xu a,Yukou Du a,∗（杜玉扣）
a College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
b Chemistry Department, University of Toronto, Toronto, M5S3H4, Canada
Sensors and Actuators B, 2017, 252, 717--724
Flower-like ZnO-Pt materials with three-dimensional architectures weresynthesized by one-pot method,and a novel tannic acid (TA) analytical method based on flower-like ZnO-Pt modified glassy carbon electrode (ZnO-Pt/GCE) was also developed. Due to the introduction of metal Pt on ZnO, the as-preparedelectrode exhibited good conductivity and gave rise to a significant increase in the photocurrent density under UV light illumination, confirming an enhanced charge transfer speed and a well combinationbetween exited electron-hole pairs of ZnO. For the analysis of TA, differential pulse voltammetry (DPV)was applied to evaluate the photoelectrochemical performance on ZnO-Pt/GCE, and a wide linear range of0.04–72.34 M with a low detection limit of 0.02 M (at S/N = 3) was obtained ultimately. The oxidationmechanism of tannic acid in different routes was also proposed and discussed. Moreover, the prepared electrode displayed high stability and selectivity toward the determination of tannic acid. These excellentresults presented here make the ultraviolet assisted electrochemical determination a promising methodin sensing.
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