Facile Fabrication of Graphene-Supported Pt Electrochemical Sensor for Determination of Caffeine
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Because elevated levels of caffeine intake can cause many health complications, it is necessary to develop an accurate, simple, rapid, and cost-effective methodology to quantify caffeine in commonly consumed products. This article discusses electrochemical methods to synthesize platinum-graphene hybrid nanosheets (Pt-GR), and how these methods can be utilized to create a new modified electrode, the platinum-graphene nanohybrid glass carbon electrode (Pt-GR/GCE). The electrochemical behavior of caffeine on Pt-GR/GCE was studied by differential pulse voltammetry (DPV). The results showed that a sensitive oxidation peak was observed at 1.336 V in 0.01 mol L−1 H2SO4 buffer solution, indicating that the Pt-GR/GCE exhibited a good electrooxidation activity towards caffeine. The detection limit is 1.129 × 10−7 mol L−1. The modified electrode was applied to the determination of caffeine in real samples with satisfactory electrocatalytic results.
KeywordsCaffeine Graphene Pt Modified electrode Electrocatalysis
This work was supported by the National Natural Science Foundation of China (No. 21175086) and the Key Research and Development Projects of Shanxi Province (No. 201803D31070).
Compliance with Ethical Standards
Conflict of Interest
The authors declare that they have no conflict of interest.
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