Ionic Liquids with Various Constituent Ions to Optimize Non-Enzymatic Electrochemical Detection Properties of Graphene Electrodes

Jian De Xie*, Chueh Han Wang, Jagabandhu Patra, Purna Chandra Rath, Yasser Ashraf Gandomi, Quanfeng Dong, Jeng Kuei Chang

*Corresponding author for this work

研究成果: Article同行評審

摘要

Palladium (Pd) nanoparticles, ionic liquids (ILs), or both are integrated with graphene sheets to serve as an electrochemical sensor for detecting various bio-species. Ascorbic acid (AA), uric acid (UA), and dopamine (DA) are used as the model analytes. To assess the effects of the constituent ions of ILs on sensing properties, various ILs, namely, EMI-SCN, EMI-DCA, BMP-DCA, BMI-PF6, EMI-NTF2, and BMP-NTF2, are investigated. The results demonstrate that the graphene/IL electrode shows superior detection sensitivity compared to those of the graphene/Pd and graphene/Pd/IL electrodes. Interestingly, the IL anions are found to play a crucial role in sensing performance. Angle-resolved X-ray photoelectron spectroscopy reveals that graphene can create an aligned cation/anion orientation in the adsorbed IL film, with the anions preferentially occupying the topmost surface, thus dominating the interaction with analytes. The graphene/EMI-SCN electrode shows the highest sensitivity among the electrodes, 1.49 μA μM-1 cm-2, and a detection limit of 0.11 μM toward DA. Even with large excesses of AA and UA, the concentration of DA can be effectively detected.

原文English
頁(從 - 到)16233-16240
頁數8
期刊ACS Sustainable Chemistry and Engineering
7
發行號19
DOIs
出版狀態Published - 7 十月 2019

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