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The effects of ionic liquid on the electrochemical sensing performance of graphene- and carbon nanotube-based electrodes.

Research paper by Chueh-Han CH Wang, Cheng-Hung CH Wu, Jia-Wun JW Wu, Ming-Tsung MT Lee, Jeng-Kuei JK Chang, Ming-Der MD Ger, Chia-Liang CL Sun

Indexed on: 23 Nov '12Published on: 23 Nov '12Published in: Analyst



Abstract

The electrochemical sensing properties of graphene-based and carbon nanotube (CNT)-based electrodes towards ascorbic acid, dopamine, uric acid, and glucose are systematically compared. Nano-sized Pd catalyst particles are uniformly dispersed on both carbon supports using a supercritical fluid deposition technique to increase the sensing performance. The CNT/Pd electrode shows higher detection current than that of the graphene/Pd electrode, which is attributed to the three-dimensional architecture interwoven by the CNTs that creates a larger number of reaction sites. With the incorporation of ionic liquid (IL), the detection sensitivity of the IL/graphene/Pd electrode significantly increases, becoming noticeably higher than that of the IL/CNT/Pd counterpart. The synergistic interactions between graphene and IL that lead to the superior sensing performance are demonstrated and discussed.