利用離子液體提升鈀金／石墨烯複合電極葡萄糖感測靈敏度之研究

Using Ionic Liquid to Improve Glucose Sensing Performance of PdAu/graphene Nanocomposite Electrodes

本研究於超臨界二氧化碳環境下合成鈀金／石墨烯（PdAu/graphene）奈米複合材料，並應用於非酵素型葡萄糖感測器。藉由超臨界流體的低黏滯性及高擴散性等特性，能將鈀金奈米顆粒均勻地被覆在石墨烯上，所合成的鈀金奈米顆粒約為5 nm。研究中也使用超臨界流體技術合成金／石墨烯（Au/graphene）及鈀/石墨烯（Pd/graphene）作為對照組。作為偵測葡萄糖的電極，鈀金／石墨烯有低於金／石墨烯的氧化電位，高於鈀/石墨烯的氧化電流。為了進一步提升感測性質，另外設計添加離子液體1-Butyl-1-Methylpyrrolidinium Bis（trifluoromethylsulfonyl） imide （BMP-NTF2）於感測電極中，使其感測靈敏度獲得顯著提升。

In this study, we synthesize PdAu/graphene nanocomposites by supercritical carbon dioxide (scCO2) for non-enzymatic glucose detection. With the aid of scCO2, which has gas-like diffusivity, extremely low viscosity, and near-zero surface tension, the synthesized nano-sized PdAu particles (approximately 5 nm in diameter) are uniformly distributed on graphene. For comparison, Pd/graphene and Au/graphene are both synthesized using the same process. The PdAu/graphene electrode shows higher current density than Pd/graphene and lower oxidation potential than Au/graphene in detecting glucose. With the incorporation of 1-Butyl-1-Methylpyrrolidinium Bis(trifluoromethylsulfonyl)imide (BMP-NTf2) ionic liquid in PdAu/graphene electrode, the detection sensitivity significantly improved.