Electrochemical Sensing Performance of Graphene/Palladium/Ionic liquid Nanocompositie Electrodes

• Main Authors: Chueh-Han Wang, 王覺漢
• Other Authors: Jeng-Kuei Chang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/47056651713935006026

碩士 === 國立中央大學 === 材料科學與工程研究所 === 100 === In this study, we use graphen-based and multiwall carbon nanotubes-based(MWCNT) materials as electrochemical sensing electrode to detect ascorbic acid(AA), dopamine (DA) and uric acid (UA). In order to enhance sensitivity and selective, nano-sized Pd catalyst particles are uniformly dispersed on both the carbon supports using a supercritical fluid deposition techniquein in which the MWCNT/Pd electrode shows higher detection current than that of the Graphene/Pd electrode. Besides Pd NPs, IL also utilized for application, the detection sensitivity of the Graphene/IL electrode is significantly promoted and noticeably outperforms that of the MWCNT/IL. Six different ILs are investigated in this research, including 1-ethyl-3-methylimidazolium thiocyanate (EMI-SCN), 1-butyl-1-methylpyrrolidinium bis (trifluoromethyl) sulfonyl imide (BMP-NTf2), 1-butyl-1-methylpyrroli dinium dicyanamide (BMP-DCA), 1-butyl-3-methylimidazolium hexafluorophosphate (BMI-PF6 ), 1-ethyl-3-methylimidazolium bis(trifluoromethyl)sulfonyl imide (EMI-NTf2) and 1-ethyl-3-methylimidazolium dicyanamide (EMI-DCA). Both Pd NPs and IL could improve sensing performance, nevertheless, mixture of Graphene/Pd/IL electrode is not as good as graphene/IL electrode. The experimental result elucidated the cation dominate the sensing behavior as SCN- > DCA- > PF6- > NTF2-. In the case of glucose, graphene cannot detect glucose in spite of IL existence, while Pd NPs supports act as catalyst can enhance performance. Especially Graphene/Pd/IL combination could improve sensing performance, the sensing behavior that also effected by cation, there are NTF2- > PF6- > DCA- > SCN-. For simultaneous detection different analyte, the satisfactory selectivity and sensitivity can obtain by choosing suitable NPs or ILs that performs great potential in electrochemical sensing.