High-selectivity electrochemical non-enzymatic sensors based on graphene/Pd nanocomposites functionalized with designated ionic liquids

Chueh Han Wang, Cheng Hsien Yang, Jeng-Kuei Chang*

*Corresponding author for this work

Research output: Contribution to journalArticle

25 Scopus citations

Abstract

Nano-sized Pd particles are uniformly dispersed on graphene nanosheets (GNSs) using a supercritical-fluid-assisted deposition technique to increase the electrochemical sensing properties. The incorporation of different kinds of ionic liquid (IL) can increase the electrode sensing current toward different analytes. Butylmethylpyrrolidinium–bis(trifluoromethanesulfonyl)imide (BMP–TFSI) IL is beneficial for glucose detection, whereas the electrode with butylmethylpyrrolidinium–dicyanamide (BMP–DCA) IL shows high sensitivity toward ascorbic acid (AA). The selective detection of glucose or AA from their mixture is for the first time demonstrated using a non-enzymatic electrode with the aid of an IL. Angle-resolved X-ray photoelectron spectroscopy analyses indicate that GNSs can create an aligned cation/anion orientation in the adsorbed IL film, with the anions preferentially occupying the topmost surface. As a result, the electrode sensitivity and selectivity are mainly determined by the IL constituent anions.

Original languageEnglish
Pages (from-to)483-488
Number of pages6
JournalBiosensors and Bioelectronics
Volume89
DOIs
StatePublished - 15 Mar 2017

Keywords

  • Angle-resolved X-ray photoelectron spectroscopy
  • Electrochemical sensing
  • Graphene
  • Ionic liquid
  • Selectivity

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