Facile preparation of electroactive graphene derivative and its potential application in electrochemical detection

Hsiao-Chien Chen, Hung Wei Yang, Kuang Hsuan Yang, Ching Hsiang Chen, Chung Che Hou, Yi Ming Tu

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


A one-step process combining chemical modification and exfoliation for obtaining a graphene (Gs) derivative from pristine graphite is conducted through Friedel–Crafts chemical acylation. This electrophilic substitution reaction results in the carboxylic group (–COOH) of niacin transforming into an acylium ion (–C+[dbnd]O), which is an active species that replaces the sp2 C[sbnd]H of graphite. In addition, highly viscous polyphosphoric acid under mechanical stirring was used to exert strong shear stress on and consequently exfoliate the graphite layers. Raman spectra and absorption spectra demonstrate that the obtained graphene-1-one-pyridine (GsNc) has a highly conjugated structure that facilitates electron transfer in electrochemical processes. This novel GsNc possess high sensitivity toward H2O2 (1157.1 μA mM−1 cm−2) within a linear concentration range of 1 μM to 5 mM. The proposed enzyme-free H2O2 sensor exhibits high selectivity and excellent stability. Furthermore, a choline biosensor is developed for detecting H2O2 released in bioreactions. In this biosensor, positively charged GsNc provides optimal conditions for immobilizing choline oxidase (ChOx) through electrostatic interactions. This immobilization retains 83.4% of ChOx bioactivity and is thus excellent for choline determination. This modified electrode has high potential for application in oxidase-based biosensors.

Original languageEnglish
Pages (from-to)1153-1159
Number of pages7
JournalSensors and Actuators, B: Chemical
Publication statusPublished - 2017 Mar 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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