Self-Assembly of Graphene-Encapsulated Cu Composites
for Nonenzymatic Glucose Sensing
- Publication date
- Publisher
Abstract
Cu
has recently received great interest as a potential candidate for glucose sensing
to overcome the problems with noble metals. In this work, reduced
graphene oxide-encapsulated Cu nanoparticles (Cu@RGO) have been prepared
via an electrostatic self-assembly method. This core/shell composites
were found to be more stable than conventional Cu-decorated graphene
composites and bare copper nanoparticles in an air atmosphere because
the graphene shell can effectively protect the Cu nanoparticles from
oxidation. In addition, the obtained Cu@RGO composites also showed
an outstanding electrocatalytic activity toward glucose oxidation
with a wide linear detection range of 1 μM to 2 mM, low detection
limit of 0.34 μM (S/N = 3), and a sensitivity of 150 μA mM<sup>–1</sup> cm<sup>–2</sup>. Moreover, Cu@RGO composites exhibited a satisfactory reproducibility,
selectivity, and long effective performance. These excellent properties
indicated that Cu@RGO nanoparticles have great potential application
in glucose detection