Graphene-based nanocomposite films have recently been used as an effective sensing platform for the development of electrochemical sensors and biosensors because of their unique facile surface modification characteristics and high charge mobility.

The researchers’ new concept combines the advantages carbon nanotubes and reduced graphene oxide together with electrochemical bursting of magnetic gold nanoparticles into a large number of metal ions.

High sensitivity was achieved by precisely designing the nanohybrid and correlating the available metal ions with analyte concentration. The researchers used tiny magnetic particles encapsulated in inert coating of silicon dioxide to make core-shell nanostructures with favorable magnetic properties of metallic iron while preventing them from oxidation or significant degradation. They were then coated with gold because of its chemical inertness and biocompatibility.

This novel immune-detection platform shows potential for rapid and sensitive screening of environmental pollutants or toxins in samples. Researchers reported the ultrahigh sensitivity of this method for a new generation of herbicide diuron and its analogues up to sub-picomolar concentration in standard water samples. The process also proved to be efficient and cost-effective: tens of thousands of screen-printed electrodes can be manufactured quite readily with low cost for such hybrid assay.

This story is reprinted from material from
McCormick School of Engineering, with editorial changes made by Materials Today. The views expressed in this article do not necessarily represent those of Elsevier. Link to original source.