A Novel Graphene-Grafted Gold Nanoparticles Composite for Highly Sensitive Electrochemical Biosensing

The use of affordable amendments required increasing the sensitivity and functionality of electrochemical devices is still challenging. Novel scalable, gold nanoparticles-grafted nitrogen-doped graphene nanostructured polyaniline nanocomposites were stupendously developed in this paper. The charge transfer resistance was dramatically decreased from 11000 Ω (for bare fluorine doped tin oxide electrode) down to 115 Ω (for the nanocomposite-modified electrode). The present nanocomposites provided a superb opportunity for the design of electrochemical biosensors with extraordinary performance via enhanced analyte sensitivity for the detection of ascorbic acid (0.640 mM detection limit at signal to noise ratio = 3, and two linear ranges of 0.96-4.66 and 5.06-9.86 mM with the sensitivity of 10.44 and 28.91 μA . mM
^-1
. cm
^-2
, respectively), and high selectivity over electroactive components interfering species, commonly found in real serum samples.