Preparation of reduced graphene quantum dots for electrocatalytic applications

In this study reduced graphene quantum dots (rGQD) were electrodeposited on the surface of pencil lead electrode for electrocatalytic applications. Scanning electron microscopy, electro- chemical impedance spectroscopy and cyclic voltammetry techniques were used for characterizing the prepared electrodes. The prepared electrode was studied in detail in Potassium hexacyanoferrate(III) solution and active surface area was calculated and compared with other electrodes. The developed electrochemical sensor responds efficiently to Adenine over the concentration range 0.2-120 μM with the detection limit of 112 nM and suitable sensitivity. High performance of the developed sensor is attributed to the large surface-to-volume ratio, excellent biocompatibility of rGQD and abundance of hydrophilic edges as well as hydrophobic plane in rGQD which enhances electrocatalytic performance of the modified electrode.