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Abstract
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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.
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