Electrochemical Sensor for o‐Nitrophenol Based on <i>β</i>‐Cyclodextrin Functionalized Graphene Nanosheets

Abstract

An electrochemical sensor for the quantification of o‐nitrophenol (o‐NP) has been developed based on the β ‐cyclodextrin functionalized graphene nanosheets modified glassy carbon electrode (CD‐GNs/GCE). The results indicated that CD‐GNs showed good electrochemical behavior to the redox of o‐NP which is attributed to the combination of the excellent properties of graphene and cyclodextrin. The peak currents possess a linear relationship with the concentration of o‐NP in the range of 5–400 μ M. The detection limit of o‐NP reached to 0.3 μ M on the basis of the signal‐to‐noise characteristics (S/N = 3). The peak potentials for the reversible redox waves are not affected by other nitrophenol isomers (m, p‐NP), illustrating good selectivity. Furthermore, the developed electrochemical sensor exhibited good stability and reproducibility for the detection of o‐NP and could be used to determine o‐NP in real water sample.