Non-enzymatic electrochemical biosensor based on MgO@rGO-MoS2 nanohybrid for phenolic compounds detection

In the present work, efforts have been made to fabricate a non-enzymatic electrochemical biosensor based on MgO nanoparticles modified graphene oxide-molybdenum disulfide (MgO@rGO-MoS2) nanohybrid for ultra-sensitive detection of water-polluting dihydroxy benzene compound. The one-pot hydrothermal method has been used to synthesize MgO@rGO-MoS2 nanohybrid followed by electrophoretic deposition of the nanohybrid onto ITO-coated glass substrate. The excellent conducting and catalytic ability of MoS2 and MgO facilitates the superior electroanalytical ability of fabricated electrodes, as revealed by the electrochemical studies, whereas the non-enzymatic approach boosts the stability and sensitivity of the transducing matrix. The fabricated biosensor exhibits linear response in the 0.1 to 200.0 mu M concentration range for hydroquinone (Hqn) with a detection limit of 0.086 mu M and 0.04 mu A mu M-1 cm(-2) sensitivity. The validation of the biosensor with tap and running river water shows an outstanding recovery rate.