Abstract
We report a single-step electrochemical process for the preparation of electrochemically reduced graphene oxide/β-cyclodextrin/cadmium sulfide (ERGO/β-CD/CdS) composite on the screen-printed carbon electrode (SPCE). Thereby, the cyclic voltammetry was employed to simultaneously reduce the GO and deposit the CdS from aqueous solutions. This preparation technique was successfully promoted the ERGO/β-CD/CdS on SPCE. The structure and morphology of ERGO/β-CD/CdS were studied by scanning electron microscope (SEM), energy dispersive X-ray (EDX), Raman spectra, FTIR spectra and electrochemical techniques. These techniques are confirmed that the as-deposited material was CdS and it was strongly anchored on ERGO/β-CD. Herein, the β-CD was used to facilitate the strong binding of CdS on RGO/SPCE. This ERGO/β-CD/CdS/SPCE revealed an excellent electrocatalytic activity toward the detection of nitrite when compared with other modified electrodes. The ERGO/β-CD/CdS/SPCE was showed a well-defined oxidation peak for nitrite and also the amperometric responses indicated the sensor has a wide linear range and very low limit of detection 21 nM. These results suggested that the ERGO/β-CD/CdS would be a promising material for the development of electrochemical nitrite sensor and it was successfully applied to the analysis of nitrite in water samples.
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