Innovative electrochemical sensor based on graphene oxide aerogel wrapped copper centered metal-organic framework to detect catechol

Abstract

• This work constructs a novel electrochemical sensor based on GA/Cu-MOF/GCE for the detection of CT. • GA/Cu-MOF/GCE exhibits a wide linear response and low detection limit toward CT. • GA/Cu-MOF/GCE shows satisfying reproducibility, repeatability and interference. • The encapsulated structure of the modified material improves the stability of the sensor. An innovative electrochemical sensor was developed based on the modification of a glassy carbon electrode (GCE) surface with graphene oxide aerogel (GA) wrapped copper centered metal-organic framework (Cu-MOF) and was applied to the detection of trace catechol (CT). The morphology, structure of GA/Cu-MOF and electrochemical properties of GA/Cu-MOF/GCE were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and electrochemical techniques, respectively. GA/Cu-MOF/GCE has a wide linear range of 12.5–900 μmol∙L −1 ( R 2 = 0.997) and a low limit detection of 1.65 μmol∙L −1 . Compared with the unmodified GCE, GA/Cu-MOF/GCE shows better stability, greater sensitivity and higher repeatability. Importantly, this new modified material was successfully prepared and used for the detection of trace amounts of catechol, providing a new idea for electrochemical detection.