A novel ultrasensitive electrochemical quercetin sensor based on MoS2 - carbon nanotube @ graphene oxide nanoribbons / HS-cyclodextrin / graphene quantum dots composite film

An electrochemical quercetin (Que) sensor based on molybdenum disulfide (MoS2 ) - carbon nanotube @ graphene oxide nanoribbons (CNTs@GONRs) / thiol-beta-cyclodextrin (HS-CD) / aminated graphene quantum dots (N-GQDs) was constructed. Portions of mull-walled carbon nanotubes (MWCNTs) were unzipped to form CNTs@GONRs, and MoS2 was successfully grown on it to form composites (MoS2-CNTs@GONRs). The obtained MoS2-CNTs@GONRs / HS-CD / GQDs nanocomposite was characterized by X-ray diffraction spectroscopy (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and Fourier transform infrared spectroscopy (FTIR). Under optimized conditions, the proposed sensor had an excellent detection performance for Que with a wide linear range from 2.0 x 10(-9) - 1.6 x 10(-6) M and a lower limit of detection (LOD) of 8.2 x 10(-10) M. The sensor also exhibited satisfactory stability and accuracy for Que detection in actual samples (juice and honey). The present work provided a novel method for the detection of Que and also proposed a new type of electrochemical sensing material.