Abstract
A new nanocomposite based on ZnCdTe semiconductor nanocrystals (NCs) synthesized in situ on reduced graphene oxide (rGO) was obtained. The heterostructure was characterized using UV-Vis emission and absorption spectroscopies, which provided evidences of the growth of the nanocrystals onto the rGO matrix. To evaluate the electrochemical performance, carbon paste electrodes modified with the nanocomposite (QD-rGO/CPE) were prepared, showing high sensitivity in the electroanalytical detection of the pesticide carbendazim. Under optimal operational conditions a calibration curve was constructed with a linear behavior in the range of 9.98 × 10-8 to 1.18 × 10-5 mol L-1, with a correlation coefficient of 0.997. The limit of detection (LOD) and the limit of quantification (LOQ) for carbendazim were 9.16 × 10-8 and 2.78 × 10-7 mol L-1, respectively. The electrode is successfully applied for the determination of carbendazim in orange juice samples.
Highlights
The nanocomposites used as modifiers of electrochemical sensors have been studied to increase the intensity of the responses/signals, improving performance in electroanalytical detections.[1]
We described the preparation of reduced graphene/ZnCdTe semiconductor nanocrystal composites by growing the inorganic nanocrystals in situ onto the graphene sheets, and as well as a study of electrochemical determination of carbendazim pesticide in orange juice fruit by carbon paste electrodes modified with the reduced graphene/ZnCdTe composites
Absorption and emission bands are assigned to electron transitions involving semiconductor valence and conduction bands. Both absorption and emission bands of reduced graphene oxide (rGO)-supported ZnCdTe shifted to higher wavelengths compared to the aqueous colloidal ZnCdTe. This suggests that nanocrystal growth onto rGO sheets may favor the formation of larger particles due to nanocrystal aggregation, which is confirmed by Transmission electron microscopy (TEM) images
Summary
The nanocomposites used as modifiers of electrochemical sensors have been studied to increase the intensity of the responses/signals, improving performance in electroanalytical detections.[1]. We described the preparation of reduced graphene/ZnCdTe semiconductor nanocrystal composites by growing the inorganic nanocrystals in situ onto the graphene sheets, and as well as a study of electrochemical determination of carbendazim pesticide in orange juice fruit by carbon paste electrodes modified with the reduced graphene/ZnCdTe composites. The preparation of graphene-based materials using graphite as precursor was carried out by modified Hummers method,[10,22] followed by reduction with ascorbic acid to obtain reduced graphene oxide (rGO).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
