期刊
MICROCHEMICAL JOURNAL
卷 183, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.microc.2022.107979
关键词
Sensor; Catalysis; Multiple amplification; Imidacloprid; Graphene oxide
资金
- Hainan Provincial Department of Science and Technology, China [ZDYF2020185]
- China Agriculture Research System of MOF and MARA [CARS-31]
- Central PublicInterest Scientific Institution Basal Research Fund [1630082020001, 1630082021005]
- Key Laboratory of Tropical Fruits and Vegetables Quality and Safety for State Market Regulation [ZX-2022002]
This study proposes a new strategy for preparing electrochemical sensors with multiple amplification effects, which successfully detects imidacloprid. By introducing graphene oxide, gold nanoparticles, and beta-cyclodextrin, the prepared sensor exhibits high sensitivity and detection limit, achieving good recovery rates in actual samples.
The key to improving the sensitivity of electrochemical sensors for direct detection is the introduction of cata-lytically amplified nanomaterials. Accordingly, in this study, a new strategy for the preparation of electro-chemical sensors with multiple amplification effects is proposed. Graphene oxide (GO), gold nanoparticles (Au NPs), and beta-cyclodextrin (beta-CD) were introduced to the surface of a glassy carbon electrode via cyclic voltam-metry to prepare a modified electrode sensor with a GO/Au NPs/beta-CD thin film. The prepared sensor effectively catalyzed and amplified the reduction current of imidacloprid in a B-R buffer with pH = 5.0 owning to the multiple amplification effects of GO/Au NPs/beta-CD. A good linear relationship was observed the level of the reduction current response and the imidacloprid at concentrations ranging from approximately 5 x 10-10 to 3000 x 10-10 mol/L; thus, a new imidacloprid detection method using an electrochemical sensor was estab-lished. The new method, whose detection limit reached 1.33 x 10-10 mol/L, was tested on actual samples, achieving recoveries of 92.0 % to 110.0 %.
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