Highly conductive Ti 3 C 2 MXene-supported CoAl-layered double hydroxide nanosheets for ultrasensitive electrochemical detection of organophosphate pesticide fenitrothion.
Hui ZhangJun WangKaili LiRuixue YangShifeng CaiYang LiTianrong ZhanPublished in: Mikrochimica acta (2024)
A novel electrochemical method is presented for ultrasensitive detection of the organophosphate pesticide (OPP) fenitrothion by using Ti 3 C 2 MXene/CoAl-LDH nanocomposite as the electrode modifier. The Ti 3 C 2 MXene/CoAl-LDH nanocomposite is synthesized by growing CoAl-LDH in situ on MXene nanosheets. The combination of two ultrathin 2D materials provides more active sites, larger specific surface area, superior adsorption properties, and better electrical conductivity, which leads to rapid electron-transfer and mass-transfer between the substrate electrode and analytes when it is acted as the electrochemical sensing material. In addition, through the chelation of phosphate groups with the Ti defect sites enriched in MXene, OPP is adsorbed on the electrode. Consequently, the corresponding modified electrode gives rise to a wide linear response range of 0.03 ~ 120 μmol/L for the differential pulse voltammetry detection of fenitrothion with a low detection limit of 5.8 nmol/L (3σ). The method offers good repeatability, stability, selectivity, and practicability for real samples. This strategy provides a reference platform for the electrochemical monitoring of trace OPPs residue by using MXene/LDH-based nanocomposites.
Keyphrases
- label free
- reduced graphene oxide
- gold nanoparticles
- loop mediated isothermal amplification
- carbon nanotubes
- electron transfer
- quantum dots
- heavy metals
- molecularly imprinted
- particulate matter
- risk assessment
- ionic liquid
- real time pcr
- blood pressure
- aqueous solution
- sensitive detection
- solid state
- highly efficient
- high throughput
- visible light
- transition metal
- liquid chromatography