SWNTs (single-walled carbon nanotubes)-IL (ionic liquid)-POM (polyoxometalate) functional composite material, and application thereof to preparation of electrochemical sensor

The invention discloses a SWNTs (single-walled carbon nanotubes)-IL (ionic liquid)-POM (polyoxometalate) functional composite material and a preparation method thereof, which belong to the technical field of preparation of functional materials, and the functional composite material is used for preparing an electrochemical sensor. The electrochemical sensor coated with the SWNTs-IL-POM functional composite material on the surface has the advantages of high sensitivity, low detection limit, high reaction speed, simplicity in operation, good stability, convenience in use, repeated use, low price, easiness in miniaturization, portability and the like, and lays a foundation for practical application. When the electrochemical sensor is applied to detection on concentration of NaIO3, NaBrO3 and NaNO2, the lowest detection limit can reach 0.9 microns, 1.3 microns and 1.3 microns respectively, and the linear ranges of detection are 0.004-0.73 mM, 0.2-3.84 mM and 0.02-4.33 mM respectively.