▎ 摘　　要

NOVELTY - Preparing nanoparticle capable of continuously tuning physical property involves mixing graphene oxide (GO) and barium titanate nanoparticles with deionized water, dispersing ultrasonically at 0-5℃ for 20-40 minutes to obtain a dispersion, placing dispersion liquid in the atomization cup of the ultrasonic nebulizer, oscillating ultrasonically dispersion liquid into small droplets, driving by the carrier gas into the high temperature zone of the tube furnace, drying quickly at 500-600℃, and performing suction filtration onto the receiving film of the receiver. USE - Method for preparing nanoparticle capable of continuously tuning physical property used for preparing composite material (claimed). ADVANTAGE - The method can use graphene oxide (GO) as a flexible shell material, and is coated on the surface of nano-barium titanate particles to form nanocomposite particles with a core-shell structure through structural design can be tuned by changing the number and type of oxygen-containing functional groups on the surface of GO, that is, the insulating modulation from the oxidized state to the reduced graphene state. The nanoparticle is mixed with different electrical conductivities and polymers with ferroelectric properties to prepare composite films can obtain composite materials with different interface physical properties, The highest dielectric constant of the composite film is 54.9% higher than that of PVDF, and the energy storage density is increased by 78.2%, while the dielectric loss remains in a lower range. DETAILED DESCRIPTION - Preparing nanoparticle capable of continuously tuning physical property involves mixing graphene oxide (GO) and barium titanate nanoparticles with deionized water, dispersing ultrasonically at 0-5℃ for 20-40 minutes to obtain a dispersion, placing dispersion liquid in the atomization cup of the ultrasonic nebulizer, oscillating ultrasonically dispersion liquid into small droplets, driving by the carrier gas into the high temperature zone of the tube furnace, drying quickly at 500-600℃, performing suction filtration onto the receiving film of the receiver, removing the particles to obtain spherical nanoparticles, which are denoted as M-BTO doped GO, putting M-BTO doped GO in hydroiodic acid vapor, reacting at 80-100℃ for 10-120 minutes to obtain nanoparticles with high conductivity, which are denoted as H-BTO doped GO, mixing M-BTO doped GO or H-BTO doped GO, toluene and azobisisobutyronitrile, reacting for 2-4 hours under the protection of inert gas, filtering after the reaction is completed, washing with toluene, drying the precipitate under vacuum at 50℃ for 6-24 hours, adding obtained product to sodium hydroxide (NaOH) methanol solution, refluxing at 60℃ for 48 hours, washing with ultrapure water after the end, adding hydrochloric acid solution to acidify, and washing again with ultrapure water to neutrality to obtain nanoparticles with low conductivity, which are denoted as L-BTO doped GO. INDEPENDENT CLAIMS are included for: 1. a nanoparticle capable of continuously tuning physical property is prepared by preparation method, which comprises: BTO doped GO nanoparticles with different electrical conductivity, specifically, M-BTO doped GO, H-BTO doped GO or L-BTO doped GO; and 2. a method for preparing a composite material whose interfacial physical properties can be continuously tuned by applying the nanoparticle, which involves: (a) mixing BTO doped GO nanoparticles with different conductivity with polymer substances and solvent; (b) spin-coating; and (c) drying to obtain composite film with different interfacial property.