NOVELTY - Polyvinylidene fluoride-trifluoroethylene/silver nanoparticle composite film is prepared by dissolving 5x 10-3 mol/L silver nitrate:aminopropyl triethoxysilane (APS) solution with volume ratio of 1:1 in N,N-dimethylformamide solvent, mixing, heating in water bath, reacting at 60-80 degrees C for 10 minutes to 2 hours to obtain silver nanoparticle colloidal solution, dissolving polyvinylidene fluoride-trifluoroethylene powder in silver nanoparticle colloidal solution with silver nanoparticle particle size of 20-30 nm, and stirring for 3-24 hours.    USE - Preparation of polyvinylidene fluoride-trifluoroethylene/silver nanoparticle composite film for high energy density capacitor and nonvolatile memory.    ADVANTAGE - Polyvinylidene fluoride-trifluoroethylene/silver nanoparticle composite film has good dispersion, compatibility, and dielectric properties, preparation is simple, efficient, and low-cost, and testing is simple and accurate and has stable electrode quality.    DETAILED DESCRIPTION - Polyvinylidene fluoride-trifluoroethylene/silver nanoparticle composite film is prepared by dissolving 5x 10-3 mol/L silver nitrate:aminopropyl triethoxysilane (APS) solution with volume ratio of 1:1 in N,N-dimethylformamide solvent, mixing, heating in water bath, reacting at 60-80 degrees C for 10 minutes to 2 hours to obtain silver nanoparticle colloidal solution, dissolving polyvinylidene fluoride-trifluoroethylene powder in silver nanoparticle colloidal solution with silver nanoparticle particle size of 20-30 nm, stirring for 3-24 hours to prepare uniformly dispersed polyvinylidene fluoride-trifluoroethylene/silver nanoparticle colloidal solution with concentration of 5 wt.%, cleaning, spin-coating into composite film in KW-4A spin coater using indium tin oxide (ITO) conductive glass as substrate with rotational speed of 500-1000 rpm for 10 s and rotational speed of 3000-5000 for 30-60 s, and heat treating and annealing at 120-140?oC for 3-8 hours to obtain composite film with thickness of 100-300 nm in which cleaning is performed by performing ultrasonic cleaning with acetone and ethanol for 10 minutes, repeatedly washing with deionized water, and dry cleaning with nitrogen. An INDEPENDENT CLAIM is included for testing of polyvinylidene fluoride-trifluoroethylene/silver nanoparticle composite film which involves magnetic sputtering using 200 mesh copper grid as mask plate with vacuum degree of 5x 10-3 Pa to form 20 nm thick chromium (Cr) and 100 nm gold (Au) layer on electrode, scratching corner of composite film, placing probe platform using ITO layer substrate surface as lower electrode and Au electrode upper film as upper electrode, connecting impedance tester with voltage of 2 V and frequency test range of 500 Hz to 2 MHz to obtain dielectric spectrum e.g. dielectric constant and dispersion relation of dielectric loss.    DESCRIPTION OF DRAWING(S) - The drawing shows x-ray diffraction pattern of polyvinylidene fluoride-trifluoroethylene/silver nanoparticle composite film.