P(VDF-TrFE)/Ag复合薄膜的铁电以及介电性能研究

The ferroelectric and dielectric properties of poly(vinylidenefluoride-trifluoroethylene) copolymer /Ag composite films

利用旋涂法制备并采用氢气退火处理得到P(VDF-TrFE)/Ag复合薄膜,在XRD图像上可以观察到在2θ=38.1°的Ag(111)相的衍射峰,同样在SEM图像上观察到银纳米粒子的存在.在薄膜的红外透射光谱上可以观察到β相特征峰的蓝移,这可归结为银纳米粒子与偶极子的相互作用.银纳米粒子的掺杂增强了薄膜的铁电和介电性能.与传统退火方式处理的纯P(VDF-TrFE)薄膜相比,纳米银掺杂比例为10%的P(VDF-TrFE)/Ag复合薄膜的铁电剩余极化强度和介电常数分别提高了32.5%和13.3%.介电损耗不随纳米银掺杂比例的增加而变化的现象不符合渗流理论.

The poly（vinylidenefluoride-trifluoroethylene）/Ag composite films are derived by spin-coating and annealed at hydrogen atmosphere. Ag （ 111 ） phase labeled at the diffraction peak 20 = 38. 1 is observed from X-ray diffraction （XRD） pattern, and it was also proved from scanning electron microscope （SEM） images. A blue shift was observed in the infrared transmission spectrum of the composite films, which suggests the interaction of dipole and silver nanoparti- cles. The ferroelectric polarization and dielectric constant of P（ VDF-TrFE）/Ag composite thin films increase by 32.5% and 13.3%, respectively, compared with the pure polymer films under air annealing. The dielectric loss tangent of the P （VDF-TrFE）/Ag composite films is independent of Ag doping ratios, which violates the percolation theory.