کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7834069 1503526 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High dielectric permittivity and suppressed loss tangent in PVDF polymer nanocomposites using gold nanoparticle-deposited BaTiO3 hybrid particles as fillers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
High dielectric permittivity and suppressed loss tangent in PVDF polymer nanocomposites using gold nanoparticle-deposited BaTiO3 hybrid particles as fillers
چکیده انگلیسی
A high dielectric permittivity (ε′) with a suppressed loss tangent (tanδ) can be obtained in poly(vinylidene fluoride) (PVDF) polymer nanocomposites using gold (Au)−deposited nano-BaTiO3 hybrid particles (Au-nBT) as fillers. Au-nBT hybrid particles were successfully prepared by a modified Turkevich method, while Au-nBT/PVDF nanocomposites were prepared using liquid-phase assisted dispersion and hot-pressing methods. Au nanoparticles with sizes of ≈10-30 nm were discretely grown on the nBT surface, which efficiently inhibited continuous contact between conductive Au nanoparticles and formation of conducting paths in the polymer matrix. This can cause suppression of conductivity and related tanδ values. Interestingly, ε′ of the Au-nBT/PVDF nanocomposites increased from 26.7 to 158.2 (at 1 kHz) with increased filler loadings from 4 to 62 vol%, while tanδ slightly increased from 0.034 to 0.055 with very low conductivities (σ < 10−9 S/cm). Greatly enhanced ε′ values that were slightly dependent on frequency in the range of 102−106 Hz are attributed to an enhanced local electric field strength, inducing stronger dipolar polarization in the Au-nBT/PVDF nanocomposites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 446, 15 July 2018, Pages 236-242
نویسندگان
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