Two different morphologies of ZnO（lotus-shaped, rod-shaped） and ZnO/PVDF composite materials were prepared. The morphologies of ZnO and composite materials were characterized by scanning electron microscopy（SEM） a...Two different morphologies of ZnO（lotus-shaped, rod-shaped） and ZnO/PVDF composite materials were prepared. The morphologies of ZnO and composite materials were characterized by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. Fourier transform infrared spectroscopy（FT-IR）, thermal gravimetry（TG）, and X-ray diffraction（XRD） were also used to characterize the chemical structures and phase composites of ZnO and ZnO/PVDF composite materials. Breakdown voltage, dielectric constant and dielectric loss of ZnO/PVDF composite materials were also tested. Microstructure analysis showed that ZnO nanoparticles dispersed uniformly in the matrix. And the dielectric constant expresses a significantly improvement while the dielectric loss and breakdown voltage expresses no significant change. Moreover, dielectric constant keeps an improvement tendency with increasing content of ZnO.展开更多
A single organic composite material having high dielectric constant is difficult to meet the needs of the market.Nowadays,polymer matrix-based composites have become a promising option that researchers are focusing on...A single organic composite material having high dielectric constant is difficult to meet the needs of the market.Nowadays,polymer matrix-based composites have become a promising option that researchers are focusing on.Aldoped zinc oxide(ZnO)and composites containing ZnO as reinforcement and poly(vinylidene fluoride)(PVDF)as matrix were prepared.The microstructure of composites was analysed by scanning electron microscope and transmission electron microscopy techniques.The chemical structures and crystallisation behaviour of the materials were investigated by the means of FT-IR and X-ray diffractometer.ZnO,having both rod-and sheet-shaped,was evenly distributed within the PVDF material.Additionally,the dielectric properties and breakdown field strength of composite were tested.As the content of the fillers was kept steady,the dielectric constant of the composite material increased proportionally with the Al content.Thus,a composite containing 10%ZnO with 7%Al displayed a dielectric constant of 18.5 at 100 Hz,twice when compared with the pure ZnO/PVDF composites.This phenomenon was attributed to ZnO semiconductor properties which can significantly improve the conductive nature of the materials.展开更多
基金Funded by the National Natural Science Foundation of China(51677045)the Natural Science Foundation of Heilongjiang Province of China(E201224)
文摘Two different morphologies of ZnO（lotus-shaped, rod-shaped） and ZnO/PVDF composite materials were prepared. The morphologies of ZnO and composite materials were characterized by scanning electron microscopy（SEM） and transmission electron microscopy（TEM）. Fourier transform infrared spectroscopy（FT-IR）, thermal gravimetry（TG）, and X-ray diffraction（XRD） were also used to characterize the chemical structures and phase composites of ZnO and ZnO/PVDF composite materials. Breakdown voltage, dielectric constant and dielectric loss of ZnO/PVDF composite materials were also tested. Microstructure analysis showed that ZnO nanoparticles dispersed uniformly in the matrix. And the dielectric constant expresses a significantly improvement while the dielectric loss and breakdown voltage expresses no significant change. Moreover, dielectric constant keeps an improvement tendency with increasing content of ZnO.
基金We are thankful for the financial support from the National Natural Science Foundation of China(Grant no.51677040)the Natural Science Foundation of Heilongjiang Province of China(Grant no.E201224).
文摘A single organic composite material having high dielectric constant is difficult to meet the needs of the market.Nowadays,polymer matrix-based composites have become a promising option that researchers are focusing on.Aldoped zinc oxide(ZnO)and composites containing ZnO as reinforcement and poly(vinylidene fluoride)(PVDF)as matrix were prepared.The microstructure of composites was analysed by scanning electron microscope and transmission electron microscopy techniques.The chemical structures and crystallisation behaviour of the materials were investigated by the means of FT-IR and X-ray diffractometer.ZnO,having both rod-and sheet-shaped,was evenly distributed within the PVDF material.Additionally,the dielectric properties and breakdown field strength of composite were tested.As the content of the fillers was kept steady,the dielectric constant of the composite material increased proportionally with the Al content.Thus,a composite containing 10%ZnO with 7%Al displayed a dielectric constant of 18.5 at 100 Hz,twice when compared with the pure ZnO/PVDF composites.This phenomenon was attributed to ZnO semiconductor properties which can significantly improve the conductive nature of the materials.
