Enhancement of the piezoelectric coefficient in PVDF-TrFe/CoFe 2 O 4 nanocomposites through DC magnetic poling

Beilstein Journal of Nanotechnology

article

Marco Fortunato¹  Alessio Tamburrano¹  Maria Paola Bracciale¹  Maria Laura Santarelli¹  Maria Sabrina Sarto¹ 

[1] Nanotechnology Research Center Applied to Engineering ,(CNIS), Sapienza University of Rome;Department of Astronautical, Electrical and Energy Engineering, Sapienza University of Rome;Department of Chemical Engineering Materials and Environment, Sapienza University of Rome

关键词: CoFe2O4;    magnetic poling;    piezoelectric effect;    piezoresponse forcemicroscopy (PFM);    poly(vinylidene fluoride-co-trifluoroethylene);    PVDF-TrFe;    PVDF-TrFe nanocomposites;   

DOI  :  10.3762/bjnano.12.93

学科分类：环境监测和分析

来源: Beilstein - Institut zur Foerderung der Chemischen Wissenschaften

【 摘 要 】

In the last years flexible, low-cost, wearable, and innovative piezoelectric nanomaterials have attracted considerable interestregarding the development of energy harvesters and sensors. Among the piezoelectric materials, special attention has been paid toelectroactive polymers such as poly(vinylidene fluoride) (PVDF) and its copolymer poly(vinylidene fluoride-co-trifluoroethylene)(PVDF-TrFe), which is one of the most extensively investigated piezoelectric polymers, due to the high β phase content resultingfrom specific curing or processing conditions. However, to obtain a high piezoelectric coefficient (d33) alignment of the β phasedomains is needed, which is usually reached through applying a high electric field at moderate temperatures. This process, usuallyreferred to as electrical poling, requires the deposition of contact electrodes on the sample surface and the use of high-voltage apparatus. In the present work, in order to overcome these constraints, we have produced, characterized, and studied a polymer nanocomposite consisting of CoFe2O4 nanoparticles dispersed in PVDF-TrFe with enhancement of the β phase alignment through anapplied DC magnetic field. The magnetic poling was demonstrated to be particularly effective, leading to a piezoelectric coefficientd33 with values up to 39 pm/V. This type of poling does not need the use of a top electrode or of high magnetic fields (themaximum value of d33 was obtained at 50 mT, using a current of 0.4 A) making the PVDF-TrFE/CoFe2O4 nanocomposite suitablefor the fabrication of highly efficient devices for energy harvesting and wearable sensors.

【 授权许可】

CC BY