标题:Microscopic study of polydopamine modified BaTiO3/poly(vinylidene fluoride-trifluoroethylene) nanocomposite films
作者:Guo, Haiyan ;Liu, Na ;Liu, Xin ;Hong, Seungbum
作者机构:[Guo, Haiyan ;Liu, Na ] College of Intelligent Manufacturing, Qingdao Huanghai University, 3111 Linghai Rd, Qingdao; Huangdao District; 266427, China; 更多
通讯作者:Guo, Haiyan
来源:Thin Solid Films
出版年:2019
卷:682
页码:121-125
DOI:10.1016/j.tsf.2019.04.053
摘要:Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] has been intensively studied because of its good piezoelectric properties and at the same time being flexible and bio-compatible, making it a strong candidate for biomedical application. Doping with inorganic piezoceramic nanoparticles will enhance its ferro−/piezoelectricity. Further enhancements in ferro−/piezoelectricity of P(VDF-TrFE) are expected from surface modification of the nanoparticles through improving the bonding between the nanoparticles and polymer matrix. In this paper, a piezoresponse force microscopy (PFM) study on P(VDF-TrFE) doped with polydopamine modified BaTiO3 (BT-Pdop) nanoparticles is introduced. The microscopic study is complicated by the fine domain structures. As ferro−/piezoelectricity is directly related with domain size, instead of a domain-wise study, a statistical correlation (domain size) analysis was carried out for this composite. Since PFM measurement is based on the converse piezoelectric effect (the first harmonic response of the sample surface upon the applied electric stimulation), topographical effects should be taken into account in analyzing the related piezoresponse images. Hence, the correlation lengths of both topographical and piezoresponse images on the same area were studied. The doping dependence of the correlation length of BT-Pdop/P(VDF-TrFE) behaves differently for piezoresponse (polarization) and topography (grain) images. In particular, the correlation lengths of piezoresponse and topography images are in different ranges: 23–29 nm for the former and 55–66 nm for the latter; also, the composition dependences are different. Accordingly, the piezocorrelation reflects the material's real piezoresponse. It can also be deduced that the macroscopic polarization behavior in Pdop-BT/P(VDF-TrFE) results from extrinsic contributions.
© 2019
收录类别:EI
资源类型:期刊论文
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