Robust Polarization Stability in a Self‐Assembled Ultrathin Organic Ferroelectric Nano Lamellae
Robust Polarization Stability in a Self‐Assembled Ultrathin Organic Ferroelectric Nano Lamellae
复制标题
自组装超薄有机铁电纳米片层具有强大的偏振稳定性
DOI：
10.1002/aelm.202001085
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发表时间：
2021-03
影响因子：
6.2
通讯作者：
Pamarti Viswanath;K. K. H. De Silva-K.;Y. Morikuni;M. Yoshimura
中科院分区：
文献类型：
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作者：
Pamarti Viswanath;K. K. H. De Silva-K.;Y. Morikuni;M. Yoshimura
自发极化是铁电材料的特征，其可以通过施加外部电场来切换。然而，在实际场景中，为了实现功能器件，切换的偏振应该是稳定的。在这项研究中，利用单层（约40 nm）氧化石墨烯（GO）膜上自组装的聚（偏二氟乙烯-三氟乙烯（PVDF-TrFE）膜。GO的氧官能团和缺陷结构可以充当畴钉扎位点，以通过氢键和库仑相互作用向PVDF-TrFE提供强的铁电畴稳定性沿着特定的晶体取向。基于扫描探针显微镜的开关实验显示，这些薄膜具有优异的压电响应（d33 = −145 pm V−1）沿着的高极化保持率（超过1500 h，无挥发），为高性能小型化有机铁电器件铺平了新的道路。
Spontaneous polarization is a characteristic feature of a ferroelectric material that can be switched by the application of an external electric field. However, in a practical scenario, the switched polarization should be stable for the realization of functional devices. In this study, an ultrathin (≈40 nm) poly(vinylidene fluoride‐trifluoroethylene (PVDF‐TrFE) film self‐assembled on a monolayer (≈1 nm) graphene oxide (GO) film is exploited. Oxygen‐functional groups and defective structure of GO can act as domain pinning sites to provide strong ferroelectric domain stability along with a specific crystal orientation to PVDF‐TrFE through hydrogen bonds and columbic interactions. Scanning probe microscopy based switching experiments reveal excellent piezoelectric response (d33 = −145 pm V−1) along with high polarization retention (over 1500 h with no volatilization) in these ultrathin films, paving new pathways toward high performance miniaturized organic ferroelectric devices.