Piezoelectric Response in Hybrid Micropillar Arrays of Poly(Vinylidene Fluoride) and Reduced Graphene Oxide
Piezoelectric Response in Hybrid Micropillar Arrays of Poly(Vinylidene Fluoride) and Reduced Graphene Oxide
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DOI：
10.3390/polym11061065
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发表时间：
2019-06-01
期刊：
影响因子：
5
通讯作者：
Surmenev, Roman A.
中科院分区：
文献类型：
--
作者：
Pariy, Igor O.;Ivanova, Anna A.;Surmenev, Roman A.
本研究致力于研究通过软光刻和低温相转化获得的聚偏二氟乙烯（PVDF）微柱阵列。还原氧化石墨烯 (rGO) 作为成核填料掺入 PVDF 中。通过压电响应力显微镜（PFM）探索了 PVDF-rGO 复合微柱的压电特性。傅里叶变换红外光谱 (FTIR) 和 X 射线衍射 (XRD) 显示，所有研究样品中均同时存在 α、β 和 γ 相，其中以 γ 相为主。压电响应力显微镜 (PFM) 数据提供了 PVDF 微柱的局部压电响应，该响应在原始 PVDF 微柱中表现出温度诱导的向下偶极子方向。在PVDF基体中添加rGO导致首选偏振方向发生变化，压电响应相角从-120度变为20度-40度。原始PVDF和负载0.1 wt% rGO的PVDF在低温淬火后被发现分别具有86和87 pm/V的压电响应，明显高于|d(33)(eff)|对于压印 PVDF 64 pm/V。因此，rGO 的添加显着影响了磁畴取向（极化），同时淬火增加了压电响应。
This study was dedicated to the investigation of poly(vinylidene fluoride) (PVDF) micropillar arrays obtained by soft lithography followed by phase inversion at a low temperature. Reduced graphene oxide (rGO) was incorporated into the PVDF as a nucleating filler. The piezoelectric properties of the PVDF-rGO composite micropillars were explored via piezo-response force microscopy (PFM). Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) showed that alpha, beta, and gamma phases co-existed in all studied samples, with a predominance of the gamma phase. The piezoresponse force microscopy (PFM) data provided the local piezoelectric response of the PVDF micropillars, which exhibited a temperature-induced downward dipole orientation in the pristine PVDF micropillars. The addition of rGO into the PVDF matrix resulted in a change in the preferred polarization direction, and the piezo-response phase angle changed from -120 degrees to 20 degrees-40 degrees. The pristine PVDF and PVDF loaded with 0.1 wt % of rGO after low-temperature quenching were found to possess a piezoelectric response of 86 and 87 pm/V respectively, which are significantly higher than the |d(33)(eff)| in the case of imprinted PVDF 64 pm/V. Thus, the addition of rGO significantly affected the domain orientation (polarization) while quenching increased the piezoelectric response.