P(VDF-co-TrFE) 共聚物和 P(VDF-ter-TrFE-ter-CTFE) 三元共聚物的纳米和宏观电活性响应,ACS Applied Polymer Materials

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P(VDF-co-TrFE) 共聚物和 P(VDF-ter-TrFE-ter-CTFE) 三元共聚物的纳米和宏观电活性响应
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2023-06-21 , DOI: 10.1021/acsapm.3c00534
Sara Zanchi ₁ , Antoine Pascaud ₁ , Fabrice Domingues Dos Santos ₂ , Sylvie Tencé-Girault _{1,

3} , Sébastien Roland ₁

Affiliation

P(VDF- co -TrFE)共聚物和P(VDF- ter -TrFE- ter电响应性的认识和改进-CTFE）三元共聚物薄膜对于其在电子设备中的应用至关重要。许多因素影响这些电活性薄膜的性能，例如化学成分和热处理。在本文中，研究了纳米和宏观尺度上共聚物和三元共聚物薄膜对外部电场的响应。纳米尺度的响应通过薄膜（~100 nm 厚）上的压响应力显微镜进行分析，而宏观尺度的响应则通过测量厚膜（~20 μm 厚）上的电位移-电场环进行分析。研究发现化学成分（CTFE 含量）的影响在纳米和宏观尺度上对于定义样品的电活性行为至关重要，而热处理似乎在纳米尺度上更加严重。晶体片层的取向、形状和尺寸影响电偶极子的取向，因此电偶极子对所施加的电场或多或少敏感。在低冷却速率下从熔体结晶后获得的边缘层状堆叠的受控生长提供了更好的薄膜压电响应。

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Nanometric and Macroscopic Electroactive Response of P(VDF-co-TrFE) Copolymers and P(VDF-ter-TrFE-ter-CTFE) Terpolymers

The knowledge and the improvement of the electric responsiveness of P(VDF-co-TrFE) copolymer and P(VDF-ter-TrFE-ter-CTFE) terpolymer films are essential for their application in electronic devices. Many factors affect the performances of these electroactive films, such as the chemical composition and the thermal treatment. In this article, the response to an external electric field of copolymer and terpolymer films at both the nanometric and macroscopic scales is studied. The response at the nanometric scale is analyzed by piezoresponse force microscopy on thin films (∼100 nm thick), while that at the macroscopic scale is analyzed by measuring the electric displacement–electric field loops on thick films (∼20 μm thick). The effect of the chemical composition (CTFE content) is found to be crucial, both at the nanometric and macroscopic scales, in defining the electroactive behavior of the samples, while the thermal treatment seems more exacerbated at the nanometric scale. The orientation, shape, and size of the crystalline lamellae affect the orientation of the electric dipoles, which are thus more or less sensitive to the applied electric field. The controlled growth of edge-on lamellar stacks, obtained after crystallization from the melt at low cooling rates, provides a better piezoresponse of the film.

更新日期：2023-06-21

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