关于具有增强γ相的电活性聚偏氟乙烯/云母纳米片复合材料用于电容式和压电力传感的研究。

A study on electroactive PVDF/mica nanosheet composites with an enhanced γ-phase for capacitive and piezoelectric force sensing.

作者信息

Khalifa Mohammed, Schoeffmann Elisabeth, Lammer Herfried, Mahendran Arunjunai Raj, Wuzella Guenter, Anandhan S

机构信息

Kompetenzzentrum Holz GmbH, Altenberger Strasse 69, A-4040 Linz, Austria.

Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, Mangaluru-575025, India.

出版信息

Soft Matter. 2021 Dec 15;17(48):10891-10902. doi: 10.1039/d1sm01236c.

DOI:10.1039/d1sm01236c

PMID:34807219

Abstract

Herein, a multifunctional poly(vinylidene fluoride) (PVDF)/mica nanosheet composite (PMNC) thin film was developed for preparing a capacitive and piezoelectric force sensor. A high electroactive γ-phase content (89%) of PVDF was achieved through a facile rapid cooling process of PMNC films. The crystallinity of PVDF decreased upon the addition of mica nanosheets, while the dielectric constant increased significantly (∼300%). The capacitance-based PMNC pressure sensor was found to be sensitive to the applied pressure. On the other hand, piezoelectric voltages of 18 V (single layer) and 32 V (multi-layer) were generated for PMNCs loaded with 1% mica nanosheets. Furthermore, a PMNC based nanogenerator generated a power density of 8.8 μW cm and showed excellent durability (>60 000 cycles). High flexibility, lightweight and skin-friendly PMNCs could be a potential material in applications such as energy harvesting, energy storage, actuators, and self-powered and smart wearable electronic devices.

摘要

在此，开发了一种多功能聚偏二氟乙烯（PVDF）/云母纳米片复合材料（PMNC）薄膜，用于制备电容式和压电力传感器。通过PMNC薄膜的简便快速冷却工艺，实现了PVDF的高电活性γ相含量（89%）。添加云母纳米片后，PVDF的结晶度降低，而介电常数显著增加（约300%）。基于电容的PMNC压力传感器被发现对施加的压力敏感。另一方面，对于负载1%云母纳米片的PMNC，产生了18 V（单层）和32 V（多层）的压电电压。此外，基于PMNC的纳米发电机产生的功率密度为8.8 μW/cm²，并且表现出优异的耐久性（>60000次循环）。高柔韧性、轻质且对皮肤友好的PMNC可能成为能量收集、能量存储、致动器以及自供电和智能可穿戴电子设备等应用中的潜在材料。