Increased dielectric performance of PVDF-based composites by electrochemical exfoliated graphite additives

Yuanzhen Du; Dawei Cao; Yuan Liu; Quan Wang

doi:10.1088/1361-6528/ac28d9

Increased dielectric performance of PVDF-based composites by electrochemical exfoliated graphite additives

Nanotechnology. 2021 Oct 6;32(50). doi: 10.1088/1361-6528/ac28d9.

Authors

Yuanzhen Du¹, Dawei Cao¹, Yuan Liu¹, Quan Wang^{1

2}

Affiliations

¹ Zhenjiang Key Laboratory of Advanced Sensing Materials and Devices, Jiangsu University, Zhenjiang 212013, People's Republic of China.
² State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China.

PMID: 34547731
DOI: 10.1088/1361-6528/ac28d9

Abstract

Adding conductive graphene into polyvinyliden1 fluoride (PVDF) is an effective method to improve the dielectric properties. However, the high conductivity and uniform distribution of graphene in PVDF matrix still meet challenges. In this work, electrochemical exfoliated graphite (EEG) with good conductivity and solution dispersion is used to prepare PVDF/EEG films. By this method no specific conditions are needed such as reduction or hot press. The dielectric properties and flexibility of PVDF/EEG films of different concentrations of EEG are investigated. Especially, when EEG content is 2.6 wt%, composite film has a high dielectric constant of 86 and a low dielectric loss of 0.9 (100 Hz). Simultaneously, the tensile strength of the film was up to 55.1 MPa. The preparation method is simple and convenient, and the obtained material has high dielectric constant and tensile strength. This method paves the way for the application of flexible electronic sensing equipment.

Keywords: PVDF; dielectric properties; electrolytic graphene; flexibility.