Investigation of the Morphology and Piezoelectric Properties of Mixed Langmuir Monolayers of PVDF and P(VDF:TFE)

Abstract

Polyvinylidene fluoride (PVDF) is of considerable interest for flexible electronics and sensor devices due to its combination of mechanical flexibility and piezoelectric properties. One approach to controlling its structure and piezoelectric activity is the formation of composite films consisting of a PVDF polymer matrix and a functional filler. Graphene oxide (GO) is considered a promising filler because, even at relatively low concentrations, it can affect the phase composition, morphology, mechanical properties, and dielectric characteristics of PVDF films. Therefore, the aim of this study was to investigate the effect of GO on the morphology and local piezoelectric properties of PVDF films.
To identify local effects associated with the presence of GO particles and interfacial interactions between the components, thin films were investigated, since such changes may be manifested more clearly in thin-film systems than in bulk materials. Therefore, the Langmuir–Blodgett technique was used to fabricate thin PVDF-based composite films. Langmuir monolayers based on PVDF were formed on the surface of deionized water and transferred on the solid substrate at 15 mN/m. Their morphology, local piezoresponse distribution, and piezoelectric hysteresis loops were investigated by PFM. The highest effective piezoelectric coefficient was obtained for the thermally treated PVDF:GO film and amounted to 3.8 pm/V. The obtained results demonstrate the possibility of intentionally controlling the morphology and piezoelectric activity of ultrathin polymer coatings by varying their composition.
This study was financially supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of State Assignment No. FFWZ-2024-0006.

Speaker

Gorbachev Ilya A.
IRE Kotelnikova RAS
Russia

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