Functionalization of Graphene and Dielectric Property Relationships in PVDF/graphene Nanosheets Composites

Abstract

In this paper, a series of the functionalized graphenes, such as graphene oxide (GO), reduced graphene oxide (rGO), carboxylated graphene oxide (GOCOOH), reduce carboxylated graphene oxide (rGOCOOH), fluorinated graphene oxide (GOF), and reduce fluorinated graphene oxide (rGOF), were successfully fabricated, and were introduced into the Poly (vinylidene fluoride) (PVDF) matrix to form composites. The effects of these functional groups on dielectric properties of GO/PVDF composites were systematically investigated. The results show that the reduced functional graphene/PVDF composites (rGOCOOH/PVDF, rGOF/PVDF) exhibit more excellent dielectric properties than that of composite samples without undergoing the reduction reaction (GOCOOH/PVDF, GOF/PVDF). The reduced samples not only possess high dielectric constant, but also maintain lower dielectric loss. And, the rGOCOOH/PVDF composite has better dielectric properties ( r = 17.64, tg = 0.031) than others, due to strong interfacial and dipolar interactions between PVDF matrix and fillers. These results could be used as a guide to tune dielectric properties of polymer/ graphene composites for their applications in embedded capacitors.

Piezoelectric Response in Electrospun Poly(vinylidene fluoride) Fibers Containing Fluoro-Doped Graphene Derivatives

“…For instance, Zheng et al has demonstrated that incorporation of reduced graphene derivatives exhibit enhanced dielectric permittivity and low dielectric loss as compared to samples without undergoing the reduction reaction. 57 This was attributed to strong interfacial interaction between the PVDF matrix and reduced graphene derivatives. The frequency dependent dielectric constant and dielectric loss of PVDF doped with various graphene derivatives of compression-molded samples are presented in Figure 6.…”

Extrusion of Polymer Nanocomposites with Graphene and Graphene Derivative Nanofillers: An Overview of Recent Developments

“…Methods for achieving the dispersion of graphene in polymer matrices [14] usually include the use of a solvent in which both graphene and the polymer are dispersed and then co-precipitated [15]. Alternatively, the solvent is evaporated, and the dried dispersion is obtained as a film [16,17]. Another method that consists of adding graphene to the monomer before polymerization is carried out to obtain the corresponding composite material [18,19].…”

Exploring Surface and Tunneling Properties of Defect-Oriented Quasi-Graphene/Poly(vinylidene fluoride) Nanocomposite Films as Flexible 2D Materials for Electronic Applications

“…7−11,18−21 GOs can be chemically coated onto the surfaces of either carbon fibers or carbon fabric to augment the interfacial bonding properties through the surrounding polymer matrix of the composites. 12−17,22−27 On the other hand, poly(vinylindene fluoride) (PVDF) is known for displaying ferroelectric behavior below 150 °C while pyroelectric and piezoelectric properties at room temperature. 28,29 It also exhibits low dissipation and good permittivity.…”