Abstract
This paper deals with the design, preparation, and characterization of conductive and flexible nanopapers based on graphite nanoplates (GNP) and polydimethylsiloxane (PDMS). Highly porous GNP nanopapers were first prepared by filtration from a GNP suspension in a solvent. Subsequently, PDMS impregnation was carried out to obtain a composite material. By varying the concentration of the polymer solution and the deposition time, PDMS/GNP nanopapers were produced with a wide range of PDMS contents, porosities, and densities. Thermal diffusivity of the composite films (both in-plane and cross-plane) were measured and correlated with the structure of the nanopapers. Selected formulations were investigated in detail for their physical, thermal, and mechanical properties, exhibiting high flexibility and resistance to more than 50 repeated bendings, stiffness of up to 1.3 MPa, and thermal conductivity of up to 25 W/m∙K. Based on the properties obtained, the materials presented in this paper may find applications in modern lightweight and flexible electronic devices.
Highlights
Building on the previous state of the art, this paper focused on the preparation and characterization of highly conductive and flexible sheets by PDMS impregnation into
Pristine graphite nanoplates (GNP) nanopapers were observed by SEM and expectedly found to be highly porous (Figure 1a,c), with thickness in the range of 200–300 μm and density in the range of 0.07–0.12 mg/mm3, which is perfectly suitable for solution impregnation with a polymer solution
It is worth mentioning that this value is still relatively low compared with previously reported GNP nanopapers
Summary
The term graphene refers to a carbon sheet with a hexagonal structure sp hybridized, with the thickness of a single atom. The availability of this material for bulk applications remains very limited, while several graphene-related materials are widely available, including graphene oxide, reduced graphene oxide, multilayered graphene, and graphite nanoplates (GNPs) [4]. It has been demonstrated that a higher concentration of microstructural defects reduces the thermal conductivity of graphene and related materials [11,12]. This is directly reflected in the thermal conductivity of the relative polymer nanocomposites, where low-quality graphene or graphene-related materials do not allow achieving satisfactory performance [5,13]
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