Low percolation threshold in flexible graphene/acrylic polyurethane composites with tunable negative permittivity
Source abstract
Abstract
Abstract Graphene (GR)/acrylic polyurethane (APU) composites with low percolation threshold and tunable negative permittivity were prepared by coating and pressing method. The microstructures and dielectric properties including alternating current conductivity ( σ ac ), reactance ( Z″ ) and permittivity ( ɛ′ and ɛ″ ) were investigated in detail. A percolation phenomenon from σ ac was observed when the GR content was increased from 0.9 to 6 vol%, and the percolation threshold was 1.8 vol%. The percolation threshold was obviously lower than those from the reported carbon/silicon nitride, carbon nanotube/phenolic resin and GR/phenolic resin composites, which was possibly attributed to the well dispersion and unique microstructure of GR in APU. Moreover, the negative permittivity was obtained from the much lower GR content (only 3 vol%) than the previously reported composites. In addition, compared with other composites with negative permittivity, the dielectric loss ( ɛ″ ) from the GR/APU composites was obviously reduced.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Dielectric materials and actuators · Electromagnetic wave absorption materials · Advanced Sensor and Energy Harvesting Materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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