Abstract
Nowadays, many types of materials are elaborated for microwave absorption applications. Carbon-based nanoparticles belong to these types of materials. Among these, graphene presents some distinctive features for electromagnetic radiation absorption and thus microwave isolation applications. In this paper, the dielectric characteristics and microwave absorption properties of epoxy resin loaded with graphene particles are presented from 2 GHz to 18 GHz. The influence of various parameters such as particle size (3 µm, 6–8 µm, and 15 µm) and weight ratio (from 5% to 25%) are presented, studied, and discussed. The sample loaded with the smallest graphene size (3 µm) and the highest weight ratio (25%) exhibits high loss tangent (tanδ = 0.36) and a middle dielectric constant ε′ = 12–14 in the 8–10 GHz frequency range. As expected, this sample also provides the highest absorption level: from 5 dB/cm at 4 GHz to 16 dB/cm at 18 GHz.
Highlights
Graphene is made out of a two-dimensional carbon structure in hexagonal lattice with a nanosizing in the perpendicular direction
The graphene particles consist of the agglomeration of single-layer graphene flakes, each about 0.34-nm-thick corresponding to the interlayer spacing of graphite from sp2 carbon chemistry [9]
Samples loaded with graphene particles of different sizes at a fixed weight ratio (10%) were first studied
Summary
Graphene is made out of a two-dimensional carbon structure in hexagonal lattice with a nanosizing in the perpendicular direction It presents interesting thermal, mechanical, and electrical properties [1] along with light weight and high electrical characteristics: electron mobility μ = 230,000 cm2 ·V−1 ·s−1 [2] and conductivity σ (σ = 400 S·m−1 in the powder form [3] and σ = 5 × 106 S·m−1 in thin layer form [4]). Mechanical, and electrical properties [1] along with light weight and high electrical characteristics: electron mobility μ = 230,000 cm2 ·V−1 ·s−1 [2] and conductivity σ (σ = 400 S·m−1 in the powder form [3] and σ = 5 × 106 S·m−1 in thin layer form [4]) Another graphene characteristic has been highlighted in recent years: its microwave absorption and electromagnetic shielding abilities. Graphene nanoplatelets in epoxy resin exhibit −14.5 dB maximum reflection loss at 18.9 GHz, mainly attributed to the charge multipoles at the polarized interfaces into the composite material [8]
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