Fabrication of Novel Electromagnetic Shielding Sheets Using Carbon-Nanotube-Composite Paper

Abstract

We propose a new electromagnetic shielding (EMS) sheet that uses carbon nanotube (CNT)-composite paper. The electromagnetic environment in which electronic devices such as mobile phones and personal computers operate has become increasingly complex due to increased electromagnetic noise. This noise can cause unexpected behavior in electronic devices. Therefore, EMS sheets are required to shield devices from this noise. Carbon-nanotube composite paper has high electrical conductivity despite being a paper and does not deteriorate like metallic materials which are commonly used for EMS sheets. In this study, we aim to use CNT-composite paper to develop new EMS sheets that have a high shielding effectiveness (SE) (over 30 dB) at frequencies in the 0.1 MHz to 1 GHz range. To achieve this, we made test samples and measured their SE with the Kansai Electronic Industry Development Center (KEC) method. The first CNT-composite paper we developed achieved an SE of 20-50 dB from 0.1 MHz to 100 MHz. However, the SE was 16 dB in the GHz band. To increase the SE in this band, we designed and simulated many different shapes of shielding sheet which we then fabricated to measure their SE. We obtained positive results, indicating that a new shielding paper shape has a higher SE in the GHz band.

Electrodynamic properties of the nanocarbon/polymer composites with aligned by magnetic field secondary non-conductive component

“…Conductive polymer composites containing conductive nanostructured fillers (metallic particles, metallic and carbon fibers, blacks, etc.) reach such technical level, which make them competitive with conventional conductive materials (metals) due to low manufacturing cost, low density, manufacturability (compatibility and possibility to produce elements of arbitrary shape), corrosion resistance and ecological safety 8 . Recently it was showed that using nanostructural elements assembled at different length scales within the binding matrix could result in tunable dielectric response over a wide frequency range 9 .…”

Low-temperature thermal conductivity in polycrystalline graphene

“…where S 0 is the cross-section area per one atom of the lattice and Γ is the measure of the scattering strength. It was suggested in [15] that grain boundaries can be naturally described by disclinations. In graphene, the alternating pentagon-heptagon structure along high-angle GBs was revealed in [8].…”

Carbon-nanotube-based ultralight materials for ultrabroadband electromagnetic wave shielding and absorption

“…A previous study demonstrated a cellulose/CNT composite paper with high EM shielding performance. 27,28) This composite paper showed a high conductivity of 1.9 × 10 2 S m −1 with 8.3 wt% CNTs and a high shielding performance of 20-40 dB in the range of 15-40 GHz. 27) However, the density of these CNT composite papers was approximately 1.2 × 10 3 mg cm −3 .…”