Multilayer-Structured Wood Electroless Cu–Ni Composite Coatings for Electromagnetic Interference Shielding

Abstract

The lightweight multilayer-structured electromagnetic interference shielding composite coatings with controllable electromagnetic gradient on wood surface were prepared via a simple multiple electroless copper–nickel (Cu–Ni) approach. The surface morphology, conductivity, hydrophobicity property and electromagnetic shielding effectiveness of the composite coatings were investigated. The surface roughness and conductivity of the composite coatings were enhanced with the increase in the number of depositions. The surface morphology demonstrated that the roughness was decreased with the process of multiple electroless. The coatings were compact and homogeneous as the deposition run was three. Here, the Sa (Sa illustrated Surface Roughness) value of coatings was 4.497 μm. The ideal conductivity of composite coatings can be obtained as the number of depositions was four. Electromagnetic shielding effectiveness reached average 90.69 dB in the frequency range from 300 kHz to 2.0 GHz. This study provides a new pathway for fabricating lightweight multilayer-structured electromagnetic interference shielding with controllable electromagnetic gradient and hydrophobic composite coatings-based wood.

Transparent and Flexible Electromagnetic Interference Shielding Materials by Constructing Sandwich AgNW@MXene/Wood Composites

“…In general, shielding effectiveness increases with thickness. Therefore, we utilize the normalized EMI SE/thickness to compare the shielding properties of AN@MX/TW composites and other reported wood-based composites. ,− As shown in Figure c, the AN@MX/TW composite with a thickness of about 1 mm reaches a maximum normalized SE/thickness of 44.96 dB/mm, which is much higher than most other reported values. The conductivity of AN@MX/TW composite can induce electrical heating with fast thermal response time (∼40 s for heating process and ∼60 s for cooling process) in Figure d,e.…”

Trends in Chemical Wood Surface Improvements and Modifications: A Review of the Last Five Years

“…They found that the disks' resistance would decrease from 12 Ω to 1 Ω within the first 5 minutes of electroless plating, that the hydrophobicity of the coated wood slightly increased, and that an electromagnetic shielding effectiveness between 55 Db and 65 Db could be achieved. Similar methods were also studied to coat poplar with Cu-Ni [168] and Ni-P [169] composites. A superhydrophobic wood surface was created by Wang et al by deposing copper on a wood substrate with a vacuum evaporator, followed by the growth of a silver layer through immersion in a AgNO 3 solution [170].…”

Preparation and Characterization of Electromagnetic Shielding Composites Based on Graphene-Nanosheets-Loaded Nonwoven Fabric

“…EM shielding materials are attracting great attention due to their specific function in overcoming EM interference (EMI) problems and are in demand for medical, aerospace, and military applications [2]. Many materials have been explored as EM shielding materials [3][4][5], and among them, EM shielding fabric is an important new kind of material or product for EM shielding because of its softness, breathability, and easy machining [6].…”