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.

中文翻译：

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用于电磁干扰屏蔽的多层结构木化学镀铜-镍复合涂层

通过简单的多化学镀铜镍（Cu-Ni）方法制备了在木质表面上具有可控电磁梯度的轻型多层结构电磁干扰屏蔽复合涂层。研究了复合涂层的表面形貌，电导率，疏水性和电磁屏蔽效果。随着沉积次数的增加，复合涂层的表面粗糙度和电导率提高。表面形貌表明，粗糙度随着多次化学镀过程而降低。涂层是致密且均匀的，因为沉积过程为三次。在此，涂层的Sa（Sa所示的表面粗糙度）值为4.497μm。复合涂层的理想导电率可以通过沉积四次获得。在300 kHz至2.0 GHz的频率范围内，电磁屏蔽效率平均达到90.69 dB。这项研究为制造具有可控电磁梯度和疏水性复合涂料基木材的轻质多层结构电磁干扰屏蔽提供了一条新途径。