Waterborne polyurethane composites with asymmetric multilayered electromagnetic gradient for absorption dominated electromagnetic interference shielding

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.469

Hao Sun , Xudong Fang , Chen Wu , Ziyan Fang , Qiang Kang , Zhengcai Zhao , Zhongkai Zhang , Bian Tian , Libo Zhao , Maeda Ryutaro

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引用次数: 0

Abstract

Absorption dominated electromagnetic interference (EMI) shielding composites have high EMI shielding effectiveness (SE) while eliminating electromagnetic (EM) radiation to the environment, making them vital for solving EM pollution problems. However, there is a lack of composite with both strong EM wave absorption and high EMI SE. Herein, we report an ingenious layer-by-layer (LBL) casting method to prepare waterborne polyurethane/iron oxide/carbon nanotube/reduced graphene oxide (WPU/Fe₃O₄/CNT/rGO, WFCR) EM wave absorber. A positive conductive gradient and a negative magnetic gradient are formed by controlling the composition, and EM wave absorption is enhanced by the asymmetric EM gradient structure. Subsequently, EM wave undergoes the process of "absorption-reflection-reabsorption" induced by the Ag reflection layer prepared by screen printing. Caused by the plentiful EM wave loss mechanism including magnetic loss, interface polarization and conductive loss in Ag-WFCR composites, EMI SE reaches 38.96 dB, and the absorption coefficient (A) value is 0.68, which intuitively demonstrates that the EMI shielding mechanism is dominated by absorption. In addition, the high tensile strength of 9.25 MPa and the compressive strength of 556.2 kPa also indicates its good mechanical properties. These excellent performances demonstrate the promising application of Ag-WFCR composites in EMI shielding and thermal management applications as well as in wearable electronics.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.