In Situ Formation of Fe 3 O 4 /La 2 O 3 Coating on the Surface of Carbonaceous Nonwoven to Improve Its Electromagnetic W
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https://doi.org/10.1007/s11664-020-08437-8 2020 The Minerals, Metals & Materials Society
In Situ Formation of Fe3O4/La2O3 Coating on the Surface of Carbonaceous Nonwoven to Improve Its Electromagnetic Wave Absorption Property XIAOYUN LONG,1,2,4 LIFEN HE,3 WEI YE,1,2 and QILONG SUN1,2 1.—College of Textiles and Clothing, Nantong University, Nantong, China. 2.—National and Local Joint Engineering Research Center of Technical Fiber Composites for Safety and Protection, Nantong University, Nantong, China. 3.—Nantong Textile and Silk Industry Technology Research Institute, Nantong, China. 4.—e-mail: [email protected]
A coating consisting of Fe3O4/La2O3 mixed particles has been prepared and applied to the surface of carbonaceous nonwoven (CNW) using immersion and calcination processes to improve its electromagnetic (EM) wave absorption property. The surface phase composition, surface morphology, and surface chemical composition of the CNW and the effect of the coating preparation parameters on its EM wave-absorbing property were investigated. The results revealed that the coating was uniformly deposited on the surface of CNW through immersion and calcination. Moreover, the EM wave-absorbing property could be regulated by adjusting the molar mass ratio of FeCl3 to LaCl3, total molar mass, and calcination temperature. The modified CNW obtained with a molar mass ratio of FeCl3 to LaCl3 of 8:2, total molar mass of 0.625 mol/ L, and calcination temperature of 750C showed excellent EM wave-absorbing property with an effective bandwidth of 5.9 GHz and lowest reflection loss of 31.3 dB for a thickness of 3 mm. Key words: Carbonaceous nonwoven, Fe3O4/La2O3 coating, EM wave-absorbing material
INTRODUCTION With the advent of the information age, electronic products and equipment, such as routers, mobile phones, and computers, are widely utilized in our daily lives due to their convenience.1–3 However, the electromagnetic (EM) radiation produced by these devices causes several issues that might adversely affect human health.4 In addition, the strong EM radiation emitted by high-power electronic equipment (e.g., signal towers and base stations) causes interference with the operation of other equipment. The current methods used to solve such EM pollution include EM shielding and the use of microwaveabsorbing materials.5,6 Many researchers7–9 have
(Received June 16, 2020; accepted August 20, 2020)
focused on EM wave-absorbing materials to avoid secondary EM pollution. Traditional microwave-absorbing materials can be classified into two types: dielectric (e.g., graphene, carbonaceous material, SiC, manganese oxide, and polyaniline) and magnetic materials (e.g., carbonyl iron, Fe, Co, and Ni10). Carbonaceous materials,11,12 which are a kind of electric loss-type EM wave-absorbing materials, possess good EM wave-absorbing property due to their strong electric loss capacity caused by high conductivity. These materials play an important role in the field of EM wave protection.13 However, the complex permittivity of carbonaceous ma
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