TỔNG HỢP HẠT NANO Fe3O4 TRÊN CACBON XỐP THU ĐƯỢC TỪ VỎ TRẤU ĐỂ TĂNG CƯỜNG HẤP THỤ VI SÓNG

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Tác giả: Dinh Vi Le, Thi Thanh Nguyen, Tran Ha Nguyen, Van Tuan Nguyen, Vu Tung Nguyen, Van Thin Pham, Quang Dat Tran

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Physics and Chemical Engineering, 2023

Mô tả vật lý: tr.27

Bộ sưu tập: Báo, Tạp chí

ID: 347049

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In this study, a straightforward process was employed to synthesize Fe3O4 nanoparticles-decorated porous carbon derived from rice husk waste (Fe3O4/C). The composite material was made by using pyrolysis and then coprecipitation. Fe3O4 nanoparticles were dispersed evenly across the surface of a porous carbon structure made from rice husks (PC) in three dimensions (3D). The highly graphitized porous carbon framework makes the tracks for electromagnetic waves that propagate longer and increases the loss of conductivity. With its unique structure and the effects of great attenuation and good impedance matching, Fe3O4/C is much better at absorbing microwaves than pure porous carbon. Most samples have a minimum reflection loss (RL) of less than -10 dB (90% reduction) over a wide range of electromagnetic frequencies (3.6 - 18.0 GHz) when the thickness of the absorber varies from 1.5 - 4.0 mm. With a thickness of 3.0 mm, the best RL is -70.8 dB, and with a thin thickness of 1.5 mm, the effective absorption bandwidth (EAB) is 14.4 GHz. According to the findings of this study, the use of Fe3O4/C material for electromagnetic wave absorption applications holds great promise due to the low cost and extensive benefits of the preparation process, as well as its excellent electromagnetic absorption performance.Trong nghiên cứu này, một quy trình hiệu năng đã được sử dụng để tổng hợp cacbon xốp được phủ bởi các hạt nano Fe3O4 có nguồn gốc từ phế thải vỏ trấu (Fe3O4/C). Vật liệu composite được tạo ra bằng phương pháp nhiệt phân và đồng kết tủa. Các hạt nano Fe3O4 được phân tán đều trên bề mặt cấu trúc ba chiều của cacbon xốp. Khung cacbon xốp được graphit hóa cao tạo ra các rãnh cho sóng điện từ lan truyền lâu hơn và làm tăng khả năng mất độ dẫn điện. Với cấu trúc độc đáo và hiệu ứng suy hao lớn, kết hợp trở kháng tốt, vật liệu Fe3O4/C hấp thụ vi sóng tốt hơn nhiều so với cacbon xốp. Hầu hết các mẫu có suy hao phản xạ (RL) nhỏ hơn -10 dB (giảm 90%) trên dải tần số điện từ rộng (3,6 - 18 GHz) khi độ dày của mẫu hấp thụ thay đổi từ 1,5 - 4,0 mm. Với độ dày 3,0 mm, RL tốt nhất là -70,8 dB và với độ dày của mẫu là 1,5 mm, băng thông hấp thụ hiệu quả là 14,4 GHz. Theo kết quả của nghiên cứu này, việc sử dụng vật liệu Fe3O4/C cho các ứng dụng hấp thụ sóng điện từ có nhiều triển vọng do chi phí thấp và lợi ích mở rộng của quy trình điều chế cũng như hiệu suất hấp thụ của chúng.

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