TỔNG HỢP VẬT LIỆU CHUỖI NANO NiCo2O4 VỚI ĐẶC TÍNH HẤP THỤ VI SÓNG HIỆU NĂNG

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Tác giả: Tuấn Linh Nguyễn, Văn Cường Nguyễn, Quang Đạt Trần

Ngôn ngữ: vie

Ký hiệu phân loại:

Thông tin xuất bản: Journal of Science and Technique: Section on Physics and Chemical Engineering, 2024

Mô tả vật lý: tr.88

Bộ sưu tập: Metadata

ID: 439217

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Nanochains-like NiCo2O4 material was synthesized via the hydrothermal method utilizing D-glucose template to facilitate microwave absorption across the frequency range of 2 - 18 GHz. Comprehensive characterization employing various analytical techniques was employed to investigate the structural, microstructural, magnetic, and electromagnetic properties. Leveraging the presence of Oxalic acid and D-Glucose, a nanochain morphology comprising spherical nanoparticles (400 - 600 nm) was achieved. The resultant NiCo2O4 demonstrated a single-phase structure and exhibited the reflection loss (RL) value lower than -20 dB was up to 5.9 GHz within the Ku (12 - 18 GHz) frequency band, at a matching thickness of 2.0 mm. Remarkably, the optimal reflection loss reached -52.5 dB at 15 GHz for samples with a thickness of 2.0 mm, while the widest effective bandwidth extended up to 14.1 GHz for samples with a thickness of 5.0 mm. The superior microwave absorption performance of the chains-like NiCo2O4 powders was attributed to the synergistic interplay between their dielectric and magnetic properties, facilitating excellent impedance matching. These results indicate that NiCo2O4 chains-like powders have great promise as a material for microwave absorption.Vật liệu NiCo2O4 dạng chuỗi nano được tổng hợp thông qua phương pháp thủy nhiệt sử dụng D-glucose làm chất đệm để tạo điều kiện cho hấp thụ sóng vi sóng trên dải tần từ 2 đến 18 GHz. Từ đó, các phương pháp phân tích khác nhau đã được thực hiện để nghiên cứu cấu trúc, cấu trúc vi mô, tính từ và đặc trưng điện từ của vật liệu. Nhờ sử dụng axit oxalic và D-glucose, cấu trúc chuỗi bao gồm các hạt nano cầu (400 - 600 nm) đã được tổng hợp thành công. Vật liệu NiCo2O4 có cấu trúc tinh thể đơn pha và có tổn hao phản xạ (RL) thấp hơn -20 dB lên đến 5,9 GHz trong dải tần Ku (12 - 18 GHz), ở mẫu có bề dày 2,0 mm. Đáng chú ý, tổn hao phản xạ tối ưu đạt đến -52,5 dB tại 15 GHz cho các mẫu với độ dày là 2,0 mm, trong khi băng thông hiệu quả rộng nhất kéo dài lên đến 14,1 GHz cho các mẫu với độ dày là 5,0 mm. Hiệu suất hấp thụ vi sóng vượt trội của vật liệu NiCo2O4 dạng chuỗi nano là nhờ sự tương tác tương hỗ giữa các đặc tính điện môi và từ tính của chúng, tạo điều kiện cho khả năng phối hợp trở kháng tối ưu. Những kết quả này chỉ ra rằng các loại bột dạng chuỗi NiCo2O4 có nhiều triển vọng làm vật liệu hấp thụ vi sóng.

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