CẤU TRÚC VÀ TÍNH CHẤT TỪ CỦA CÁC HỆ HẠT NANO TỔ HỢP Fe3O4@CoFe2O4=STRUCTURE AND MAGNETIC PROPERTIES OF Fe3O4/CoFe2O4 COMPOSITES NANOPARTICLES SYSTEMS

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Tác giả: Hùng Mạnh Đỗ, Thị Hồng Phong Lê, Thị Ngọc Anh Nguyễn, Hồng Nam Phạm

Ngôn ngữ: vie

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Thông tin xuất bản: Tạp chí Khoa học và Công nghệ - Đại học Thái Nguyên, 2024

Mô tả vật lý: tr.52 - 59

Bộ sưu tập: Metadata

ID: 484508

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Các hệ hạt nano tổ hợp hai thành phần hiện đang được nghiên cứu và phát triển tại nhiều phòng thí nghiệm nhờ vào những tiến bộ trong tổng hợp hóa học. Vật liệu nano tổ hợp hai thành phần nền Fe3O4 dạng lõi-vỏ đã cho thấy sự cải thiện về một số tính chất so với các thành phần vật liệu đơn lẻ. Trong nghiên cứu này, vật liệu nano tổ hợp từ tính hai thành phần Fe3O4 và CoFe2O4 với các độ dày vỏ khác nhau đã được tổng hợp bằng phương pháp phát triển hạt kết hợp phân hủy nhiệt. Kết quả từ giản đồ nhiễu xạ tia X (XRD) và ảnh hiển vi điện tử quét truyền qua kết hợp phổ tán xạ năng lượng tia X dạng bản đồ (STEM-EDX Mapping) cho thấy các mẫu nano tổ hợp đã được hình thành với cấu trúc hình thái học dạng lõi-vỏ Fe3O4@CoFe2O4. Kích thước hạt lõi Fe3O4 khoảng 18 nm và độ dày vỏ CoFe2O4 thay đổi từ 2-9 nm. Phép đo từ độ, được thực hiện trên hệ từ kế mẫu rung (VSM) với hai cách chuẩn bị mẫu khác nhau là nén bột bình thường và ghim hạt trong nền sáp, cho thấy có sự ảnh hưởng của cả tương tác giữa các hạt và tương tác nội hạt giữa lớp lõi Fe3O4 và vỏ CoFe2O4 lên tính chất từ. Bên cạnh đó, các kết quả đo từ cũng cho thấy tính chất từ bị ảnh hưởng bởi độ dày lớp vỏ CoFe2O4.Composite two-component nanoparticle systems are being researched and developed in many laboratories thanks to advances in chemical synthesis. Core-shell Fe3O4-based composite two-component nanomaterials have shown improvements in several properties compared to single-component materials. In this study, composite nanomaterials containing two magnetic components including Fe3O4 and CoFe2O4 with different shell thicknesses were synthesized using seed-mediated growth combined with thermal decomposition method. Results from X-ray diffraction (XRD) patterns and scanning transmission electron microscopy combined with energy-dispersive X-ray spectroscopy mapping (STEM-EDX Mapping) showed that the nanocomposite materials were formed with core-shell morphology of Fe3O4@CoFe2O4. The Fe3O4 core particle size is about 18 nm and the CoFe2O4 shell thickness varies from 2-9 nm. Magnetic measurements performed using both normal powder pressing and particle embedding in a wax matrix indicated that both interparticle interactions and intraparticle interactions between the Fe3O4 core and the CoFe2O4 shell influence the magnetic properties. Additionally, the magnetic properties were also affected by the shell thickness.

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