Synthesis of nano Fe3O4@SiO2 core/shell with high superparamagnetism
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Abstract
The main aim of this study is to synthesize and evaluate the physical chemistry, magnetic properties of Fe3O4 and Fe3O4@SiO2 core/shell nanoparticles using a simple and economical process. Fe3O4@SiO2 core/shell nanoparticles were synthesized from Fe3O4 nanoparticles formed by co-precipitation method and covered with SiO2 layer using silane molecules from tetraethyl orthosilicate (TEOS) as phase transition agent, and a strong base coating medium (NaOH). The results of X-ray diffraction analysis showed that Fe3O4 nanoparticles were high crystallinity. Analysis results of scanning electron microscopy and transmission electron microscopy showed that the obtained ferromagnetic nanoparticles had octagonal shape with fairly uniform size falling about 20 nm including SiO2 coating. Fourier modified infrared analysis for Fe3O4@SiO2 material showed that Si-O-Si, O-Si-O, Fe-O, Fe-O-Si peaks appear on the spectrum demonstrated the existence of silica on Fe3O4 nanoparticle surface. The superparamagnetic properties of the material was confirmed by the vibrating sample magnetometer results and the superparamagnetism (VSM) of Fe3O4 and Fe3O4@SiO2 90.54 emu/g and 68.42 emu/g, respectively.
Tóm tắt
Mục đích chính của nghiên cứu này là tổng hợp và đánh giá tính chất hóa lý, từ tính của vật liệu nano Fe3O4 và Fe3O4@SiO2 có cấu trúc lõi−vỏ, với quá trình thực hiện đơn giản, tiết kiệm. Vật liệu Fe3O4@SiO2 được tổng hợp từ hạt nano Fe3O4 được tạo thành bằng phương pháp đồng kết tủa và bao phủ bởi lớp SiO2 bằng cách sử dụng các phân tử silane từ tetraethyl orthosilicate (TEOS) làm tác nhân chuyển pha và môi trường phủ là một base mạnh (NaOH). Kết quả phân tích nhiễu xạ tia X cho thấy hạt nano Fe3O4 có độ kết tinh cao. Kết quả phân tích hiển vi điện tử quét và hiển vi điện tử truyền qua chỉ ra rằng hạt nano sắt từ thu được có hình khối bát giác với kích thước khá đồng đều khoảng 25 nm kể cả lớp phủ SiO2. Phân tích hồng ngoại biến đổi Fourier cho vật liệu Fe3O4@SiO2 thấy được các mũi Si-O-Si, O-Si-O, Fe-O, Fe-O-Si xuất hiện trên phổ đã minh chứng cho sự tồn tại của silica trên bề mặt hạt nano Fe3O4. Tính siêu thuận từ của vật liệu được khẳng định thông qua kết quả từ kế mẫu rung và độ từ hóa (VSM) của Fe3O4 và Fe3O4@SiO2 lần lượt là 90,54 emu/g và 68,42 emu/g.
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