超顺磁Fe<sub>3</sub>O<sub>4</sub>@PDA核-壳结构纳米粒子的制备及表征

超顺磁Fe₃O₄@PDA核-壳结构纳米粒子的制备及表征

摘要: 利用多元醇高温热解法和溶液氧化法制备超顺磁四氧化三铁聚多巴胺核-壳结构纳米粒子(Fe₃O₄@PDA)。采用 X 射线衍射(XRD)、透射电子显微镜(TEM)、动态光散射(DLS)、傅里叶转换红外光谱(FT-IR)和热重分析(TG)等对 Fe₃O₄@PDA 的结构、形貌和组成进行表征。采用综合物性测试系统(PPMS)对样品的磁性能进行表征。结果表明:Fe₃O₄@PDA 的尺寸可以通过氨水与多巴胺的物质的量之比和反应时间进行调控;当Fe₃O₄@PDA 中Fe₃O₄的质量分数约为5%时,具有超顺磁性,磁饱和强度为3.8 emu/g,比理论值高出36%。

Abstract: Superparamagnetic Fe₃O₄@PDA core-shell structure nanoparticles were synthesized via polyol thermo decomposition and solution oxidation.The structure,morphology and component were characterized by X-Ray Diffraction (XRD),Transmission Electron Microscopy (TEM),Fourier Transform Infrared Spectroscopy (FT-IR),and Thermogravimetric Analysis (TG),etc.The magnetic properties of the samples were measured using physical properties measurement system (PPMS).Results showed that the size of Fe₃O₄@PDA could be controlled by adjusting the molar ratio of ammonia to DA and reaction time.When the mass fraction of Fe₃O₄ in Fe₃O₄@PDA was about 5%,Fe₃O₄@PDA was superparamagnetic and the saturation magnetization was 3.8 emu/g,which was 36% higher than the theoretical value.