ABSTRACT

Ferric nitrate Fe(NO₃)₃ ⋅9H₂O as a precursor and Ethylene Glycol as a solvent were used to prepare iron oxide nanoparticle via sol gel method. X-ray diffraction (XRD) study of IONPs at different calcination temperatures to determine the size of the crystallite was performed using various methods of calculation: Scherrer, Williamson-Hall (W-H), Halder-Wagner (H-W) and Size-Strain plot (SSP). The Scherrer and H-W methods reveal that the crystallite size decreases in the presence of a single phase (γ-Fe₂O₃) at lower temperature, as the contribution of other-phase (α-Fe₂O₃) increases size varies, but again decreases as the material converts to a single phase, while with temperature, the Size-Strain Plot and Halder-Wagner Method show increased crystallite size. FE-SEM and HR-TEM investigations confirm that the synthesized IONPs are spherical. EDX spectra and FTIR analyses have shown that synthesized particles are pure iron oxide nanoparticles. The average particle size calculated using different models below than 20 nm.

摘要

以硝酸铁Fe(NO ₃ ) ₃ ⋅9H ₂ O为前驱体，乙二醇为溶剂，通过溶胶凝胶法制备氧化铁纳米粒子。使用各种计算方法对 IONP 在不同煅烧温度下的 X 射线衍射 (XRD) 研究以确定微晶的尺寸：Scherrer、Williamson-Hall (WH)、Halder-Wagner (HW) 和尺寸-应变图 ( SSP）。Scherrer 和 HW 方法表明，在较低温度下存在单相 (γ-Fe ₂ O ₃ ) 时，微晶尺寸减小，因为其他相 (α-Fe ₂ O ₃) 增加尺寸变化，但随着材料转化为单相再次减小，而随着温度的升高，尺寸-应变图和 Halder-Wagner 方法显示微晶尺寸增加。FE-SEM 和 HR-TEM 研究证实合成的 IONP 是球形的。EDX 光谱和 FTIR 分析表明合成的颗粒是纯氧化铁纳米颗粒。使用不同模型计算的平均粒径小于 20 nm。