海南师范大学学报（自然科学版）2025，Vol.38Issue(2)：177-182,6.DOI:10.12051/j.issn.1674-4942.2025.02.008
超顺磁性Fe3O4纳米颗粒的制备与表征
Preparation and Characterization of Superparamagnetic Fe3O4 Nanoparticles
摘要
Abstract
Small Magnetite(Fe3O4)nanoparticles with superparamagnetic properties are widely used in biomedical applica-tions such as magnetic resonance and targeted drug carriers,as well as in magnetic spintronics.Using the sol-gel method with ferrous sulfate heptahydrate(FeSO4•7H2O)as the sole iron source and potassium hydroxide(KOH)to provide an alka-line environment,Fe3O4 nanoparticles with an average particle size of 10-25 nm were prepared by varying the concentration of the reactants and the reaction solvent(ethylene glycol solution).Fe3O4 particles were characterized using X-ray diffractometer(XRD),Raman spectrometer(Raman),transmission electron microscope(TEM),vibrating sample magnetometer(VSM),etc.The effects of the concentration of the reactants and the ratio of the reaction solvents on the size of the Fe3O4 nanoparticles were obtained,and the reversibility of the systems was also analyzed through the use of the first-order reversal curves.It was verified that the Fe3O4 nanoparticle systems with smaller average particle sizes had higher superparamagnetic ratios.With the increase of the proportion of ethylene glycol,the mean size of Fe3O4 particles first increased and then decreased.When V(H2O):V(EG)=70:30,the average particle size was about 14 nm,which indicated that a certain proportion of ethylene glycol hindered the growth of the particles.At the same time,the particle size decreased to 10 nm with the addition of excess OH⁻.With the increase of particle size,the coercivity increased rapidly from almost zero to 45 Oe at 17 nm and 60 Oe at 25 nm,ac-companied by the change of the particle domain structure.The small coercivity and high average reversible percentage(96％)of the particle systems with particle sizes less than or equal to 14 nm verified a high superparamagnetic percentage.关键词
Fe3O4/超顺磁/纳米颗粒,可逆百分比Key words
Fe3O4/superparamagnetic/nanoparticles/reversible percentage引用本文复制引用
陈小蔓,张艺玮,宋恒博,李功捷,孙丽..超顺磁性Fe3O4纳米颗粒的制备与表征[J].海南师范大学学报（自然科学版）,2025,38(2):177-182,6.基金项目
国家自然科学基金(12164016) （12164016）
海南省自然科学基金(521QN0885) （521QN0885）
海南师范大学榕树基金(RSHY20231165810S、RSYH20231165820S) （RSHY20231165810S、RSYH20231165820S）
海南省院士创新平台科研项目(YSPTZX202207) （YSPTZX202207）
