CAJ | 학술논문

以Fe(acac)_3为原料,乙二醇、聚乙二醇1000和聚乙二醇5000为还原剂和溶剂,在温和的溶剂热的条件下制备了不同尺寸的顺磁性Fe_3O_4纳米颗粒.利用X射线衍射(XRD)、光电子能谱(XPS)、透射电子显微镜(TEM)和磁性测量技术对制备的Fe_3O_4纳米颗粒的结构、形貌、磁性能进行了表征测试.结果发现,聚乙二醇分子链的长度对Fe_3O_4 纳米颗粒的平均粒径大小、结晶度和饱和磁化强度均有重要影响.以乙二醇、聚乙二醇1000和聚乙二醇5000为还原剂制备的Fe_3O_4 纳米颗粒的尺寸分别为2～3 nm、5 nm 和7～8 nm;相应的纳米Fe_3O_4 颗粒饱和磁化强度分别为55.2、61.5和81.3 emu/g;同时结晶度也随分子链的增加而增加.随分子链长度的增加,还原剂还原性的逐渐增加是导致Fe_3O_4 纳米颗粒平均粒径大小、结晶度和饱和磁化强度逐渐增大的重要因素.
이Fe(acac)_3위원료,을이순、취을이순1000화취을이순5000위환원제화용제,재온화적용제열적조건하제비료불동척촌적순자성Fe_3O_4납미과립.이용X사선연사(XRD)、광전자능보(XPS)、투사전자현미경(TEM)화자성측량기술대제비적Fe_3O_4납미과립적결구、형모、자성능진행료표정측시.결과발현,취을이순분자련적장도대Fe_3O_4 납미과립적평균립경대소、결정도화포화자화강도균유중요영향.이을이순、취을이순1000화취을이순5000위환원제제비적Fe_3O_4 납미과립적척촌분별위2～3 nm、5 nm 화7～8 nm;상응적납미Fe_3O_4 과립포화자화강도분별위55.2、61.5화81.3 emu/g;동시결정도야수분자련적증가이증가.수분자련장도적증가,환원제환원성적축점증가시도치Fe_3O_4 납미과립평균립경대소、결정도화포화자화강도축점증대적중요인소.
Paramagnetic Fe_3O_4 nanoparticle with different particle sizes were prepared under mild solvothermal conditions using Fe(acac)_3 as the precursor, and ethylene glycol, poly (ethylene glycol)(PEG)1000 and PEG 5000 as the reducing agent and solvent. The as-synthesized Fe_3O_4 nanoparticles were characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and magnetic measurement. The results of the characterization show that the chain length of PEG plays an important role in the crystallinity, particle size, and magnetic property of the Fe3_O_4 nanoparticles. The diameter of the Fe_3O_4 particles is 2 nm-3 nm, 5 nm and 7 nm-8 nm prepared by ethylene glycol, PEG 1000, and PEG 5000, respectively, and correspondingly, the magnetic saturation values of the Fe_3O_4 particles are 55.2, 61.5 and 81.3 emu/g. At the same time, the crystallinity is remarkably enhanced with the increase of polymer chain length of PEG. The changes in the properties of the Fe_3O_4 nano particles could be attributed to the increase of the reductive ability with the increase of chain length of PEG.