CAJ | 학술논문

室温下通过NaBH4还原FeCl2溶液,在实验过程中加入聚丙烯酸（PAA）作为表面活性剂,制备了粒径大小为3～5nm的Fe纳米颗粒,并在不同温度下对得到的颗粒进行退火。对比了在不同温度下退火对样品的结构及磁性能的影响。结果表明,通过化学还原法制备的Fe纳米颗粒为非晶态,其磁性表现为超顺磁和铁磁的混磁态,随着退火温度的增加Fe纳米颗粒的晶化程度越来越高,其饱和磁化强度和矫顽力逐渐增大,磁性由混磁态逐渐向铁磁态转变。
실온하통과NaBH4환원FeCl2용액,재실험과정중가입취병희산（PAA）작위표면활성제,제비료립경대소위3～5nm적Fe납미과립,병재불동온도하대득도적과립진행퇴화。대비료재불동온도하퇴화대양품적결구급자성능적영향。결과표명,통과화학환원법제비적Fe납미과립위비정태,기자성표현위초순자화철자적혼자태,수착퇴화온도적증가Fe납미과립적정화정도월래월고,기포화자화강도화교완력축점증대,자성유혼자태축점향철자태전변。
Fe nanoparticles were prepared by chemical reduction method. The precursor of FeC12 was reducing by NaBH4 at room temperature. During the reaction, polyacrylic acid （PAA） was added to the reagent as the surfactant. The nanoparticle size is shaped in the range of 3-Snm when the pH of the reagent is 6. The nanoparticles were then annealed at different temperature in Ar. The influence of annealing temperature on the structure and magnetic properties of Fe nanoparticles were studied. As a result,the Fe nanoparticles which prepared by chemical reduction method are almost amorphous. The magnetic characteristic of the Fe nanoparticles is metamagnetic which consists of superparamagnetic and ferromagnetic. Crystalline degree of Fe nanoparticles are improved as the annealing temperature increase. The magnetic characteristic of Fe nanoparticles is gradually transformed from metamagnetic to the ferromagnetic.