摘要
采用聚丙烯酰胺凝胶法制备了NiFe2O4纳米颗粒,利用XRD、SEM、紫外-可见漫反射光谱、FTIR、XPS、VSM等对样品进行了表征分析。结果表明:分别以EDTA和乙酸作络合剂时,在600℃烧结温度下可制得单相NiFe2O4纳米颗粒;两个样品的颗粒形貌较为规整,主要以类球形为主,粒度分布较为均匀,平均粒径分别为55 nm和75 nm。根据紫外-可见漫反射光谱求得样品的带隙为1.85 eV。Fe 2p3/2和Ni 2p3/2的XPS谱分析表明:样品为反尖晶石型结构,其化学通式可表示为(Fe3+)[Ni2+Fe3+]O4。磁滞回线测量结果表明:样品具有良好的软磁特性,颗粒尺寸较小的样品其饱和磁化强度、剩余磁化强度和矫顽力相对较小。
A polyacrylamide gel route was used to prepare NiFe204 nanoparticles. The prepared samples were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, ultraviolet-visible diffuse reflectance spectroscopy, fourier transform infrared spectroscopy （ FTIR）, X-ray photoelectron spectroscopy （XPS）, and vibrating sample magnetometer （VSM）. It is demonstrated that single-phase NiFe204 nanoparticles can be prepared separately using ethylenediamine-tetraacetic acid （EDTA） and acetic acid as the chelating agent at a calcining temperature of 600 ℃. The two as-prepared samples have regular spherical particle shapes and uniform particle sizes with an average diameter of 55 nm and 75 nm, respectively. The energy bandgap of the samples is estimated to be 1.85 eV by ultraviolet-visible diffuse reflectance spectroscopy. Fe 2p3/2 and Ni 2p3/2 XPS spectra reveal that the samples have an inverse spinel- type structure with the chemical formula （ Fe3 ＋ ） [ Ni2 ＋ Fe3 ＋ ] 04. Magnetic hysteresis loop measurementsindicate that the samples exhibit good soft magnetic properties, and their saturation magnetization, remanent magnetization and coercivity have a decrease with decrease in particle size.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第2期316-321,350,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(50962009
51262018)
甘肃省自然科学基金(1010RJZA041)
兰州理工大学红柳杰出人才培养计划(J201205)
关键词
铁酸镍
纳米颗粒
聚丙烯酰胺凝胶法
XPS
磁性
nickel ferrite
nanoparticles
polyacrylamide gel method
XPS
magnetic properties
