期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 119, 期 21, 页码 11947-11957出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.5b01575
关键词
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资金
- ERDF
- EU [314212]
- InveNNta project - EU Programme for Cross-border Cooperation: Spain-Portugal
- Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- NIH [1S10RR023656-01A1]
- I2C Plan (Xunta de Galicia, Spain)
A series of colloidal MxFe3-xO4 (M = Mn, Co, Ni; x = 0-1) nanoparticles with diameters ranging from 6.8 to 11.6 nm was synthesized by hydrothermal reaction in aqueous medium at low temperature (200 degrees C). Energy-dispersive X-ray microanalysis and inductively coupled plasma spectrometry confirm that the actual elemental compositions agree well with the nominal ones. The structural properties of the obtained nanoparticles were investigated by powder X-ray diffraction, Raman spectroscopy, Mossbauer spectroscopy, X-ray and neutron pair distribution function analysis, and electron microscopy. The results demonstrate that our synthesis technique leads to the formation of chemically uniform single-phase solid solution nanoparticles with cubic spinel structure, confirming intrinsic doping. The local structure of the Fe3O4 NPs is distorted with respect to the cubic inverse-spinel structure, while chemical substitution of Fe by Mn or Ni partially eliminates the local distortions. Magnetic studies showed that, in comparison to nondoped Fe3O4, the saturation magnetization (M-s) of MxFe3-xO4 (M = Mn, Ni) decreases With increasing dopant concentration; while Co-doped samples showed similar M-s. On the other hand, whereas Mn- and Ni-doped nanoparticles exhibit superparamagnetic behavior at room temperature, ferrimagnetism emerges for CoxFe3-xO4 nanoparticles, which can be tuned by the level of Co doping.
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