Preparation and Properties of Various Magnetic Nanoparticles

Sensors

Jana Drbohlavova³  Radim Hrdy³  Vojtech Adam²  Rene Kizek²  Oldrich Schneeweiss¹ 

[1] Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zizkova 22, 616 62 Brno, Czech Republic; E-Mail:;Department of Chemistry and Biochemistry, Faculty of Agronomy, Mendel University of Agriculture and Forestry, Zemědělská 1, 613 00 Brno, Czech Republic; E-Mails:;Department of Microelectronics, Faculty of Electrical Engineering and Communication, Brno University of Technology, Údolní 53, 602 00 Brno, Czech Republic; E-Mails:

关键词: Magnetic nanoparticles;    iron oxide;    gadolinium nanoparticles;    silica coating;   

DOI  :  10.3390/s90402352

来源: mdpi

【 摘 要 】

The fabrications of iron oxides nanoparticles using co-precipitation and gadolinium nanoparticles using water in oil microemulsion method are reported in this paper. Results of detailed phase analysis by XRD and Mössbauer spectroscopy are discussed. XRD analysis revealed that the crystallite size (mean coherence length) of iron oxides (mainly γ-Fe₂O₃) in the Fe₂O₃ sample was 30 nm, while in Fe₂O₃/SiO₂ where the ε-Fe₂O₃ phase dominated it was only 14 nm. Gd/SiO₂ nanoparticles were found to be completely amorphous, according to XRD. The samples showed various shapes of hysteresis loops and different coercivities. Differences in the saturation magnetization (MS) correspond to the chemical and phase composition of the sample materials. However, we observed that MS was not reached in the case of Fe₂O₃/SiO₂, while for Gd/SiO₂ sample the MS value was extremely low. Therefore we conclude that only unmodified Fe₂O₃ nanoparticles are suitable for intended biosensing application in vitro (e.g. detection of viral nucleic acids) and the phase purification of this sample for this purpose is not necessary.

【 授权许可】

CC BY   
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