Microwave Absorption and the Magnetic Hyperthermia Applications of Li(0.3)Zno(3)Co(0.1)Fe(2.3)O(4) Nanoparticles in Multiwalled Carbon Nanotube Matrix

摘要

Nanoparticles of Li0.3Zn0.3Co0.1Fe2.3O4 (LZC) were prepared by the sol gel method and dried in a furnace at,200 degrees C. The dried sample was annealed at 500, 600, 700, and 800 degrees C for 5 h each. Rietveld analysis of X-ray diffraction patterns confirms the cubic Fd (3) over barm phase formation with lattice parameters ranged from 8.376 up to 8.390 angstrom and allows the crystallite sizes (d(cryst)) to be estimated. To enhance microwave (MW) absorption as well as the effectiveness for hyperthermia treatment, nanoparticles are taken in the matrix of multiwalled carbon nanotubes (MWCNTs) and the morphology of the so prepared samples (LZC@MWCNT) was studied by scanning electron microscopy and transmission electron microscopy analyses. Both static and dynamic magnetic properties were investigated on the samples of LZC nanoparticles and compared to those of the samples of LZC@MWCNT. The samples annealed at 500, 600, and 800 degrees C are excellent candidates in cancer treatment as ac magnetic heating analysis shows that the hyperthermia temperature (42 degrees C) was successfully achieved for an applied ac magnetic field of 420 Oe and 300 kHz frequency. MW absorption study also reveals that the samples of LZC@ MWCNT could be used as a potential MW absorbing material for which a maximum reflection loss (RL) of similar to-21 dB was achieved at a frequency of 15.27 GHz for only 1 mm layer thickness.