In the present study, the effect of size distribution of magnetite nanoparticles in a PVDF matrix on the magnetic properties of PVDF ? Fe 3 O 4 nanocomposites was experimentally and theoretically investigated. The size distribution of nanoparticles in polymer matrix and morphology of the nanocomposites were studied by the means of scanning electron microscopy and atomic force microscopy. It was found that when the Fe 3 O 4 nanoparticles are introduced into the polymer matrix, their coagulation takes place. The increase in the size of the particles depends on their concentration in the polymer matrix, the type of polymer (polar, non-polar, its viscosity, etc.), reaction temperatures, etc. In addition, when Fe 3 O 4 nanoparticles are introduced into the polymer network, the oxidation of the surface layer of particles occurs and the magnetic size decreases. Consequently, the reduced magnetic properties may also be observed. The hysteresis loops have been recorded in small magnetic field range. It was found that the magnetic hysteresis parameters depend on the size and concentration of Fe 3 O 4 nanoparticles. Theoretical calculations were compared with experimental results obtained from M(H) measurements. The reasons of differences between theoretical and experimental results have been explained.
Articles you may be interested inAg induced photo-generated charge trapping in nanostructured CdS/Cu2S thin film for photovoltaic applications AIP Conf.Abstract. 120 nm thick silver selenide thin films were prepared by thermal evaporation technique at a high vacuum better than 2x10 -5 mbar on well cleaned glass substrates at a deposition rate of 0.2 nm/sec. Silver selenide thin films were polycrystalline with orthorhombic structure. Ellipsometric spectra of silver selenide thin films have been recorded in the wavelength range between 300 nm and 700 nm. Optical constants like refractive index, extinction coefficient, absorption coefficient, and optical band gap of silver selenide thin film have been calculated from the recorded spectra. The refractive index of silver selenide has been found to vary between 1.9 and 2.1. The calculated optical band of silver selenide thin film is 1.7 eV.
Semiconducting silver selenide telluride (Ag 2 SeTe) ternary thin films of different thicknesses were synthesised employing thermal evaporation. The variation in structure of the films with thickness was estimated using X-ray diffraction studies. The thin films of lower thickness were amorphous, and at higher thickness, they were polycrystalline in nature with orthorhombic structure. The film crystallinity increased with increase in thickness. Increase in thickness beyond 320 nm caused the appearance of new peaks with increased intensity. The structural studies on typical Ag 2 Se 0?2 Te 0?8 system revealed that the stoichiometry of the bulk corresponded to that of the thin films. Micro-Raman spectra of the Ag 2 Se 0?2 Te 0?8 thin films were recorded and analysed. The optical image of Ag 2 Se 0?2 Te 0?8 thin films was also studied. The topography of the thin film was studied using atomic force microscopy. The results are presented.
Silver telluride (Ag2Te), I-VI semiconductor compound with potential applications in various advanced fields. Ag2Te nano films of thickness between 16 nm and 145 nm prepared by thermal evaporation technique at high vacuum better than 2x105 mbar. These films are found to exhibit polycrystalline nature with monoclinic structure from their XRD studies. The average particle size of these films are found to be around 24 nm using the Debye-Scherrer’s formula From AFM measurements, the average particle size is around 24 nm. The emission spectra of these films were recorded and analysed to determine its optical band gap. Optical band gap of Ag2Te varies from 1.6 eV to 1.8 eV with respect to their corresponding thicknesses of films.
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