The effect of growth temperature on magnetic properties of electrocrystallized iron oxide nanoparticles in the presence of β-cyclodextrin

• Main Author: Mosivand, Saba
• Format: Conference Proceeding
• Language: English
• Subjects: Crystal structure; Crystallites; Crystallization; Cyclodextrins; Diffraction patterns; Image resolution; Image transmission; Infrared spectroscopy; Iron oxides; Magnetic measurement; Magnetic properties; Magnetization; Morphology; Mossbauer spectroscopy; Nanoparticles; Organic chemistry; Particle size; Spectrum analysis; Striations; Tuning; X-ray diffraction
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.5110129

Electrocrystallized iron oxide nanoparticles were prepared by a chronoamperometric technique in the presence of b-cyclodextrin. The electrocrystallization process was performed with two iron electrodes in an electrolytic bath. The effect of bath temperature on structural properties and magnetization of the nanoparticles was studied. Fourier trans- formation infrared (FT-IR) spectroscopy, X-ray diffraction, electron microscopy, magnetometry, and Mössbauer spectroscopy were used to characterize the samples. X-ray diffraction (XRD) patterns confirmed the formation of the spinel Fe3O4 crystal structure. FT-IR spectra confirmed the presence of organic molecules at the surface of the particles. Electron microscope images showed the mean particle size is in the range of 20–80 nm. Based on these images, we found that tuning the growth conditions has a strong effect on particle size and morphology. High resolution transmission electron microscope images showed the aggregation of very fine crystallite with different orientations. The lattice striations confirmed the well-crystallized nature of the nanoparticles. Room-temperature magnetization loops showed all samples are magnetically soft, with very little hysteresis, and that the specific magnetization, ranging from 14–65 Am2 kg−1, is highly dependent on particle size and experimental conditions. Room-temperature Mössbauer spectra are typical of nonstoichiometric Fe3−δO4, with a small excess of Fe3+, 0.07≤δ≤0.18. Our results showed that it is possible to improve the crystal structure of the particles by tuning the growth parameters.