Search

In the present work, Ni0.6Cd0.4DyxFe2-xO4 (x = 0.0, 0.05, 0.10, 0.15, 0.20) nanoparticles (NPs) were synthesized by using sol–gel method. X-ray diffraction (XRD) patterns confirmed that the pure and dysprosium substituted Ni–Cd ferrites are in single-phase spinel structures, while a trace of DyFeO3 appears as a minor phase for higher concentrations (x = 0.10, 0.15 and 0.20). The Debye–Scherrer's method and Williamson–Hall (W-H) method were used to evaluate the crystallite sizes and lattice strain. Scanning electron microscope (SEM) images show that reduction of grain size with Dy3+ content. Elemental composition features of samples were examined by Energy-dispersive X-ray spectroscopy (EDS). The average particles size estimated from transmission electron microscopy (TEM) analysis is in good agreement with results obtained from XRD. The results showed that saturation magnetization (Ms) decreases and coercivity (Hc) increases with an increase in Dy3+ concentrations. The dielectric constant was found to decrease with increasing Dy content in Ni–Cd ferrites. [ABSTRACT FROM AUTHOR]

Hydrophobic Fe/Pt@Au core-shell nanoparticles (NPs) were synthesized in a quaternary CTAB/n-butanol/n-heptane/water reverse micelle. Dodecylthiol coated around the NPs as functional agent could be help the NPs to form a self-assembled monolayer of which can be viewed clearly by transmission electron microscopy (TEM). A scanning tunneling microscope (STM) was used to find the subtle self-assembled monolayer of the NPs and to measure their current-voltage characteristics as a function of the separation between the probe tip and the self-assembled monolayer of hydrophobic Fe/Pt@Au core-shell NPs on graphite. At room temperature, when the tip was positioned over the monolayer NPs on graphite, the current-voltage data showed 'Coulomb staircase' behavior. [ABSTRACT FROM AUTHOR]