Superparamagnetic Nanoparticles Doped with Copper Cations and Surface-Capped by Polyvinylpyrrolidone for Biomedical Applications

In this paper, we report well-dispersed superparamagnetic magnetite nanoparticles (SPMNs) surface-capped with polyvinylpyrrolidone (PVP) and structure-doped by Cu(II) ions. The SMNPs powder was obtained though galvanostatic two-electrode cathodic electrochemical synthesis. The prepared SPMNs samples were characterized via the structural and magnetical techniques of FE-SEM, EDS, TEM, XRD, FT-IR, and VSM. The magnetic data measured though VSM technique revealed superparamagnetic nature for the PVP-capped Cu-IONs sample, where relative high saturation magnetization, low remanence and negligible coercivity (i.e. Ms=45.01 emu/g, Mr=0.49 emu/g and Ce=7.3 Oe) were obtained for this sample. In the FT-IR data, all adsorption bands related the PVP polymer i.e. carbon-hydrogen, carbon-oxygen and carbon-nitrogen were detected and proved the surface-capped feature of the deposited iron oxide particles. It was also found that the fabricated magnetic powder had pure magnetite crystal structure doped by about 7.5%wt. copper cations and fine particle size of 5nm. Based on these results, the designed electrochemical procedure was introduced as an efficient and low cost synthetic way for fabricating the surface-capped metal cations doped magnetite ultra-fine particles.