title: Nickel nanoparticles obtained by a modified polyol process: synthesis, characterization, and magnetic properties.
abstract: The synthesis of nickel nanoparticles using poly(N-vinilpyrrolidone) (PVP) as protective agent was studied. The nanoparticles were prepared in air according to a modified polyol route, using nickel chloride as precursor and sodium borohydride as reducing agent. Samples with different nickel/PVP ratio were obtained. The X-ray diffraction and transmission electron microscopy (TEM) measurements indicate the occurrence of face-centered cubic metallic nickel nanoparticles with a medium diameter of 3.8 nm and good size dispersion. Fourier transformed infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) data show an effective interaction between the nickel nanoparticles surface and the carboxyl oxygen atoms of PVP. Magnetic measurements show single-domain nonideal superparamagnetism behavior due to dipolar magnetic coupling between particles.
authors: Departamento de Química, Universidade Federal do Paraná (UFPR), CP 19081, CEP 81531-990 Curitiba-PR, Brazil.
authors: Giselle G
authors: GG
authors: Couto
authors: João J
authors: JJ
authors: Klein
authors: Wido H
authors: WH
authors: Schreiner
authors: Dante H
authors: DH
authors: Mosca
authors: Adilson J A
authors: AJ
authors: de Oliveira
authors: Aldo J G
authors: AJ
authors: Zarbin