Couto Giselle G, Klein João J, Schreiner Wido H, Mosca Dante H, de Oliveira Adilson J A, Zarbin Aldo J G
Departamento de Química, Universidade Federal do Paraná (UFPR), CP 19081, CEP 81531-990 Curitiba-PR, Brazil.
J Colloid Interface Sci. 2007 Jul 15;311(2):461-8. doi: 10.1016/j.jcis.2007.03.045. Epub 2007 Mar 27.
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.
研究了以聚（N-乙烯基吡咯烷酮）（PVP）为保护剂合成镍纳米颗粒的方法。纳米颗粒是在空气中按照改进的多元醇路线制备的，使用氯化镍作为前驱体，硼氢化钠作为还原剂。获得了不同镍/PVP比例的样品。X射线衍射和透射电子显微镜（TEM）测量表明，出现了面心立方金属镍纳米颗粒，其平均直径为3.8 nm，尺寸分散性良好。傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）数据表明，镍纳米颗粒表面与PVP的羧基氧原子之间存在有效相互作用。磁性测量表明，由于颗粒之间的偶极磁耦合，呈现单畴非理想超顺磁行为。
