Spectroscopic characterization of the surface of iron oxide nanocrystals

2019-09-29 21:35:17

acid surface nanocrystals oxide oleic

责任者: Willis, Amanda L.;Turro, Nicholas J.;OBrien, Stephen 单位: Department of Applied Physics and Applied Mathematics, Columbia University, New York, NY 10027, United States 来源出处: Chemistry of Materials,2005,17(24):5970-5975 摘要: The surface of highly monodisperse magnetic iron oxide (γ-Fe 2O3) nanocrystals was thoroughly investigated by FTIR, NMR, and mass spectroscopy. The nanocrystals were prepared by a thermal decomposition method now widely used for the preparation of magnetic metal and metal oxide nanocrystals. This method takes advantage of oleic acid as a means to passivate the surface and render the particles stable with respect to aggregation or grain growth and keeps them highly dispersed in a variety of organic media. The nature of this surface in terms of ligand structure and the role of oleic acid during the synthesis remained somewhat undetermined until this report. We provide spectroscopic evidence of an oleic acid ligand structural change during γ-Fe2O3 nanocrystal synthesis. © 2005 American Chemical Society. 关键词: Nanostructured materials;Iron oxides;Pyrolysis;Grain growth;Molecular structure;Oleic acid;Fourier transform infrared spectroscopy;Spectroscopic analysis;Ligands;Metal oxide