A general nonaqueous route to binary metal oxide nanocrystals involving a C-C bo

2019-09-09 05:44:03

Metal nm Iron chemical oxide

责任者: Pinna, Nicola;Garnweitner, Georg;Antonietti, Markus;Niederberger, Markus 单位: Max Planck Inst. Colloids Interfaces, Research Campus Golm, 14424 Potsdam, Germany 来源出处: Journal of the American Chemical Society,2005,127(15):5608-5612 摘要: A widely applicable solvothermal route to nanocrystalline iron, indium, gallium, and zinc oxide based on the reaction between the corresponding metal acetylacetonate as metal oxide precursor and benzylamine as solvent and reactant is presented. Detailed XRD, TEM, and Raman studies prove that, with the exception of the iron oxide system, where a mixture of the two phases magnetite and maghemite is formed, only phase pure materials are obtained, γ-Ga 2O3, zincite ZnO, and cubic In2O3. The particle sizes lie in the range of 15-20 nm for the iron, 10-15 nm for the indium, 2.5-3.5 nm for gallium, and around 20 nm for zinc oxide. GC-MS analysis of the final reaction solution after removal of the nanoparticles showed that the composition is rather complex consisting of more than eight different organic compounds. Based on the fact that N-isopropylidenebenzylamine, 4-benzylamino-3-penten-2-one, and N-benzylacetamide were the main species found, we propose a detailed formation mechanism encompassing solvolysis of the acetylacetonate ligand, involving C-C bond cleavage, as well as ketimine and aldol-like condensation steps. © 2005 American Chemical Society. 关键词: Nanostructured materials;Iron;Chemical bonds;Zinc oxide;Particle size analysis;X ray diffraction analysis;Transmission electron microscopy;Binary metal oxide nanocrystals;Metal oxide precursors;Benzylamine;N-benzylacetamide