Struktur von Cu-Nanoteilchen

Structural characterization of Cu-Nanoparticles Salzemann, Caroline 1,2; Lisiecki, Isabelle 2; Urban, Jochen 1; Schloegl, Robert 1 ; Pileni, Marie-Paule 2 1 Fritz-Haber-Institut der Max-Planck-Gesellschaft Abt AC, Faradayweg 4-6, D-14195 Berlin. 2 Université P. et M. Curie, laboratoire LM2N, BP52, Bât 74 4 place Jussieu, 75005 Paris Fax : …………… E-mail :Salzeman@fhi-berlin.mpg.de Syntheses of Copper nanoparticles have been carried out in reverse micelles [1] which are used as templates to control the size and the shape of nanoparticles [2] . It has been also observed that the reducing agent plays an important role in the control of particle size and in final oxidation state of the surface [3]. The particles have been prepared by using reverse micelles made of a mixture of Sodium and Copper di(2-ethylhexyl) sulfosuccinate. Hydrazine (N2H4) is the reducing agent. By using this procedure Copper metal nanocrystals and the oxide derivature are obtained. This is demonstrated by High Resolution Electron Microscopy. The calculation of the power spectra of the images is used for the symmetry interpretation and the measuring of structural data. Typical structures of pure metallic Copper as cubic structure and multiply twinned particles [4] and also cuprite structure Cu2O for the oxidized particles were observed. [1] Lisiecki I, Pileni MP, J.Am.Chem.Soc. 1993, 115, 3887. [2] Tanori J, Pileni MP, Adv.Mater. 1995, 7, 862. [3] Lisiecki I, Pileni MP, J.Phys.Chem. 1995, 99, 5077. [4] Lisiecki I, Filankembo A, Sack-Kongehl H, Weiss K, Pileni MP, Urban J, Phys.Rev.B61, 2000, 4968