Detailseite
Projekt
Synthese von Nanodrähten und Nanoröhren durch kontrollierte Organisation oberflächenfunktionalisierter Metalloxid-Nanopartikel
Antragsteller
Professor Dr. Markus Niederberger
Fachliche Zuordnung
Physik der kondensierten Materie
Förderung
Förderung von 2004 bis 2007
Projektkennung
Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 5428647
In this project, we will focus on two main objectives: 1) Synthesis of crystalline metal oxide nanoparticles with appropriate surface functionality and 2) Assembly of these nanoscale building blocks to nanowires and nanotubes. In a first step, oxidic nanoparticles will be synthesized with good control over particle size, shape and crystallinity. This means that the particles have to be uniform, preferentially spherical in shape, they should have a small particle size distribution and they should exhibit high crystallinity. Furthermore, the surface of the particles will be functionalized with coordinating ligands in order to make possible the controlled fabrication of nanowires and nanotubes using the nanoparticles as nanoscale building blocks. Since the potential applications of nanowires and nanotubes are mainly expected in the fields of electrochemistry, electronics and catalysis, the oxidic nanobuilding blocks have to be chosen accordingly. Especially perovskites (BaTiO3 und Pb(Zr,Ti)O3,...), conducting oxides (ZnO, SnO2, In2O3,...) and oxides that were made conducting by the incorporation of dopants and defects (TiO2, V2O5, ZrO2, Nb2O5, Ta2O5, WO3, MoO3,....) are promising precursor particles. The organization of the nanoparticle building blocks into nanowires and nanotubes will be performed in two different ways, either by self-assembly of nanoparticles with specifically functionalized crystal surfaces, or by coating of solid exo-templates with the nanoparticles. The first method is based on the adsorption of polydentate ligands to the surface of the nanoparticles in a crystallographically selective manner leading to differentially functionalized crystal faces. With this approach, the fabrication of anisotropic nanostructures such as nanowires via self-assembly will be possible. The second method involves the coating of exo-templates, preferentially anisotropic polymer particles, with the inorganic precursor particles resulting in the formation of nanotubes after removal of the template.
DFG-Verfahren
Schwerpunktprogramme
