Functionalization of nano-structured carbons for the preparation of supported heterometallic cluster-derived nanoparticles
(2012)
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- Abstract
- (en) The incorporation of bimetallic nanoparticles onto carbon materials in a controlled way at the nanoscale remains nowadays an important challenge. The present work addresses this question by using two approaches. First, heterometallic molecular clusters as multi-metallic entities with a well-defined stoichiometry were selected as metallic precursors. Second, in order to control the microstructure of the final materials, it is necessary to optimize the precursor-support interactions by surface functionalization. The two main objectives of this thesis are therefore: (1) to explore the potential of nano-structured carbons (nanotubes, nanofibers and mesoporous carbon) as supports for clusters and to investigate the influence of their functionalization, (2) to determine whether molecular clusters are appropriate precursors of bimetallic particles and allow an appropriate control of the final nanoparticles structure. The first part of this study consisted in developing a method to functionalize the carbon materials, in order to obtain anchoring sites for molecular clusters. Two different types of anchoring sites were successfully built: neutral chelating phosphine groups and charged ammonium groups. In the second part, clusters containing iron and cobalt or ruthenium associated with platinum and/or gold were incorporated on pristine and functionalized supports. The type of surface function and nature of incorporation solvent were found to influence the yield of incorporation. The obtention of well-dispersed supported nanoparticles after thermal treatment demonstrated the interest of using functionalized supports and molecular clusters as precursors. Moreover, in the case of Ru-Pt, the bimetallic nature of final nanoparticles was proven.
- Affiliations
UCLouvain SST/IMCN/MOST - Molecules, Solids and Reactivity
Citations
Vidick, D. (2012). Functionalization of nano-structured carbons for the preparation of supported heterometallic cluster-derived nanoparticles. https://hdl.handle.net/2078.5/80328