The synthesis, characterization and structure-function
relationships of mono- and bimetallic dendrimerencapsulated
nanoparticles (DENs) are described. Control
over the factors influencing the structure of bimetallic
DENs has been attained for PdAu and AuAg systems. The
bimetallic DENs are characterized by UV-vis, HRTEM, and
single-particle energy dispersive x-ray spectroscopy
(EDS). In addition, we use catalysis and selective
extraction to chemically probe the surface structure. The
fabrication of TiO2-supported Pd, Au and PdAu
nanocomposites from DEN precursors is shown to be a viable
route for the synthesis of catalytically active,
reasonably monodisperse heterogeneous catalysts. Using
the dendrimer-templating synthesis, tight control over the
size of 1- 2 nm Pd DEN catalysts has led to the
observation of a particle-size effect for the
hydrogenation of allyl alcohol. We have proposed that for
particles with diameters between 1.5 1.9 nm the reaction
occurs preferentially on the exposed face atoms.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/3062 |
| Date | 12 April 2006 |
| Creators | Wilson, Orla Mary |
| Contributors | Crooks, Richard M. |
| Publisher | Texas A&M University |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation, text |
| Format | 7046939 bytes, electronic, application/pdf, born digital |
Page generated in 0.0024 seconds