Quantitative Analysis of the Stability of Pd Dendrimer-Encapsulated Nanoparticles
journal contributionposted on 01.09.2009, 00:00 by Emily V. Carino, Marc R. Knecht, Richard M. Crooks
The stability of Pd dendrimer-encapsulated nanoparticles (DENs) in air-, N2-, and H2-saturated aqueous solutions is reported. The DENs consisted of an average of 147 atoms per sixth-generation, poly(amidoamine) dendrimer. Elemental analysis and UV−vis spectroscopy indicate that there is substantial oxidation of the Pd DENs in the air-saturated solution, less oxidation in the N2-saturated solution, and no detectable oxidation when the DENs are in contact with H2. Additionally, the stability improves when the DEN solutions are purified by dialysis to remove Pd2+-complexing ligands such as chloride. For the air- and N2-saturated solutions, most of the oxidized Pd recomplexes to the interiors of the dendrimers, and a lesser percentage escapes into the surrounding solution. The propensity of Pd DENs to oxidize so easily is a likely consequence of their small size and high surface energy.