Quantitative analysis of the stability of Pd dendrimer-encapsulated nanoparticles

Emily V. Carino, Marc Knecht, Richard M. Crooks

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

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 airsaturated 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 Pd 2+-complexing ligands such as chloride. For the air- and N 2-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.

Original languageEnglish
Pages (from-to)10279-10284
Number of pages6
JournalLangmuir
Volume25
Issue number17
DOIs
StatePublished - Sep 1 2009
Externally publishedYes

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ASJC Scopus subject areas

  • Electrochemistry
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Materials Science(all)
  • Spectroscopy

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