Journal
NEW JOURNAL OF CHEMISTRY
Volume 35, Issue 10, Pages 2054-2060Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1nj20083f
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Funding
- National Science Foundation [0847957]
- Robert A. Welch Foundation [F-0032]
- State of Texas Norman Hackerman Advanced Research Program [003658-0015-2007]
- The National Science Foundation [0618242]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0618242, 0847957] Funding Source: National Science Foundation
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In this report we present the synthesis and characterization of Pt and Pd dendrimer-encapsulated nanoparticles (DENs) using the method of galvanic exchange. Sixth-generation hydroxylterminated poly(amidoamine) dendrimers were used to prepare Cu DENs composed of 55 atoms. In the presence of either PtCl(4)(2-) or PdCl(4)(2-), the less noble Cu DENs oxidize to Cu(2+) leaving behind an equal-sized DEN of Pt or Pd, respectively. DENs prepared by direct reduction with BH(4)(-), which is the common synthetic route, and those prepared by galvanic exchange have the same composition, structure, and properties as judged by UV-vis spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and electrochemical methods. However, the galvanic exchange synthesis is much faster (3 h vs. 96 h), and the yield of reduced DENs is significantly higher (nearly 100% in the case of galvanic exchange).
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