Optical properties of Pd-Ag and Pt-Ag nanoboxes synthesized via galvanic replacement reactions

Silver nanocubes dispersed in water were transformed into Pd-Ag or Pt-Ag nanoboxes by adding either Na 2PdCl 4 or Na 2PtCl 4. By controlling the amount of noble metal salt added, and therefore the molar ratio of Na 2PdCl 4 or Na 2PtCl 4 to Ag, we could tune the surface plasmon resonance peak of the nanostructures across the entire visible spectrum, from 440 to 730 nm. Replacement of Ag with Pd resulted in the formation of a nanobox composed of a Pd-Ag alloy single crystal, but the nanobox formed after replacement of Ag with Pt was instead composed of distinct Pt nanoparticles. DDA calculations suggest that both nanoboxes absorb light strongly, with Q abs/Q sca ≈ 5. After galvanic replacement, Pd-Ag and Pt-Ag nanostructures remain SERS active, suggesting their use as a SERS probe for studying the dependence of interfacial chemistry on composition. © 2005 American Chemical Society.

Full Text

Duke Authors

Cited Authors

  • Chen, J; Wiley, B; McLellan, J; Xiong, Y; Li, ZY; Xia, Y

Published Date

  • 2005

Published In

Volume / Issue

  • 5 / 10

Start / End Page

  • 2058 - 2062

International Standard Serial Number (ISSN)

  • 1530-6984

Digital Object Identifier (DOI)

  • 10.1021/nl051652u