Hematite spindles with optical functionalities: growth of gold nanoshells and assembly of gold nanorods

J Colloid Interface Sci. 2007 Jun 1;310(1):297-301. doi: 10.1016/j.jcis.2007.01.061. Epub 2007 Jan 31.

Abstract

The layer-by-layer (LBL) assembly method, combined with the seeded growth technique, have been used to deposit gold shells on the surface of hematite (alpha-Fe(2)O(3)) spindles. While the LBL method yields dense coatings of preformed Au nanoparticles, when AuCl(-)(4) ions are further reduced by a mild reducing agent, thicker, rough nanostructured shells can be grown. The deposition process was monitored by TEM and UV-visible spectroscopy, demonstrating a gradual change in the optical features of the colloids as the surface is more densely covered. The particles so-prepared can find useful applications in cancer therapy and as SERS substrates. Additionally, we show that Au nanorods can be assembled on hematite spindles, providing a flexible way to tune the optical properties of the resulting composite colloids.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Ferric Compounds / chemistry*
  • Gold / chemistry*
  • Metal Nanoparticles / chemistry*
  • Microscopy, Electron, Scanning Transmission
  • Spectrophotometry, Ultraviolet

Substances

  • Ferric Compounds
  • ferric oxide
  • Gold