Hematite spindles with optical functionalities: growth of gold nanoshells and assembly of gold nanorods.
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.
Spuch-Calvar
Miguel
M
Departamento de Química Física, and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain.
Pérez-Juste
Jorge
J
Liz-Marzán
Luis M
LM
D005290:Ferric Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry*; D017348:Microscopy, Electron, Scanning Transmission; D013056:Spectrophotometry, Ultraviolet
D005290:Ferric Compounds; C000499:ferric oxide; D006046:Gold