Hematite spindles with optical functionalities: growth of gold nanoshells and assembly of gold nanorods |
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Authors: | Spuch-Calvar Miguel Pérez-Juste Jorge Liz-Marzán Luis M |
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Institution: | Departamento de Química Física, and Unidad Asociada CSIC, Universidade de Vigo, 36310 Vigo, Spain. |
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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. |
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