Synthesis and Optical Characterization of Submicrometer Gold Nanotubes Grown on Goethite Rods
| Autor: | Luis M. Liz-Marzán, Jorge Pérez-Juste, Miguel Spuch-Calvar, Jessica Pacifico |
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| Rok vydání: | 2008 |
| Předmět: |
Scanning electron microscope
Chemistry Nanotechnology Surfaces and Interfaces Hematite Condensed Matter Physics Rod Chemical engineering Transmission electron microscopy visual_art Electrochemistry visual_art.visual_art_medium Surface roughness Surface modification General Materials Science Nanometre Spectroscopy Plasmon |
| Zdroj: | Langmuir. 24:9675-9681 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/la8001306 |
| Popis: | Goethite (FeOOH) rods were used as templates for growing gold nanotubes with a length of a few hundred nanometers and an aspect ratio between 3 and 4. Successful uniform growth required surface modification, followed by the attachment of small Au seeds and one-step seeded growth using formaldehyde as a reducing agent, as previously reported for the growth of Au shells on silica spheres and hematite spindles. The thickness and surface roughness of the obtained shells could be adjusted by simply varying the concentration ratio between seeds (modified goethite rods) and growth reagents (HAuCl 4 and formaldehyde). The morphology of the synthesized gold nanotubes was thoroughly characterized by TEM, SEM, and AFM/MFM. The resulting gold nanotubes display well-defined plasmon resonances, with a strong longitudinal mode centered around ca. 1400 nm and a broad band in the visible resulting from the overlap of a transverse mode and a multipolar mode, as was found from theoretical modeling using the boundary element method, which provides reasonable agreement with the experimental results. |
| Databáze: | OpenAIRE |
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