Growth and Overgrowth of Concentrated Gold Nanorods: Time Resolved SAXS and XANES

The growth of gold nanorods has been followed by small angle X-ray scattering and X-ray absorption. The synthesis is performed at high concentration of 3.5 mM in gold using in situ generation of seeds. It is shown that the growth occurs at constant number density of nanoparticles after the initial n...

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Bibliographic Details
Published in:Crystal growth & design 2012-03, Vol.12 (3), p.1548-1555
Main Authors: Hubert, F, Testard, F, Thill, A, Kong, Q, Tache, O, Spalla, O
Format: Article
Language:English
Subjects:
Chemical synthesis methods
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Materials science
Methods of nanofabrication
Nanoscale materials and structures: fabrication and characterization
Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals
Physics
Quantum wires
Structure of solids and liquids
crystallography
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Summary:The growth of gold nanorods has been followed by small angle X-ray scattering and X-ray absorption. The synthesis is performed at high concentration of 3.5 mM in gold using in situ generation of seeds. It is shown that the growth occurs at constant number density of nanoparticles after the initial nucleation of seeds and that the final step of reduction of Au­(I) to Au(0) occurs only at the surface of the growing nanorods. Anisotropy is acquired during the growth with a ratio of longitudinal to basal growth rates measured at 12. The final aspect ratio is only limited by the available amount of material and the experiment of overgrowth was allowed to reach a final aspect ratio of 5 instead of the initial 3.6.
ISSN:1528-7483
1528-7505
DOI:10.1021/cg2016116