Article Dans Une Revue Instrumentation & Methods Année : 2008

3D-Geometrical and chemical quantification of Au@SiOx nano-composites in HAADF-STEM imaging mode

Résumé

Hybrid gold and Silica nano-composites (Au@SiOx) can be used for photonic, optical and biomedical applications, for example for the development of novel contrast agents in magnetic resonance imaging (e.g. [1]). According to the synthesis conditions, these nano-hybrids can adopt various configurations, such as core-shell structures, distribution of Au nano-particles exclusively inside, or at the surface of the silica-based particles. The synthesis involves micro-emulsions; the native micellar structure (oil in water, presence of surfactant, co-surfactant) defines the final silica morphology, and the localization of gold particles with respect to the silica ones depends on the order of adding nano-reactors. An optimised feedback on the synthesis conditions requires a detailed geometrical and chemical analysis of the final products. According to the nanometric size of these objects (see figure 1), a stereoscopy approach in HAADF (High Angle Annular Dark Field) imaging in a Transmission Electron Microscope appears to be an elegant way for that purpose.

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Dates et versions

hal-00434018 , version 1 (20-11-2009)

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Samir Benlekbir, Thierry Epicier, Matteo Martini, Pascal Perriat. 3D-Geometrical and chemical quantification of Au@SiOx nano-composites in HAADF-STEM imaging mode. Instrumentation & Methods, 2008, pp.299-300. ⟨10.1007/978-3-540-85156-1_150⟩. ⟨hal-00434018⟩
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