Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 15: Topical session (Symposium MM): Correlative and in-situ Microscopy in Materials Research
MM 15.3: Vortrag
Dienstag, 2. April 2019, 11:15–11:30, H44
Establishing a mechanistic model for the synthesis of noble metal nanoparticles — •Tobias Zech1, Tilo Schmutzler1, Dennis Noll1, Klaus Götz1, Erdmann Spiecker2, and Tobias Unruh1 — 1LKS, Friedrich-Alexander-Universität Erlangen-Nürnberg — 2CENEM, Friedrich-Alexander-Universität Erlangen-Nürnberg
In our research we are stuying in the interaction between gold nanorods (AuNRs) and the stabilizer in form of CTAB, and how the latter influences the morphology of AuNR during the synthesis. AuNRs have the potential to be integral parts in nanoplasmonic devices and in medicine as biomarker and for photothermal therapy. However, lacking reproducibility and low yield make the synthesis expensive. Additionally, CTAB, assumed to strongly adsorb to gold nanoparticles, makes it difficult to functionalize the surface. We use a combination of SANS and SAXS to analyze the behavior of CTAB micelles, gold nanoparticles and their CTAB stabilization layer in-situ. From this we want to develop a mechanistic model, which more accurately describes the anisotropic growth of AuNR. So far, we were able to develop a stabilization model for small gold nanoparticles with CTAB micelles and improve their long-time stability considerably. Furthermore, we could directly correlate the changes of the structure of CTAB micelles to the resulting aspect ratio of AuNRs, when certain additives are present. SAS experiments will play a vital role in developing deeper understanding of the underlying mechanisms of AuNR growth.