Adsorption of silver thiourea complexes on gold nanorod surfaces
The adsorption of silver complexes on gold nanoparticles seems to play a crucial role in gold nanorod (AuNRs) formation. We were able to detect the adsorption indirectly using the combination of SAXS, SANS and TEM. The AuNRs are stabilized with a bilayer of CTAB. The replacement of CTAB by silver thiourea complexes leads to a transformation of the CTAB molecule arrangement to micelles that can be detected easily by SANS. The change of the electron density of the stabilizing layer on top of the AuNRs is accessible via simultaneous SAS fitting. There we observed an unexpected behavior where the amount of transformed micelles and the electron density of the AuNR shell decreases as the silver ion concentration in solution was increased. We are convinced that we will understand this effect using titration-like experiments where each step will be characterized by SAXS and SANS, respectively. Analyzing this data will help us to evaluate the amount of CTAB and silver complexes per AuNR surface. This will lead to a deep understanding of the stabilizing effect of CTAB on noble metal nanoparticles in general and the catalytic behavior of silver complexes in the case of AuNR synthesis.
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SCHMUTZLER Tilo; HEPPT Jano; LINDNER Peter; SCHINDLER Torben and UNRUH Tobias. (2016). Adsorption of silver thiourea complexes on gold nanorod surfaces. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-12-467
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