TY  - JOUR
A1  - Liebig, Ferenc
A1  - Sarhan, Radwan Mohamed
A1  - Prietzel, Claudia Christina
A1  - Thünemann, Andreas F.
A1  - Bargheer, Matias
A1  - Koetz, Joachim
T1  - Undulated Gold Nanoplatelet Superstructures
BT  - In Situ Growth of Hemispherical Gold Nanoparticles onto the Surface of Gold Nanotriangles
JF  - Langmuir
N2  - Negatively charged flat gold nanotriangles, formed in a vesicular template phase and separated by an AOT-micelle-based depletion flocculation, were reloaded by adding a cationic polyelectrolyte, that is, a hyperbranched polyethylenimine (PEI). Heating the system to 100 degrees C in the presence of a gold chloride solution, the reduction process leads to the formation of gold nanoparticles inside the polymer shell surrounding the nanoplatelets. The gold nanoparticle formation is investigated by UV-vis spectroscopy, small-angle X-ray scattering, and dynamic light scattering measurements in combination with transmission electron microscopy. Spontaneously formed gold clusters in the hyperbranched PEI shell with an absorption maximum at 350 nm grow on the surface of the nanotriangles as hemispherical particles with diameters of similar to 6 nm. High-resolution micrographs show that the hemispherical gold particles are crystallized onto the {111} facets on the bottom and top of the platelet as well as on the edges without a grain boundary. Undulated gold nanoplatelet superstructures with special properties become available, which show a significantly modified performance in SERS-detected photocatalysis regarding both reactivity and enhancement factor.
Y1  - 2018
U6  - https://doi.org/10.1021/acs.langmuir.7b02898
SN  - 0743-7463
VL  - 34
IS  - 15
SP  - 4584
EP  - 4594
PB  - American Chemical Society
CY  - Washington
ER  -