TY  - JOUR
A1  - Liebig, Ferenc
A1  - Sarhan, Radwan Mohamed
A1  - Schmitt, Clemens Nikolaus Zeno
A1  - Thünemann, Andreas F.
A1  - Prietzel, Claudia Christina
A1  - Bargheer, Matias
A1  - Koetz, Joachim
T1  - Gold nanotriangles with crumble topping and their influence on catalysis and surface-enhanced raman spectroscopy
JF  - ChemPlusChem
N2  - By adding hyaluronic acid (HA) to dioctyl sodium sulfosuccinate (AOT)-stabilized gold nanotriangles (AuNTs) with an average thickness of 7.5 +/- 1 nm and an edge length of about 175 +/- 17 nm, the AOT bilayer is replaced by a polymeric HA-layer leading to biocompatible nanoplatelets. The subsequent reduction process of tetrachloroauric acid in the HA-shell surrounding the AuNTs leads to the formation of spherical gold nanoparticles on the platelet surface. With increasing tetrachloroauric acid concentration, the decoration with gold nanoparticles can be tuned. SAXS measurements reveal an increase of the platelet thickness up to around 14.5 nm, twice the initial value of bare AuNTs. HRTEM micrographs show welding phenomena between densely packed particles on the platelet surface, leading to a crumble formation while preserving the original crystal structure. Crumbles crystallized on top of the platelets enhance the Raman signal by a factor of around 20, and intensify the plasmon-driven dimerization of 4-nitrothiophenol (4-NTP) to 4,4 '-dimercaptoazobenzene in a yield of up to 50 %. The resulting crumbled nanotriangles, with a biopolymer shell and the absorption maximum in the second window for in vivo imaging, are promising candidates for biomedical sensing.
KW  - gold nanostructures
KW  - HRTEM
KW  - hyaluronic acid
KW  - monolayer formation
KW  - SERS
Y1  - 2020
U6  - https://doi.org/10.1002/cplu.201900745
SN  - 2192-6506
VL  - 85
IS  - 3
SP  - 519
EP  - 526
PB  - Wiley-VCH
CY  - Weinheim
ER  -