Undulated Gold Nanoplatelet Superstructures
- 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.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.…
Author details: | Ferenc LiebigGND, Radwan Mohamed SarhanORCiDGND, Claudia Christina PrietzelGND, Andreas F. ThünemannORCiD, Matias BargheerORCiDGND, Joachim KoetzORCiDGND |
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DOI: | https://doi.org/10.1021/acs.langmuir.7b02898 |
ISSN: | 0743-7463 |
Pubmed ID: | https://pubmed.ncbi.nlm.nih.gov/29617144 |
Title of parent work (English): | Langmuir |
Subtitle (English): | In Situ Growth of Hemispherical Gold Nanoparticles onto the Surface of Gold Nanotriangles |
Publisher: | American Chemical Society |
Place of publishing: | Washington |
Publication type: | Article |
Language: | English |
Date of first publication: | 2018/03/27 |
Publication year: | 2018 |
Release date: | 2021/12/08 |
Volume: | 34 |
Issue: | 15 |
Number of pages: | 11 |
First page: | 4584 |
Last Page: | 4594 |
Funding institution: | German Research FoundationGerman Research Foundation (DFG) [KO 1387/14-1, INST 336/64-1] |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie |
Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie | |
DDC classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften | |
Peer review: | Referiert |