Format:
1 Online-Ressource (ix, 125 Seiten, 25443 KB)
,
Illustrationen, Diagramme
Content:
Nanolenses are linear chains of differently-sized metal nanoparticles, which can theoretically provide extremely high field enhancements. The complex structure renders their synthesis challenging and has hampered closer analyses so far. Here, the technique of DNA origami was used to self-assemble DNA-coated 10 nm, 20 nm, and 60 nm gold or silver nanoparticles into gold or silver nanolenses. Three different geometrical arrangements of gold nanolenses were assembled, and for each of the three, sets of single gold nanolenses were investigated in detail by atomic force microscopy, scanning electron microscopy, dark-field scattering and Raman spectroscopy. The surface-enhanced Raman scattering (SERS) capabilities of the single nanolenses were assessed by labelling the 10 nm gold nanoparticle selectively with dye molecules. The experimental data was complemented by finite-difference time-domain simulations. For those gold nanolenses which showed the strongest field enhancement, SERS signals from the two different internal gaps were compared by selectively placing probe dyes on the 20 nm or 60 nm gold particles. The highest enhancement was found for the gap between the 20 nm and 10 nm nanoparticle, which is indicative of a cascaded field enhancement. ...
Note:
Dissertation Universität Potsdam 2018
Additional Edition:
Erscheint auch als Druck-Ausgabe Heck, Christian Gold and silver nanolenses self-assembled by DNA origami Potsdam, 2017
Language:
English
Keywords:
DNS-Origami
;
Nanopartikel
;
Rasterelektronenmikroskopie
;
Oberflächenverstärkter Raman-Effekt
;
Hochschulschrift
URN:
urn:nbn:de:kobv:517-opus4-409002
URL:
Volltext
(kostenfrei)
URL:
https://nbn-resolving.org/urn:nbn:de:kobv:517-opus4-409002
URL:
https://d-nb.info/1218403535/34
Author information:
Bald, Ilko 1980-
