Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.25: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Directional photochemical growth in gold nanoparticle arrays — •Susan Derenko1, Andrew Sarangan2, and Thomas Härtling1 — 1Fraunhofer Institute for Nondestructive Testing, Dresden Branch, Maria-Reiche-Str. 2, 01109 Dresden, Germany — 2Electro-Optics Program, University of Dayton, 300 College Park, Dayton, Ohio, USA
Plasmonic nanoparticle arrays are interesting building blocks for optical sensors. For their integration into devices one may wish to modify their geometry locally within an array to tune the surface plasmon resonance in certain array sections. We present a method to induce local particle growth by exposure of lithographically fabricated Au-nanoparticle arrays to a HAuCl4 solution. Illumination of the system activates the gold ions in solution, whereas the nanoparticles act as seeds and induce particle growth. We monitor the modification via the shift of the plasmon resonance wavelength. For discoidal particles a growth preferentially perpendicular to the array plane is obtained resulting in a blue-shifted resonance. These findings are supported by AFM and SEM measurements and simulations.