Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 56: [DS] Progress in Micro- and Nanopatterning: Techniques and Applications III (Focused Session, jointly with O - Organisers: Graaf, Hartmann)
O 56.2: Vortrag
Mittwoch, 16. März 2011, 15:15–15:30, GER 38
Photothermal Laser Micro- and Nanoprocessing of Mesoporous Gold — •Lina Schade1, Mareike Mathieu1,2, Monika Biener2, Juergen Biener2, and Nils Hartmann1 — 1Fakultät für Chemie, NETZ, CeNIDE, Universität Duisburg-Essen, Universitätsstr. 5, 45141 Essen, Germany — 2LLNL, Livermore, CA 94550, USA
In recent years, mesoporous gold has gained significant attention as a novel material in actuation, sensing and catalysis. The particular properties of this material result from its spongelike open-cell morphology with pore sizes of about 25 nm. Techniques which allow one to engineer mesoporous gold on a micro- and nanoscale, of course, are of high interest in view of fundamental studies and technical applications. Common annealing procedures, for example, provide a means to adjust the pore size in the range of 50 - 600 nm and investigate size dependent properties, such as the enhancement effect in surface enhanced Raman spectroscopy (SERS) [1]. Here we report on a photothermal laser technique for micro- and nanoprocessing of mesoporous gold [2]. A focused beam of a cw-laser with a wavelength of 532 nm and a 1/e spot size of 1.4 microns is used to locally anneal the substrate surface and fine tune the pore structure. This allows one to fabricate porous gradients on micrometer length scales. In addition, thiol-based self-assembled monolayers provide unique opportunities to functionalize these porous structures [2]. Prospects in SERS measurements and other applications are discussed.
[1] S.O Kucheyev, et al., Appl. Phys. Lett. 89 (2006) 053102.
[2] M. Mathieu, N. Hartmann, NJP, in press.