Berlin 2012 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Nanostructures at surfaces I
O 42.4: Talk
Wednesday, March 28, 2012, 11:15–11:30, MA 042
Directed placement of gold nanorods using removable assembly guiding structures — •Felix Holzner1,2, Cyrill Kuemin1,2, Philip Paul1,2, James L. Hedrick3, Heiko Wolf1, Nicholas D. Spencer2, Urs Duerig1, and Armin Knoll1 — 1IBM Research, Rueschlikon, Switzerland — 2Laboratory of Surface Science and Technology, ETH Zurich, Switzerland — 3IBM Research, Almaden, USA
We present a new assembly and transfer process, where we have used a temperature- sensitive, nanopatterned polymer film as a removable template to position and align gold nanorods onto an underlying target substrate with 10 nm precision [1]. Shape-matching guiding structures have been written by thermal scanning probe lithography with polyphthalaldehyde (PPA) as resist material. The patterns were written using a heated tip to decompose and evaporate the PPA locally pixel by pixel. This can be done with high speed (500000 pixels per second, 20 mm/s scan speed), high accuracy (<10 nm) and excellent control of the patterning depth [2],[3]. Capillary Assembly was used to trap gold nanorods of size 80 nm x 25 nm in the PPA shape-matching guiding structures. Measured standard deviations from the targeted orientation and position were 25.2° and 10.3 nm, respectively. Heating the sample to 215°C leads to a complete evaporation of the PPA and a transfer of the nanorods onto the underlying substrate without affecting the integrity and the placement accuracy of the nanorods.
[1] Holzner et al., Nano Letters, 2011, 11, 3957-3962 [2] Paul et al., Nanotechnology, 2011, 22, 275-306 [3] Knoll et al., Advanced Materials, 2010, 22, 3361-3365