title: Nanopatterned monolayers of an adsorbed chromophore.
abstract: A simple lift-off process was developed to rapidly fabricate nanopatterned photofunctional surfaces. Dye molecules of a perylene derivative (PDID) were adsorbed irreversibly on clean silicon through the holes of an electron-beam lithographied polymer mask. The subsequent removal of the mask in a proper solvent results in PDID nanosized regions of width as small as 30 nm for stripes and of diameter as small as 120 nm for dots. Numerical analyses of atomic force microscopy and laser-scanning confocal microscopy images show that the dye molecules are confined to the regions defined by the lithographic process, with the integrated fluorescence intensity being essentially proportional to the size of the nanofeatures. This demonstrates that a simple organic lift-off process compatible with clean-room technology, and not involving any chemical step, is able to produce photofunctional nanopatterned surfaces, even though the dye is not chemically bonded to the silicon surface.
authors: Unité de Physique et de Chimie des hauts Polymères, Université Catholique de Louvain, Croix du Sud 1, B-1348 Louvain-la-Neuve, Belgium. Unité de Chimie des Matériaux Organiques et Inorganiques, Université Catholique de Louvain, Place Louis Pasteur 1, B-1348 Louvain-la-Neuve, Belgium.
authors: N
authors: N
authors: Frederich
authors: B
authors: B
authors: Nysten
authors: A-S
authors: AS
authors: Duwez
authors: B
authors: B
authors: Muls
authors: J
authors: J
authors: Hofkens
authors: A M
authors: AM
authors: Jonas
authors: J-L
authors: JL
authors: Habib-Jiwan