title: Guided assembly of gold colloidal nanoparticles on silicon substrates prepatterned by charged particle beams.
abstract: Colloidal gold nanoparticles represent technological building blocks which are easy to fabricate while keeping full control of their shape and dimensions. Here, we report on a simple two-step maskless process to assemble gold nanoparticles from a water colloidal solution at specific sites of a silicon surface. First, the silicon substrate covered by native oxide is exposed to a charged particle beam (ions or electrons) and then immersed in a HF-modified solution of colloidal nanoparticles. The irradiation of the native oxide layer by a low-fluence charged particle beam causes changes in the type of surface-terminating groups, while the large fluences induce even more profound modification of surface composition. Hence, by a proper selection of the initial substrate termination, solution pH, and beam fluence, either positive or negative deposition of the colloidal nanoparticles can be achieved.
authors.affiliation: Institute of Physical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic. kolibal.m@fme.vutbr.cz
authors.forename: Miroslav
authors.initials: M
authors.lastname: Kolíbal
authors.forename: Martin
authors.initials: M
authors.lastname: Konečný
authors.forename: Filip
authors.initials: F
authors.lastname: Ligmajer
authors.forename: David
authors.initials: D
authors.lastname: Škoda
authors.forename: Tomáš
authors.initials: T
authors.lastname: Vystavěl
authors.forename: Jakub
authors.initials: J
authors.lastname: Zlámal
authors.forename: Peter
authors.initials: P
authors.lastname: Varga
authors.forename: Tomáš
authors.initials: T
authors.lastname: Šikola
mesh_terms: D003102:Colloids / Q000737:chemistry* / Q000528:radiation effects; D003460:Crystallization / Q000379:methods*; D006046:Gold / Q000737:chemistry* / Q000528:radiation effects; D020450:Heavy Ions; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000528:radiation effects; D010315:Particle Accelerators; D010316:Particle Size; D012825:Silicon / Q000737:chemistry* / Q000528:radiation effects; D013499:Surface Properties / Q000528:radiation effects
chemical_list: D003102:Colloids; D006046:Gold; D012825:Silicon