Self-assembling systems of colloidal spheres are widely used as templates for the structured deposition of metals and semiconductors. Multilayer samples of ordered polystyrene spheres are prepared by a flow induced process. The subsequent surface activation by a dielectric barrier discharge in oxygen is followed by the fabrication of protecting polysiloxane layers. Electrochemical deposition of copper is used to test the stability of the pre-treated colloidal crystal. The arrangement of the spheres is preserved during the deposition process, due to the polysiloxane layer. The results of the consecutive preparation steps are investigated concerning topographical and chemical changes by atomic force microscopy, scanning electron microscopy and X-ray photoelectron spectroscopy.
Articles you may be interested inSilver nano-entities through ultrafast double ablation in aqueous media for surface enhanced Raman scattering and photonics applications Detection of organic vapors by graphene films functionalized with metallic nanoparticles Molecular orientation and electronic structure of 11,11,12,12-tetracyanonaphtho-2,6-quinodimethane vacuumdeposited on metal substrates: Charge transfer, complexation, and potassium doping J. Appl. Phys. 105, 023703 (2009); 10.1063/1.3055812Photoelectron spectroscopy study of metallic nanocluster arrangement at the surface of reactively sputtered amorphous hydrogenated carbon Metastable induced electron spectroscopy, ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and atomic force microscopy are employed to study the adsorption of silver on cinnamyl alcohol films prepared on Au(111) substrates by thermal evaporation. Additionally, the impact of an Ar atmosphere dielectric barrier discharge plasma applied to the cinnamyl alcohol film preliminary to the Ag adsorption is investigated. In both cases silver nano particles with an average diameter of 9 nm are formed. These particles do not interact chemically with the underlying cinnamyl alcohol film. We do not find any influence of the preliminary Ar plasma-treatment on the adsorption behavior at all.
Cyanoacrylates form a highly reactive class of adhesives that provide significant adhesive strength to surfaces within a few seconds. Despite their commercial use, the exact bonding mechanism is virtually unknown. In the present work, we spin coat nanometer-thin films of ethyl cyanoacrylate on two model substrates: gold and silicon dioxide. This allows the interface to be studied directly with X-ray photoelectron spectroscopy (XPS). Thus, investigations are feasible to identify chemical interactions at the boundary between the adhesive and metal (oxide), which are possible reasons for film adhesion on the macroscopic scale. On SiO 2 , an increase in the binding energy of the OC−O group was observed in thin films, indicating hydrogen bonding with the oxide surface. Metastable induced electron spectroscopy measurements consistently indicate a preferential orientation of the carbonyl group toward the silicon dioxide surface. Furthermore, evidence for an ionic interaction of the adhesive via a carboxylate ion (COO − ) with the SiO 2 substrate was found by XPS. On gold, on the other hand, neither evidence of an ionic interaction nor evidence of hydrogen bonding could be found.
The radical oxidation of Ge(100) applying a dielectric barrier discharge plasma was investigated using metastable induced electron spectroscopy, ultraviolet photoelectron spectroscopy, and x-ray photoelectron spectroscopy. The plasma treatments were performed in a pure oxygen atmosphere as well as under environmental conditions at room temperature. In both atmospheres GeO2 layers up to thicknesses of several nm were formed on the Ge(100) surface.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.