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Results 81-84 of 84.
   Overgrowth of wrinkled InGaAs membranes using molecular beam epitaxy; Martin Lanzoni, Evandro  ; et alin Journal of Crystal Growth (2015), 425 Partly released InGaAs layers forming a wrinkled network are used as templates for InAs growth. A systematic growth study was carried out, where InAs amounts from 0 ML to 3 ML were deposited on the ... [more ▼] Partly released InGaAs layers forming a wrinkled network are used as templates for InAs growth. A systematic growth study was carried out, where InAs amounts from 0 ML to 3 ML were deposited on the patterned samples. The material migration during growth is evaluated by distinct microscopy techniques. We find a systematic accumulation of the deposited material on the released, wrinkled areas of the sample, whereas no material accumulation or formation of three-dimensional nanostructures is observed on the unreleased areas of the sample. [less ▲] Detailed reference viewed: 4 (0 UL)Scratch testing for micro- and nanoscale evaluation of tribocharging in DLC films containing silver nanoparticles using AFM and KPFM techniques; Lucas, Francis ; et alin Surface and Coatings Technology (2014), 260 Scratch testing is a fast and effective method for the measurement of critical loads in order to determine the adhesion properties of coatings and their behavior in tribological applications. Kelvin probe ... [more ▼] Scratch testing is a fast and effective method for the measurement of critical loads in order to determine the adhesion properties of coatings and their behavior in tribological applications. Kelvin probe force microscopy (KPFM) provides a means of monitoring electrostatic charging on the surfaces of materials. In this paper, we describe the use of a combination of scratch testing and KPFM analysis to evaluate the electrostatic effect induced by silver nanoparticles incorporated as clusters in diamond-like carbon (DLC) films, as well as its correlation with the rubbing process. KPFM was used for mapping of the potentials on the surfaces of DLC–Ag films subjected to nanoscale scratching. The procedure was also conducted at the microscale in order to analyze the way in which silver nanoparticles were spread in the track. After scratching, the track was analyzed using backscattered electrons (BSE) and energy dispersive X-ray diffraction (EDX). The BSE images highlighted bright domains of metallic nanoparticles dispersed in the amorphous coating and EDX confirmed the presence of silver nanoparticles in the scratched track. Micro Raman spectroscopy was used to check the DLC signature. The electric potentials of DLC films with and without silver nanoparticles were also analyzed. The results indicated that the incorporation of silver nanoparticles in amorphous materials could offer new option for electrostatic energy storage on the surfaces of materials. [less ▲] Detailed reference viewed: 5 (0 UL)InAs migration on released, wrinkled InGaAs membranes used as virtual substrate; Martin Lanzoni, Evandro ; et alin Nanotechnology (2014), 25(45), 455603 Partly released, relaxed and wrinkled InGaAs membranes are used as virtual substrates for overgrowth with InAs. Such samples exhibit different lattice parameters for the unreleased epitaxial parts, the ... [more ▼] Partly released, relaxed and wrinkled InGaAs membranes are used as virtual substrates for overgrowth with InAs. Such samples exhibit different lattice parameters for the unreleased epitaxial parts, the released flat, back-bond areas and the released wrinkled areas. A large InAs migration towards the released membrane is observed with a material accumulation on top of the freestanding wrinkles during overgrowth. A semi-quantitative analysis of the misfit strain shows that the material migrates to the areas of the sample with the lowest misfit strain, which we consider as the areas of the lowest chemical potential of the surface. Material migration is also observed for the edge-supported, freestanding InGaAs membranes found on these samples. Our results show that the released, wrinkled nanomembranes offer a growth template for InAs deposition that fundamentally changes the migration behavior of the deposited material on the growth surface. [less ▲] Detailed reference viewed: 5 (0 UL) Die Jugend in der Südregion LuxemburgsHeinen, Andreas Article for general public (2007) Detailed reference viewed: 7 (1 UL) |
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