Combinatorial surface nanostructuring in aluminium-niobium system
Sprache des Titels:
Co-deposition at glancing angles is used for deposition of an AleNb thinfilm library with a compositionalresolution of 0.8 at.% mm?1and a total compositional spread of 55 at.%. Atomic self-shadowing leads to na-nostructure formation along the compositional gradient. The morphology of the obtained different nanowires isfundamentally studied together with their crystallinity in the cubic system and is linked to specificAleNbnanostructured alloys. Composition and morphology of the nanowires, naturally emerging as coupled variablesdue to the deposition geometry, are decoupled using the deposition distance. This allows identifying conditionsfor reproducing a single wire for further applications. Electrical properties are mapped across the library byscanning Kelvin probe microscopy and four point resistivity measurements. Nanowires with low work functionare identified at low Nb concentration. Contact angle measurements are performed along the library before andafter anodic oxide formation, and these changes are mapped as a function of composition. The presentedcompositional mappings are relevant for alloys selection in applications where surface tuning or functionali-zation is paramount.