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Pezzoli A.,Center for NanoEngineered Materials and Surfaces | Dellasega D.,Center for NanoEngineered Materials and Surfaces | Dellasega D.,ENEA | Russo V.,Center for NanoEngineered Materials and Surfaces | And 5 more authors.
Journal of Nuclear Materials | Year: 2015

Abstract In this work we produced tungsten (W) and W oxide (WOx) films by pulsed laser deposition (PLD) with the aim of the addressing modifications of structure and morphology that occur after annealing treatments and high-flux deuterium plasma. Thanks to the high flexibility of PLD we produced nanostructured W containing non-bounded oxygen, different types of WOx and multilayered films. W coatings are dense, non-porous and exhibit a nanocrystalline structure, resembling the coatings used as first wall in tokamaks. The oxide films are nearly stoichiometric amorphous WOx (x = 3) with different morphology from compact to porous. Depending on annealing temperature, nucleation of different crystalline phases (e.g. WO3, W18O49) occurs. Exposure of films to high-flux (∼1024 m-2 s-1) deuterium plasmas in Magnum-PSI at different surface temperatures (Tmax = 580 K) determines material modifications at the nanoscale (e.g. nanometric defects) but no delamination. In addition preliminary deuterium retention results are reported. © 2014 Elsevier B.V. Source


Gondoni P.,Center for NanoEngineered Materials and Surfaces | Russo V.,Center for NanoEngineered Materials and Surfaces | Bottani C.E.,Center for NanoEngineered Materials and Surfaces | Bottani C.E.,Italian Institute of Technology | And 4 more authors.
Materials Research Society Symposium Proceedings | Year: 2013

The synthesis of hierarchically assembled Al-doped ZnO layers by Pulsed Laser Deposition (PLD) at room temperature was investigated. PLD was performed in a background pressure of 100 Pa O2 to deposit clusters in a low energy regime and obtain nano-and mesostructures resulting from a hierarchical assembly of nanoclusters. We here analyzed the effects of varying the gas flow rate on mesoscale morphology, mass density and optical properties. The variation of the target-to-substrate distance was also investigated, identifying its effects on mass density and film morphology. The optimization of optical properties in terms of transparency and light scattering capability is of potential interest for photovoltaic applications. © 2013 Materials Research Society. Source


Gondoni P.,Center for NanoEngineered Materials and Surfaces | Mazzolini P.,Center for NanoEngineered Materials and Surfaces | Mazzolini P.,Italian Institute of Technology | Pillado Perez A.M.,Center for NanoEngineered Materials and Surfaces | And 5 more authors.
Twin Research and Human Genetics | Year: 2014

Graded Al-doped ZnO layers, constituted by a mesoporous forest-like system evolving into a compact transparent conductor, were synthesized by Pulsed Laser Deposition with different morphologies to study the correlation with functional properties. Morphology was monitored by Scanning Electron Microscopy images and by measuring the resulting surface roughness. Its effects on electrical conductivity - especially carrier mobility, which significantly decreases with increasing roughness - allow to discuss the limitations in conduction mechanisms. Significant changes in light scattering capability due to variations in morphology are also investigated and discussed to study the correlation between morphology and functional properties. © Materials Research Society 2014. Source

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