doi:10.3390/nano12142380engPorta-Velilla, LuisTuran, NeslihanCubero, AlvaroShao, WeiLi, HongtaoFuente, German F. de laMartinez, ElenaLarrea, AngelCastro, MiguelKoralay, HalukCavdar, SukruBonse, JoernAngurel, Luis A.Highly regular hexagonally-arranged nanostructures on Ni-W alloy tapes upon irradiation with ultrashort UV laser pulsesART-2022-130354Nickel tungsten alloy tapes (Ni-5 at% W, 10 mm wide, 80 mu m thick, biaxially textured) used in second-generation high temperature superconductor (2G-HTS) technology were laser-processed in air with ultraviolet ps-laser pulses (355 nm wavelength, 300 ps pulse duration, 250-800 kHz pulse repetition frequency). By employing optimized surface scan-processing strategies, various laser-generated periodic surface structures were generated on the tapes. Particularly, distinct surface microstructures and nanostructures were formed. These included sub-wavelength-sized highly-regular hexagonally-arranged nano-protrusions, wavelength-sized line-grating-like laser-induced periodic surface structures (LIPSS, ripples), and larger irregular pyramidal microstructures. The induced surface morphology was characterized in depth by electron-based techniques, including scanning electron microscopy (SEM), electron back scatter diffraction (EBSD), cross-sectional transmission electron microscopy (STEM/TEM) and energy dispersive X-ray spectrometry (EDS). The in-depth EBSD crystallographic analyses indicated a significant impact of the material initial grain orientation on the type of surface nanostructure and microstructure formed upon laser irradiation. Special emphasis was laid on high-resolution material analysis of the hexagonally-arranged nano-protrusions. Their formation mechanism is discussed on the basis of the interplay between electromagnetic scattering effects followed by hydrodynamic matter re-organization after the laser exposure. The temperature stability of the hexagonally-arranged nano-protrusion was explored in post-irradiation thermal annealing experiments, in order to qualify their suitability in 2G-HTS fabrication technology with initial steps deposition temperatures in the range of 773-873 K.2022http://zaguan.unizar.es/record/11960810.3390/nano12142380http://zaguan.unizar.es/record/119608oai:zaguan.unizar.es:119608info:eu-repo/grantAgreement/ES/DGA/T54-20Rinfo:eu-repo/grantAgreement/EC/H2020/951730/EU/Laser-induced hierarchical micro-/nano-structures for controlled cell adhesion at implants/LaserImplantThis project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No H2020 951730-LaserImplantinfo:eu-repo/grantAgreement/ES/MICINN/AEI/PID2020-113034RB-I00Nanomaterials 12, 14 (2022), 2380 [23 pp.]byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess