Optical and morphological properties of nanostructured TiOx film formed by 532nm nanosecond pulsed laser irradiation in water is analysed. We observe three different surface features: blackening, surface pits and sub-surface bubbles. The appearance of these features is allowed once an irradiation fluence of 0.9Jcm-2 is used. Nevertheless, blackening, formation of pits and bubble are delayed until an accumulated fluence threshold of 7.5, 23 and 24Jcm-2 is achieved respectively. A fully evolved complex nano-porous structure is obtained at an accumulated fluence of 100Jcm-2. A possible mechanism of formation of these features was inferred.
Optical and morphological evolution of black TiOx synthesized in water by Nd:YAG laser
ZIMBONE, MASSIMO;CACCIATO, GIUSEPPE;RUFFINO, FRANCESCO;GRIMALDI, Maria Grazia
2017-01-01
Abstract
Optical and morphological properties of nanostructured TiOx film formed by 532nm nanosecond pulsed laser irradiation in water is analysed. We observe three different surface features: blackening, surface pits and sub-surface bubbles. The appearance of these features is allowed once an irradiation fluence of 0.9Jcm-2 is used. Nevertheless, blackening, formation of pits and bubble are delayed until an accumulated fluence threshold of 7.5, 23 and 24Jcm-2 is achieved respectively. A fully evolved complex nano-porous structure is obtained at an accumulated fluence of 100Jcm-2. A possible mechanism of formation of these features was inferred.| File | Dimensione | Formato | |
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