Laser-induced crystallization of anodic TiO₂nanotube layers

Abstract

Laser treatment of amorphous TiO2 nanotube layers leads to their crystallization without deformation or formation of the thermal oxide layer.

The Impact of Side-Selective Laser Tailoring of Titania Nanotubes on Changes in Photoelectrocatalytic Activity

“…Moreover, laser annealing makes it possible to perform modifications over a strictly selected area and under optimized conditions. This technique can be regarded as superior to traditional, energy- and time-consuming furnace treatment [ 39 ].…”

“…The process upscaling requires several optimization steps, and the elaborated route can only be performed at the laboratory scale and cannot be carried out on only a specific part of the substrate. In contrast to these limitations, laser technology offers rapid and easily scalable processing based on the interaction between the coherent, intense light of a particular wavelength with the material [ 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 ]. Additionally, the selection of the laser fluence and the environment in which the process is carried out (vacuum, ambient atmosphere, or ever water) can also be included into the group of important parameters affecting the final product [ 39 , 40 ] (see Table 1 ).…”

SHG and SFG processes at a 100 kHz picosecond diode-pumped Yb:YAG thin-disk laser

“…Lowering the beam intensity of the second harmonic on the crystal surface improves the optical quality of the fourth harmonic, however, only to a certain measure. The fourth harmonic has been used for the deep ultra-violet laser induced crystallization of nanotube layers [5].…”

Wireless Anodization of Ti in Closed Bipolar Cells

“…Please note that some minor amount of Ti 3 + can always be found in the TNT layers produced by anodization due some lattice defects. [38,39] Rationally, also different potentials can be applied to the two half-cells. Figure 4 shows SEM images of the TNT layers obtained when potentials of + 80 V and À 40 V were applied with a frequency of 5.5 × 10 À 4 Hz (meaning the potential was changed every 30 min) for 6 h in total.…”