Nanosecond pulsed laser irradiation of titanium in acetone: The effects of coating film structures on the hydrogen absorption properties

Pulsed laser irradiation was performed on titanium in acetone and then the hydrogen storage properties were investigated under a hydrogen atmosphere. TiOxCy films were formed by the irradiation of Ti powders with a fluence of 0.36 J cm(-2). The irradiation increased the hydrogen absorption temperatures. Thus, the TiOxCy films showed a specific kind of hydrogen barrier effect. Irradiation with a fluence of 0.36 J cm(-2) was performed to coat the Ti plate. Although the TiOxCy films formed on the surface, the amount of hydrogen absorption increased compared with the non-irradiated plate because of the change in surface chemical bonding states and high porosity of the films due to the irradiation. The phases generated by irradiation were controlled by the laser fluence. With a low fluence of 0.17 J cm(-2), TiO2 films were formed instead of TiOxCy films, and these dense films showed better hydrogen barrier effects than the non-irradiated plate.