Determination of nanoporous structures formation conditions under laser radiation

Conditions of nanoporous structures formation under laser radiation were defined. Exposure to laser radiation with wavelength of 10.6 µm and pulse repetition rate up to 5 kHz was conducted. It was found that the pores formation intensity, as well as their sizes and shape depend on temperature and speed processing conditions, which are determined by the value and power density distribution in the heating area, and their duration and pulse repetition frequency. A lemon yellow-colored oxide film forms on brass surface and becomes whitish-gray with increase of laser treatment duration that is typical for zinc oxide composed of elongated needle-shaped crystals. The obtained metal materials structures with zinc oxide nanofibers on the surface are promising for sensor applications.