**Nanostructuring of Material Surfaces by Laser Ablation**

Cinthya Toro Salazar, María Laura Azcárate and Carlos Alberto Rinaldi

Additional information is available at the end of the chapter

http://dx.doi.org/10.5772/62638

#### **Abstract**

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430 Radiation Effects in Materials

Irradiation of materials such as iron and silicon with single nanosecond laser pulses produces nanostructures on its surfaces. Nevertheless, the deposition before irradiation of thin films on the surface of the silicon wafers can modify the shapes of these struc‐ tures. Upon laser irradiation, different effects are produced on the surfaces of monocrys‐ talline silicon wafers coated with a thin film of Si3N4 than on that of bare ones. After irradiation with a Nd:YAG laser pulse of 532 nm, the coated silicon surface presents a nanostructure that, due to its hydrophobic behavior, can be used for biological applica‐ tions such as cell growth. On the other hand, the nanostructures formed on the surface of metals, such as iron, make them more resistant to oxidation processes by changing their oxidation potentials.

**Keywords:** nanosecond laser ablation, nanoparticles, surface roughness, nanostruc‐ tures, laser micromachining
