Κατασκευή βιομιμητικών ιεραρχικών δομών πυριτίου με χρήση λέιζερ με ερφαρμογές στην αναγεννητική ιστών

This dissertation deals with ultrafast laser micro / nano-structuring of crystalline silicon. Irradiation of crystalline Si with intense ultrafast laser light in the presence of a reactive gas (sulfur hexafluoride, SF6) or in water environment leads to a change in its surface morphology. Upon laser irradiation, silicon surface is covered with a quasi-ordered array of micrometer-sized structures (Si spikes), when processing occurs in SF6, or with high density regular arrays of nanometer-scale structures (Si ripples, Si rods) when processing occurs in water. The microstructured Si surface has near-unity absorptance from the near-ultraviolet to the near-infrared and acquires increased hydrophobicity. Finally, we report on the potential biological applications that laser-structured Si may have. We investigate the fibroblast cell adhesion and viability on the laser-textured Si surfaces as well as the covalent attachment of amyloid peptides on them