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International Journal of Photoenergy
Volume 2006 (2006), Article ID 35126, 7 pages

The influence of KrF excimer laser irradiation on the surface of collagen and collagen/PVP films

1Faculty of Chemistry, Nicolaus Copernicus University, Gagarin 7, Toruń 87-100, Poland
2Laboratoire de Physicochimie Moléculaire (LPCM), UMR 5803 du CNRS, Université de Bordeaux 1, 351 Cours de la Libération, Talence 33405, France

Received 19 February 2006; Revised 16 June 2006; Accepted 18 June 2006

Copyright © 2006 M. Wisniewski et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The surface properties of collagen and collagen/poly(vinyl pyrrolidone) (PVP) films after KrF excimer laser irradiation (λ=248nm) were investigated by means of the technique of scanning electron microscopy (SEM) and optical microscopy (OM). The laser irradiation of the used specimens caused an expansion of materials above their surface with pronounced sings of its melting. The height of the ablated volume in a case of collagen film at a fluence of 1.1J/cm2 was approximately 5μm. A white damage appears on the treated surfaces at a threshold of 0.5J/cm2 with a single pulse and becomes more visible for a higher fluence. It is also noteworthy that along with increasing fluences (beginning from the fluence of 1.7J/cm2), the characteristic filaments at the spot edges are observed. The local heat and pressure generated by the laser radiation were able to induce bubble formation on the surface. Further bubble colliding and bursting produce a three-dimensional polymer “microfoam” structure with interconnected pores. These results can be of interest for some new applications.