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Title: In situ monitoring of laser-induced periodic surface structures formation on polymer films by grazing incidence small-angle X-ray scattering
Authors: Rebollar, Esther
Rueda, Daniel R.
Martin-Fabiani, Ignacio
Rodriguez-Rodriguez, Alvaro
Garcia-Gutierrez, Mari-Cruz
Portale, Giuseppe
Castillejo, Marta
Ezquerra, Tiberio A.
Issue Date: 2015
Publisher: © American Chemical Society
Citation: REBOLLAR, E. ... et al., 2015. In situ monitoring of laser-induced periodic surface structures formation on polymer films by grazing incidence small-angle X-ray scattering. Langmuir, 31 (13), pp. 3973 - 3981.
Abstract: The formation of laser-induced periodic surface structures (LIPSS) on model spin-coated polymer films has been followed in situ by grazing incidence small-angle X-ray scattering (GISAXS) using synchrotron radiation. The samples were irradiated at different repetition rates ranging from 1 up to 10 Hz by using the fourth harmonic of a Nd:YAG laser (266 nm) with pulses of 8 ns. Simultaneously, GISAXS patterns were acquired during laser irradiation. The variation of both the GISAXS signal with the number of pulses and the LIPSS period with laser irradiation time is revealing key kinetic aspects of the nanostructure formation process. By considering LIPSS as one-dimensional paracrystalline lattice and using a correlation found between the paracrystalline disorder parameter, g, and the number of reflections observed in the GISAXS patterns, the variation of the structural order of LIPSS can be assessed. The role of the laser repetition rate in the nanostructure formation has been clarified. For high pulse repetition rates (i.e., 10 Hz), LIPSS evolve in time to reach the expected period matching the wavelength of the irradiating laser. For lower pulse repetition rates LIPSS formation is less effective, and the period of the ripples never reaches the wavelength value. Results support and provide information on the existence of a feedback mechanism for LIPSS formation in polymer films.
Description: This paper was accepted for publication in the journal Langmuir [© American Chemical Society] and the definitive version is available at: https://doi.org/10.1021/acs.langmuir.5b00285
Sponsor: The authors gratefully acknowledge financial support from the MINECO (MAT2011-23455, MAT2012-33517 and CTQ 2013-43086-P). E.R., I.M.-F., and A.R-R. also thank MINECO for a Ramon y Cajal contract (RYC-2011-08069) and FPI ́ fellowships (BES-2010-030074 and BES-2013-062620). We thank Z. Roslaniec and A. Szymczyk for providing the PTT sample and W. Bras for fruitful discussions.
Version: Accepted for publication
DOI: 10.1021/acs.langmuir.5b00285
URI: https://dspace.lboro.ac.uk/2134/26693
Publisher Link: http://dx.doi.org/10.1021/acs.langmuir.5b00285
ISSN: 0743-7463
Appears in Collections:Published Articles (Materials)

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