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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.
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|
|Publisher Link: ||http://dx.doi.org/10.1021/acs.langmuir.5b00285|
|Appears in Collections:||Published Articles (Materials)|
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