In situ monitoring of laser-induced periodic surface structures formation on polymer films by grazing incidence small-angle X-ray scattering

Langmuir : the ACS Journal of Surfaces and Colloids
Esther RebollarTiberio A Ezquerra

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 nev...Continue Reading

References

May 16, 2007·Physical Review Letters·Suresh NarayananJin Wang
Mar 6, 2010·Nature Protocols·Dong QinGeorge M Whitesides
Apr 17, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·J J HernándezA Munari
Jan 12, 2011·ACS Applied Materials & Interfaces·Chi-Chih HoWei-Li Lee
Apr 5, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Esther RebollarMarta Castillejo
Apr 25, 2012·Langmuir : the ACS Journal of Surfaces and Colloids·I Martín-FabianiT A Ezquerra
Jan 31, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·M Al-HusseinP Müller-Buschbaum
May 4, 2013·Nanoscale·Matthias SchwartzkopfStephan V Roth
Jun 4, 2013·Physical Chemistry Chemical Physics : PCCP·Esther RebollarMarta Castillejo

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Citations

Aug 19, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Stephan V Roth

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