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Preparation of periodic surface structures on doped poly(methyl metacrylate) films by irradiation with KrF excimer laser.

Kalachyova Y, Lyutakov O, Slepicka P, Elashnikov R, Svorcik V - Nanoscale Res Lett (2014)

Bottom Line: The mechanism of surface ordered structure formation is attributed to polymer ablation, which is more pronounced in the place of higher light intensity.The smoothness of the underlying substrate plays a key role in the quality of surface ordered structure.Most regular grating structures were obtained on polymer films deposited on atomically 'flat' Si substrates.

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Affiliation: Department of Solid State Engineering, Institute of Chemical Technology, Prague 166 28, Czech Republic.

ABSTRACT
In this work, we describe laser modification of poly(methyl methacrylate) films doped with Fast Red ITR, followed by dopant exclusion from the bulk polymer. By this procedure, the polymer can be modified under extremely mild conditions. Creation of surface ordered structure was observed already after application of 15 pulses and 12 mJ cm(-2) fluence. Formation of grating begins in the hottest places and tends to form concentric semi-circles around them. The mechanism of surface ordered structure formation is attributed to polymer ablation, which is more pronounced in the place of higher light intensity. The smoothness of the underlying substrate plays a key role in the quality of surface ordered structure. Most regular grating structures were obtained on polymer films deposited on atomically 'flat' Si substrates. After laser patterning, the dopant was removed from the polymer by soaking the film in methanol.

No MeSH data available.


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Scheme of the preparation of surface ordered structures. (A) PMMA-FR deposition, (B) UV laser irradiation, and (C) diffraction of white light on prepared periodical structure (on ripples).
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Figure 2: Scheme of the preparation of surface ordered structures. (A) PMMA-FR deposition, (B) UV laser irradiation, and (C) diffraction of white light on prepared periodical structure (on ripples).

Mentions: After deposition, the PMMA-FR films were irradiated with KrF excimer laser beam (λ = 248 nm) under various angles with respect to film surface normal. This process is schematically depicted in Figure 2. At the surface of the thin polymer film, an interference between incident and reflected laser beam occurs which results in spatial redistribution of laser intensity along the sample surface [11]. As a result, surface ordered structures are formed. Diffraction under irradiation with white light (angle-dependent coloring of patterned area) indicates the quality of the created pattern. The left side of Figure 2 gives the sample photo before and after laser modification. The patterned area is clearly visible on the sample. Homogeneous distribution of diffracted light indicates regular periodicity and amplitude of prepared grating.


Preparation of periodic surface structures on doped poly(methyl metacrylate) films by irradiation with KrF excimer laser.

Kalachyova Y, Lyutakov O, Slepicka P, Elashnikov R, Svorcik V - Nanoscale Res Lett (2014)

Scheme of the preparation of surface ordered structures. (A) PMMA-FR deposition, (B) UV laser irradiation, and (C) diffraction of white light on prepared periodical structure (on ripples).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4215891&req=5

Figure 2: Scheme of the preparation of surface ordered structures. (A) PMMA-FR deposition, (B) UV laser irradiation, and (C) diffraction of white light on prepared periodical structure (on ripples).
Mentions: After deposition, the PMMA-FR films were irradiated with KrF excimer laser beam (λ = 248 nm) under various angles with respect to film surface normal. This process is schematically depicted in Figure 2. At the surface of the thin polymer film, an interference between incident and reflected laser beam occurs which results in spatial redistribution of laser intensity along the sample surface [11]. As a result, surface ordered structures are formed. Diffraction under irradiation with white light (angle-dependent coloring of patterned area) indicates the quality of the created pattern. The left side of Figure 2 gives the sample photo before and after laser modification. The patterned area is clearly visible on the sample. Homogeneous distribution of diffracted light indicates regular periodicity and amplitude of prepared grating.

Bottom Line: The mechanism of surface ordered structure formation is attributed to polymer ablation, which is more pronounced in the place of higher light intensity.The smoothness of the underlying substrate plays a key role in the quality of surface ordered structure.Most regular grating structures were obtained on polymer films deposited on atomically 'flat' Si substrates.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Solid State Engineering, Institute of Chemical Technology, Prague 166 28, Czech Republic.

ABSTRACT
In this work, we describe laser modification of poly(methyl methacrylate) films doped with Fast Red ITR, followed by dopant exclusion from the bulk polymer. By this procedure, the polymer can be modified under extremely mild conditions. Creation of surface ordered structure was observed already after application of 15 pulses and 12 mJ cm(-2) fluence. Formation of grating begins in the hottest places and tends to form concentric semi-circles around them. The mechanism of surface ordered structure formation is attributed to polymer ablation, which is more pronounced in the place of higher light intensity. The smoothness of the underlying substrate plays a key role in the quality of surface ordered structure. Most regular grating structures were obtained on polymer films deposited on atomically 'flat' Si substrates. After laser patterning, the dopant was removed from the polymer by soaking the film in methanol.

No MeSH data available.


Related in: MedlinePlus