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KrF Pulsed Laser Ablation of Thin Films Made from Fluorinated Heterocyclic Poly(Naphthyl-Imide)s

Published online by Cambridge University Press:  13 April 2012

Mariana-Dana Damaceanu ,
Radu-Dan Rusu ,
Mihaela Adriana Olaru ,
Daniel Timpu  and
Maria Bruma
Mariana-Dana Damaceanu*
Affiliation:
“Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Aleea Grigore Ghica Voda 41A, Iasi-700487, Romania
Radu-Dan Rusu
Affiliation:
“Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Aleea Grigore Ghica Voda 41A, Iasi-700487, Romania
Mihaela Adriana Olaru
Affiliation:
“Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Aleea Grigore Ghica Voda 41A, Iasi-700487, Romania
Daniel Timpu
Affiliation:
“Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Aleea Grigore Ghica Voda 41A, Iasi-700487, Romania
Maria Bruma
Affiliation:
“Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, Aleea Grigore Ghica Voda 41A, Iasi-700487, Romania
*
Corresponding author. E-mail: damaceanu@icmpp.ro
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Abstract

Among the many aspects of laser ablation, development of conical structures induced by excimer laser radiation on polyimide surfaces has been thoroughly investigated. Because the mechanisms that produce these surface textures are not fully understood, two theories, photochemical bond breaking and thermal reaction, have been introduced. Here we present the first study of ultraviolet laser ablation behavior of thin films made from fluorinated poly(naphthyl-imide)s containing oxadiazole rings and the investigation of the mechanism of cone-like structure formation at two laser fluences, 57 and 240 mJ/cm2. The morphology of thin films before and after laser ablation was studied by using various spectroscopy techniques such as Fourier transform infrared spectroscopy, time-resolved emission and X-ray photoelectron spectroscopy, atomic force microscopy, and contact angle measurements. All of the data suggest impurities shielded at low fluence radiation (57 mJ/cm2) and a radiation hardening process at high value fluence (240 mJ/cm2), which are proposed as the main mechanisms for laser ablation of our polyimide films, and we bring evidence to support them.

Keywords

thermostable polymerstough filmsUV laser radiationlong periodic structurescarbon-enriched layersuperhydrophobic surface
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 18 , Issue 3 , June 2012 , pp. 545 - 557
Copyright
Copyright © Microscopy Society of America 2012

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