Physical and chemical modifications of PET surface using a laser-plasma EUV source |
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Authors: | A Bartnik H Fiedorowicz R Jarocki J Kostecki M Szczurek A Biliński O Chernyayeva J W Sobczak |
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Institution: | (1) Department of Biological Systems Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA;(2) Center for Plasma-Aided Manufacturing, University of Wisconsin-Madison, Madison, WI 53706, USA;(3) Food Research Institute, University of Wisconsin-Madison, Madison, WI 53706, USA;(4) Department of Bacteriology, University of Wisconsin-Madison, Madison, WI 53706, USA;(5) Nerites Corporation, 505 South Rosa Road, Suite 123, Madison, WI 53719, USA |
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Abstract: | Extreme ultraviolet (EUV) radiation is the electromagnetic radiation ranging from vacuum ultraviolet to soft X-rays. A single
EUV photon carries enough energy to ionize any atom or molecule. The penetration depth of the radiation in any material is
very short, ranging from tens to hundreds nanometers. Intense EUV pulses can remove material from the surface or modify its
morphology or/and chemical structure. In this work, the radiation from a laser-plasma EUV source based on a double-stream
gas-puff target was used for surface modification of polyethylene terephthalate (PET). The PET samples were irradiated with
the EUV pulses emitted from krypton plasma and focused with a gold-plated ellipsoidal collector. The spectrum of the focused
radiation covered the wavelength range from 9 to 70 nm. The PET samples were irradiated for 1 s–2 min at a 10-Hz repetition
rate. Surface morphology of polymer samples after irradiation was investigated using a scanning electron microscope. Changes
in chemical surface structure of the irradiated samples were investigated using an X-ray photoelectron spectroscopy. Different
kinds of surface microstructures were obtained depending on the EUV fluence in a single pulse and the total EUV fluence. XPS
measurements also revealed a modification of the chemical structure. |
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