Production of biologically inert Teflon thin layers on the surface of allergenic metal objects by pulsed laser deposition technology |
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Authors: | Hopp B Smausz T Kresz N Nagy PM Juhász A Ignácz F Márton Z |
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Institution: | (1) Research Group on Laser Physics of the Hungarian Academy of Sciences, University of Szeged, 6720 Szeged, Dóm tér 9, Hungary, HU;(2) Department of Optics and Quantum Electronics, University of Szeged, 6720 Szeged, Dóm tér 9, Hungary, HU;(3) Department of General Physics, E?tv?s Loránd University, 1518 POB. 32, Hungary, HU;(4) Department of General Physics and Laser Spectroscopy, University of Pécs, 7624 Pécs, Ifjúság út 6, Hungary, HU |
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Abstract: | Allergic-type diseases are current nowadays, and they are frequently caused by certain metals. We demonstrated that the metal
objects can be covered by Teflon protective thin layers using a pulsed laser deposition procedure. An ArF excimer laser beam
was focused onto the surface of pressed PTFE powder pellets; the applied fluences were 7.5–7.7 J/cm2. Teflon films were deposited on fourteen-carat gold, silver and titanium plates. The number of ablating pulses was 10000.
Post-annealing of the films was carried out in atmospheric air at oven temperatures between 320 and 500 °C. The thickness
of the thin layers was around 5 μm. The prepared films were granular without heat treatment or after annealing at a temperature
below 340 °C. At 360 °C a crystalline, contiguous, smooth, very compact and pinhole-free thin layer was produced; a melted
and re-solidified morphology was observed above 420 °C. The adhesion strength between the Teflon films and the metal substrates
was determined. This could exceed 1–4 MPa depending on the treatment temperature. It was proved that the prepared Teflon layers
can be suitable for prevention of contact between the human body and allergen metals and so for avoidance of metal allergy.
Received: 12 June 2002 / Accepted: 13 June 2002 / Published online: 4 November 2002
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ID="*"Corresponding author. E-mail: bhopp@physx.u-szeged.hu |
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Keywords: | PACS: 81 15 Fg 81 05 Lg 68 55 Jk 68 60 -p |
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