Pulsed laser deposition of polytetrafluoroethylene-gold composite layers

Gabriella Kecskeméti, Tomi Smausz, Zsófia Berta, Béla Hopp, Gábor Szabó

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Abstract

PTFE-metal composites are promising candidates for use as sensor materials. In present study PTFE-Au composite layers were deposited by alternated ablation of pressed Teflon pellets and gold plates with focused beam of an ArF excimer laser at 6 J/cm2 fluence, while keeping the substrate at 150 °C temperature. The morphology and chemical composition of the ~3-4 μm average thickness layers was studied by electron microscopy and energy dispersive X-ray spectroscopy. The layers were mainly formed of PTFE gains and clusters which are covered by a conductive Au film. For testing the applicability of such layers as sensing electrodes, composite layers were prepared on one of the two neighbouring electrode of a printed circuit board. Cholesterol and glucose solutions were prepared using 0.1M NaOH solvent containing 10% Triton X-100 surfactant. The electrodes were immersed in the solutions and voltage between the electrodes was measured while a constant current was drawn through the sample. The influence of the analyte concentration on the power spectral density of the voltage fluctuation was studied.

Original languageEnglish
Article number20302
JournalEPJ Applied Physics
Volume68
Issue number2
DOIs
Publication statusPublished - Nov 1 2014

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics

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