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Mechanical properties of Cr-DLC layers prepared by hybrid laser technology
Písařík, Petr ; Jelínek, Miroslav ; Remsa, J. ; Tolde, Z.
Diamond like carbon (DLC) layers have excellent biological properties for use in medicine for coating implants, but poor adhesion to biomedical alloys (titanium alloys, chromium alloys and stainless steel). The adhesion can be improved by doping the DLC layer by chromium, as described in this article. Chromium doped diamond like carbon layers (Cr DLC) were deposited by hybrid deposition system using KrF excimer laser (deposition diamond like carbon - graphite target) and\nmagnetron sputtering (deposition chromium - chromium target). Carbon and chromium contents were determined by wavelength dispersive X-ray spectroscopy.\n
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DLC/TI thin films properties prepared by hybrid laser technologies
Mikšovský, Jan ; Jelínek, Miroslav ; Písařík, Petr ; Kocourek, Tomáš ; Remsa, J. ; Jurek, Karel
Layers of diamond-like carbon are usable in many fields of industry as well as in medicine. Many scientific groups have worked with different types of deposition techniques to prepare DLC layers with improved or unique properties. The DLC properties could be improved by various dopations. In this study, we focused on DLC layers doped by titanium, prepared by hybrid laser depositions. Two techniques were used: Dual pulse laser deposition (DualPLD) and pulse laser deposition in combination with magnetron sputtering (PLD/MS). Preliminary tests for morphology, wettability, adhesion, hardness, corrosion, friction and wearability were examined. DLC samples were prepared on Si(100) wafer and on Ti6Al4V alloy substrates with titanium concentration from pure up to 25 at.%. Friction of the prepared layers ranged from 0.09 to 0.18. The films exhibited very low wear for loads 1 N and 2 N.\n
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Scanning thermal microscopy of thermoelectric pulsed laser deposited nanostructures
Vaniš, Jan ; Zelinka, Jiří ; Zeipl, Radek ; Jelínek, Miroslav ; Kocourek, Tomáš ; Remsa, Jan ; Navrátil, Jiří
New materials with high possible figure of merit ZT are of high interest as a promising candidates for thermoelectric applications such as energy harvesting. Miniaturization of such systems tends toward developing of the suitable characterization method with nanometer resolution ability. In our contribution, we present the development and experimental results of a simple scanning probe microscopy method for the relative thermal conductivity characterization. The possibility of the setup is demonstrated on the set of different thin thermoelectric layers grown from hot pressed targets by pulsed laser deposition on the reference Si substrate. All the measurements were performed on the commercial Veeco Multimode scanning AFM/STM microscope with home developed controller and by using PicoCal Inc. bolometer probes with tungsten resistive path. All the experiments were done in the air at the ambient condition. Additional sample treatment for the measurement will be also briefly described
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Study of biocompatible layers TiO.sub.2./sub./Si using FTIR spectroscopy
Zezulová, M. ; Remsa, Jan ; Jelínek, M.
There has been a great interest in research regarding titanium dioxide, especially in form of thin layers. One of the methods used to characterize this material is Fourier Transform Infrared Spectroscopy (FTIR). In this paper we report FTIR measurement results of TiO2 layers prepared by Pulsed Laser Deposition method. The layers were created on silicon (111) substrates (1x1 cm). FTIR spectrometer is based on absorption of infrared radiation and the interference process is implemented instead of classical dispersion method. This kind of spectrometer requires mathematical method of Fourier transform to gain classical spectral image. To see composition and crystalline structure the spectral region is frequently set to 600-100 cm-1. Around 50 samples were measured. Most samples were measured from different angles of incidence and with different setup (accessory). We were able to confirm different crystalline structure (anatase,rutile, and brookite)
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