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Author: Mika, Filip × Start date: 2015 × WGL Institute: INP ×

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Now showing 1 - 2 of 2
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    Making Sense of Complex Carbon and Metal/Carbon Systems by Secondary Electron Hyperspectral Imaging
    (Weinheim : Wiley-VCH, 2019) Abrams, Kerry J.; Dapor, Maurizio; Stehling, Nicola; Azzolini, Martina; Kyle, Stephan J.; Schäfer, Jan; Quade, Antje; Mika, Filip; Kratky, Stanislav; Pokorna, Zuzana; Konvalina, Ivo; Mehta, Danielle; Black, Kate; Rodenburg, Cornelia
    Carbon and carbon/metal systems with a multitude of functionalities are ubiquitous in new technologies but understanding on the nanoscale remains elusive due to their affinity for interaction with their environment and limitations in available characterization techniques. This paper introduces a spectroscopic technique and demonstrates its capacity to reveal chemical variations of carbon. The effectiveness of this approach is validated experimentally through spatially averaging spectroscopic techniques and using Monte Carlo modeling. Characteristic spectra shapes and peak positions for varying contributions of sp2-like or sp3-like bond types and amorphous hydrogenated carbon are reported under circumstances which might be observed on highly oriented pyrolytic graphite (HOPG) surfaces as a result of air or electron beam exposure. The spectral features identified above are then used to identify the different forms of carbon present within the metallic films deposited from reactive organometallic inks. While spectra for metals is obtained in dedicated surface science instrumentation, the complex relations between carbon and metal species is only revealed by secondary electron (SE) spectroscopy and SE hyperspectral imaging obtained in a state-of-the-art scanning electron microscope (SEM). This work reveals the inhomogeneous incorporation of carbon on the nanoscale but also uncovers a link between local orientation of metallic components and carbon form.
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    Liquid assisted plasma enhanced chemical vapour deposition with a non-thermal plasma jet at atmospheric pressure
    (Amsterdam [u.a.] : Elsevier, 2016) Schäfer, Jan; Fricke, Katja; Mika, Filip; Pokorná, Zuzana; Zajíčková, Lenka; Foest, Rüdiger
    The present study introduces a process for the synthesis of functional films onto substrates directly from the liquid phase. The reported method is based on the initialization of the synthesis by means of an atmospheric pressure plasma jet operating with argon above a thin liquid film of the starting material. The process is demonstrated by the formation of a thin, solid SiOx film from siloxane-based liquid precursors. Changes in the chemical properties of the precursor were studied in-situ during the polymerization process on the diamond crystal by using Fourier transform infrared spectroscopy The elemental composition of the SiOxCy films was analyzed by X-ray photoelectron spectroscopy (XPS). Furthermore, XPS was applied to study the effect of post-annealing processes on the composition of the films. The obtained deposits exhibit a low concentration of carbon groups. The amount of hydroxyl groups and interstitial water can be reduced significantly by post-process annealing of the films.