Changing Contents of Carbon Hybridizations in Amorphous Hydrogenated Carbon Layers (a-C:H) on Sustainable Polyhydroxybutyrate (PHB) Exhibit a Significant Deterioration in Stability, Depending on Thickness
| Autor: | Lucas Beucher, Stefan Wehner, Barbara Hahn, Hadi Bazzi, Torben Schlebrowski, Christian B. Fischer |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Diffuse reflectance infrared fourier transform Scanning electron microscope incremental a-C:H deposition chemistry.chemical_element 02 engineering and technology Chemical vapor deposition synchrotron based surface techniques 01 natural sciences stress release phenomena Contact angle lcsh:QD241-441 X-ray photoelectron spectroscopy lcsh:Organic chemistry 0103 physical sciences chemical environment survey 010302 applied physics sp2/sp3 content evaluation General Medicine 021001 nanoscience & nanotechnology XANES Amorphous solid chemistry Chemical engineering acetylene plasma 0210 nano-technology Carbon |
| Zdroj: | C, Vol 5, Iss 3, p 52 (2019) C — Journal of Carbon Research Volume 5 Issue 3 |
| ISSN: | 2311-5629 |
| Popis: | PHB is a biodegradable polymer based on renewable raw materials that could replace synthetic polymers in many applications. A big advantage is the resulting reduction of the waste problem, as well as the conservation of fossil resources. To arrange it for various applications, the surface is arranged by plasma-enhanced chemical vapor deposition (PECVD) with amorphous hydrogenated carbon layers (a-C:H). Here, on a 50 µ m thick PHB-foil, a-C:H layers of different thicknesses (0&ndash 500 nm) were deposited in 50 nm steps. Surface topography was investigated by scanning electron microscopy (SEM), chemical composition by diffuse reflectance infrared Fourier transform (DRIFT) spectroscopy and wettability checked by contact angle. In addition, layers were examined by synchrotron supported X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS), which revealed thickness dependent changes of the sp2/sp3 ratio. With increasing thickness, even the topography changes show internal, stress-induced phenomena. The results obtained provide a more detailed understanding of the predominantly inorganic a-C:H coatings on (bio)polymers via in situ growth. |
| Databáze: | OpenAIRE |
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