Micro-orientation control of silicon polymer thin films on graphite surfaces modified by heteroatom doping
| Autor: | Iwao Shimoyama, Norie Hirao, Yuji Baba |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Ion beam Silicon Doping Analytical chemistry General Physics and Astronomy chemistry.chemical_element 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences XANES 0104 chemical sciences Surfaces Coatings and Films Photoemission electron microscopy chemistry Surface modification Organic chemistry Graphite Thin film 0210 nano-technology |
| Zdroj: | Applied Surface Science. 405:255-266 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.01.297 |
| Popis: | Near-edge X-ray absorption fine structure (NEXAFS) spectroscopy is applied to study orientation structures of polydimethylsilane (PDMS) films deposited on heteroatom-doped graphite substrates prepared by ion beam doping. The Si K-edge NEXAFS spectra of PDMS show opposite trends of polarization dependence for non irradiated and N2+-irradiated substrates, and show no polarization dependence for an Ar+-irradiated substrate. Based on a theoretical interpretation of the NEXAFS spectra via first-principles calculations, we clarify that PDMS films have lying, standing, and random orientations on the non irradiated, N2+-irradiated, and Ar+-irradiated substrates, respectively. Furthermore, photoemission electron microscopy indicates that the orientation of a PDMS film can be controlled with microstructures on the order of μm by separating irradiated and non irradiated areas on the graphite surface. These results suggest that surface modification of graphite using ion beam doping is useful for micro-orientation control of organic thin films. |
| Databáze: | OpenAIRE |
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