Molecular Orientation Control in p-Hexaphenyl Films and Their Electrical/Optical Property Study
碩士 === 國立中央大學 === 化學研究所 === 91 === Abstract The growth of p-hexaphenyl films by thermal evaporation on clean gold surface and self-assembled monolayer (SAM) modified gold surface was investigated by reflection absorption IR spectroscopy, NEXAFS technique and X-Ray diffraction. The results...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2003
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| Online Access: | http://ndltd.ncl.edu.tw/handle/50990764595452937205 |
| Summary: | 碩士 === 國立中央大學 === 化學研究所 === 91 ===
Abstract
The growth of p-hexaphenyl films by thermal evaporation on clean gold surface and self-assembled monolayer (SAM) modified gold surface was investigated by reflection absorption IR spectroscopy, NEXAFS technique and X-Ray diffraction. The results showed that p-hexaphenyl molecules oriented parallel to clean gold whereas they oriented perpendicular to SAM-modified Au surface, irrespective of the terminal functional group of the SAM involved. The film with flat-lying molecules and the film with perpendicular molecules exhibited very different fluorescence intensity, with flat-lying molecules showing 10~100 times higher intensity.
Oriented thin films of p-hexaphenyl molecules were also prepared by vacuum deposition on rubbed polymethylene surfaces. Reflection absorption IR spectra showed that the p-hexaphenyl molecules were oriented parallel to the rubbed surface. AFM microscopy showed that crystals of p-hexaphenyl are aligning perpendicular to the rubbing direction. The alignment effect may come from interaction between oriented polymer chains and the molecules.
Thus orientation control of organic semiconducting p-hexaphenyl in three dimensions can be achieved by various substrates. Use of these films in fabricating organic electronic devices will be explored further.
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