Molecular crystallization of rubrene thin films assisted by gold nanoparticles |
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Affiliation: | 1. Department of Energy Science, Sungkyunkwan University, Suwon, 16419, Republic of Korea;2. Department of Physics, Korea University, Seoul, 02841, Republic of Korea |
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Abstract: | We demonstrate that crystalline organic rubrene thin films can be obtained by a facile spin-coating method using gold (Au) nanoparticles (NPs). Dodecanethiol-functionalized Au NPs were dissolved with rubrene molecules in solvent and a thin film of Au/rubrene was prepared by a simple spin coating process. The results of confocal photoluminescence (PL) and absorption spectral mapping confirmed the local formation of orthorhombic crystalline structures of the Au/rubrene hybrid film, in contrast to the monoclinic structure of plain rubrene films. Further, the results of transmission electron microscopy (TEM) and X-ray diffraction analysis, as well as Raman spectroscopy measurements of the rubrene and Au/rubrene films suggested the formation of high crystalline Au/rubrene film. The molecular crystallization of the Au/rubrene hybrid film is attributed to the nucleation effect of the Au NPs. |
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Keywords: | Rubrene Nanoparticles Spin coating Raman PL Crystalline Nucleation |
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