Optical Spectra of Polygermane/Mesoporous Silica Nanocomposites
| Autor: | Shozo Suto, N. Kozlova, Kunio Mochida, N. Ostapenko, Masato Nanjo |
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| Rok vydání: | 2008 |
| Předmět: |
chemistry.chemical_classification
Nanocomposite Materials science Polymers and Plastics Organic Chemistry Analytical chemistry Polymer Atmospheric temperature range Mesoporous silica Condensed Matter Physics Fluorescence Nanopore chemistry Materials Chemistry Organic chemistry Absorption (chemistry) Thin film |
| Zdroj: | Macromolecular Symposia. 265:148-155 |
| ISSN: | 1521-3900 1022-1360 |
| Popis: | The monitoring of poly(di-n-hexylgermane) (PDHG) optical spectra in a variety of structures ranging from a bulk film to a nanosize polymer confined into a nanopore of SBA-15 was performed using the fluorescence and fluorescence excitation spectra in the temperature range from 5 to 240 K as well as the absorption and FTIR spectra at room temperature. The observed data were compared with those obtained for poly(di-n-hexylsilane). It was shown that PDHG film absorption and fluorescence spectra strongly depend on the polymer thickness and consist of a number of bands which were assigned to centers with different amount of trans- and gauche- conformers of the polymer chains. Conformations of the polymer chains found in a thin film and in a 10 nm pore are similar while differing from the conformations of a thick film. Optical spectra of the confined PDHG are blue-shifted relative to those of a thin film. The PDHG polymer chain conformation becomes disordered with the decrease of the polymer film thickness and the nanopore size from 10 to 6 nm. |
| Databáze: | OpenAIRE |
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