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Optical properties of Langmuir-Blodgett polydiacetylene thin films |
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| Authors: | F. Kaneko M. S. Dresselhaus M. F. Rubner M. Shibata and S. Kobayashi |
| Affiliation: | Department of Electronics, Niigata University, Niigata, Japan Department of Electrical Engineering and Computer Science and Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A. Department of Electronics, Niigata University, Niigata, Japan |
| Abstract: | The colour phase transition of Langmuir-Blodgett polydiacetylene (LB PDA) films is investigated as a function of annealing temperature. A new reversible colour change is observed for a short annealing time. Such a reversible property has not previously been reported in LB PDA films. The X-ray diffraction patterns show that the reversible property is closely related to the layer structure of the LB films. Furthermore, the ratio of the line intensities of the Raman peaks due to C≡C and C=C stretch modes changes with the annealing temperature. The colour phase transition of the LB PDA films is correlated with this ratio. Such phase transitions have also been observed in laser-annealed points of LB PDA films. From these results, a new optical device based on LB PDA films is proposed. Furthermore, the electrical properties of ion-irradiated LB PDA films are briefly reported. |
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