Resonant surface enhanced Raman scattering by ultra thin Langmuir-Blodgett polydiacetylene polymer films |
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| Affiliation: | 1. Department of Mechanical Engineering, National Yang Ming Chiao Tung University, No. 1001, Ta Hsueh Road, Hsinchu 300, Taiwan;2. Department of Mechanical Engineering, National Chiao Tung University, No. 1001, Ta Hsueh Road, Hsinchu 300, Taiwan;3. Department of Physics, National Chung Cheng University, Chia-Yi, Taiwan;4. Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan |
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| Abstract: | Using resonant Raman scattering and surface enhanced Raman scattering techniques, changes in the structural and electronic properties of Langmuir-Blodgett (L-B) polydiacetylene films were observed as film thicknesses were increased from one monolayer (or one bilayer) to several bilayers. The L-B films, starting with a single monolayer (or one bilayer) in a disordered “red” phase, were found to change into a mixed phase (ordered “blue” and disordered “red”) as one or more additional bilayers were deposited. This is the first observation of a “disorder to order” transformation in a L-B film. The observed effect is attributed to the ordering brought about by interactions between the initial and subsequent L-B PDA bilayers. |
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