Here, we report the mixing behaviour of diacetylene monomer 10, 12-tricosadiynoic acid (TCDA) and rhodamine-800 (Rh8) using Langmuir–Blodgett (LB) technique. The presence of Rh8 affected the structures, phase behaviour as well as colorimetric properties of TCDA in the mixed films at air–water interface and onto solid support. The mixed LB films having TCDA molefraction ≥ 0.5 leads to multilayer formation, whereas multilayer formation was hardly observed for the films containing TCDA molefraction less than 0.5. It was observed that polymerization as well as phase change (blue to red) was possible only for multilayered films. Brewster angle microscopy, atomic force microscopy, and fluorescence inverted microscopy studies confirmed the formation of definite structures in the polymerized TCDA/Rh8 mixed films at air–water interface and onto solid support. Structure of TCDA polymer strands was largely influenced by the presence of Rh8 in the mixed films. Interestingly, energy transfer occurred from TCDA in red phase to Rh8 in the mixed films with TCDA molefraction greater than 0.4. Maximum energy transfer efficiency was found to be 47.3% for the mixed LB film with TCDA molefraction 0.9.

中文翻译：

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空气-水界面和固体载体上聚二乙炔和罗丹明-800 混合膜的研究：荧光共振能量转移痕迹 (FRET)

在这里，我们使用 Langmuir-Blodgett (LB) 技术报告了丁二炔单体 10, 12-二十碳二炔酸 (TCDA) 和罗丹明-800 (Rh8) 的混合行为。Rh8 的存在影响了 TCDA 在空气-水界面和固体载体上的混合膜中的结构、相行为以及比色特性。TCDA 摩尔分数≥ 0.5 的混合 LB 薄膜导致多层形成，而对于含有小于 0.5 的 TCDA 摩尔分数的薄膜，几乎没有观察到多层形成。据观察，聚合以及相变（蓝色到红色）仅适用于多层薄膜。布鲁斯特角显微镜、原子力显微镜、荧光倒置显微镜研究证实了聚合的 TCDA/Rh8 混合膜在空气-水界面和固体载体上形成了明确的结构。TCDA 聚合物链的结构很大程度上受混合膜中存在的 Rh8 的影响。有趣的是，能量从红相中的 TCDA 转移到 TCDA 摩尔分数大于 0.4 的混合膜中的 Rh8。发现 TCDA 摩尔分数为 0.9 的混合 LB 膜的最大能量转移效率为 47.3%。