Preparation of Optical Waveguide Devices with Polymer Nano-Assemblies for Molecular Sensing

本计画旨在探讨光波导在分子感测上的应用。聚合物纳米组装体由LB膜组成，并结合各种光学技术，如集成光波导和表面等离子体共振技术。主要研究结果如下：1.聚合物单分子膜在光波导中的应用利用LB技术在锥形石英波导上制备了甲基丙烯酸9-蒽甲酯（AMMA）与新戊基甲基丙烯酰胺（nPMA）的共聚物单分子膜，并利用集成光波导技术对共聚物（p（nPMA-AMMA））单分子膜的光谱特性进行了精确监测。与透射UV-Vis光谱相比，吸光度的大小增加了200倍。因此，p（nPMA-AMMA）LB膜中的光交联反应容易且准确地表征为辐照时间的函数。2.聚合物LB膜中正性光致变色的原位观察 关于我们 B膜由已知形成稳定单分子膜的N-十二烷基丙烯酰胺（DDA）和光降解单体叔丁基-4-乙烯基苯基碳酸酯（tVPC）组成。当在空气中用深紫外光照射共聚物LB膜（p（DDA/tBVPC））时，发生光分解，LB膜厚度逐渐减小。另一方面，在氩气气氛下辐照，薄膜厚度没有明显变化.基于层间电荷转移络合物相互作用的光开关研究了芘分子在聚合物LB膜中的荧光猝灭。使用电子给体分子N，N-二甲基苯胺和电子受体分子1，3-二硝基苯。聚合物LB膜中的给体和受体分子通过层间电荷转移猝灭了芘的荧光。这意味着新的瞬时物种产生。利用表面等离子体共振构型中的电荷转移反应实现了光开关。用泵浦光（>350 nm）反复调制探测光强度（441.6 nm）。少

This project aims at optical waveguide application for molecular sensing. Polymer nano-assemblies consisting of LB films was used and coupled with various optical techniques, such as integrated optical waveguide and surface plasmon resonance technique. The findings were summarized as follows;1.Optical Waveguide Application for Polymer MonolayerMonolayers from the copolymer of 9-anthrylmethyl methacrylate (AMMA) with neopentyl methacrylamide (nPMA) were deposited on a tapered quartz waveguide by Langmuir-Blodgett (LB) technique, and spectroscopic properties of the copolymer (p(nPMA-AMMA)) monolayer were precisely monitored by integrated optical waveguide technique. Magnitude of absorbance increased by a factor of 200 compared with transmission UV-Vis spectroscopy. Consequently, photo-cross-linking reaction in p(nPMA-AMMA) LB films was characterized easily and accurately as a function of irradiation time.2.In situ Observation for Positive-tone Photopatterns in Polymer LB FilmsCopolymer L … More B films composed of N-dodecylacrylamide (DDA) which is known to form a stable monolayer and a photo-degradable monomer, tert-butyl-4-vinylphenyl carbonate (tVPC), were prepared. When deep UV light was irradiated onto the copolymer LB films (p(DDA/tBVPC)) in air, the photodecomposition took place, consequently the thickness in the LB film was gradually decreased. On the other hand, there were no significant changes in the thickness with the irradiation at the argon atmosphere.3. Optical Switching Devices based on Interlayer Charge-Transfer Complex InteractionFluorescence quenching of pyrene molecules in polymer LB films was studied. An electron donor moleucule N, N-dimethylaniline and an electron acceptor molecule 1,3-dinitrobenzene were used. Pyrene fluorescence was quenched by donor and acceptor molecules in polymer LB films through inter layer charge-transfer. This implies that new transient species generate. Optical switching was demonstrated by using the charge-transfer reaction in surface plasmon resonance configuration. The probe beam intensity (at 441.6 nm) was modulated repeatedly by pumping light (>350 nm). Less