Preparation and fluorescent chemosensory properties of carbazole-based conjugated polymer composites containing diketopyrrolopyrrole groups

• Main Authors: Chen-Han Lin, 林承翰
• Other Authors: Po-Chih Yang
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/36298167332123693796

碩士 === 元智大學 === 化學工程與材料科學學系 === 105 === Novel fluorescent conjugated polymer composites featuring high sensitivity for Fe3+ ion were prepared using binary blends of poly(9,9-dihexylfluorene-alt-2-(9H-carbazol-9-yl)acetic-acid) (PFCAOH) and a diketopyrrolopyrrole (DPP) derivative. The fluorene and carbazole moieties were designed to exhibit fluorescence (fluorescence resonance energy transfer (FRET) donor). However, the DPP was used as FRET acceptor and recognition unit for and Fe3+. The intermolecular interaction between PFCAOH and DPP was investigated using FT-IR, UV and PL spectra. The effects of the DPP structure on the optical and chemosensory properties of the polymer composites were investigated. The conjugated polymer composite spectra had strong emission band at approximately 540‒554 nm when in a tetrahydrofuran (THF) solution, attributable to the FRET between PFCAOH and DPP units. The emission colors of polymer composites in Fe3+ aqueous solutions changed from blue to yellow because of FRET from (PFCAOH) (donor) to DPP (acceptor). Photoluminescence titrations demonstrated that the DPP and PFCAOH blended with 50% DPP showed high sensitivity toward Fe3+, with the Stern-Volmer constants of 1.78 × 104 M-1 and 1.68 × 104 M-1, respectively. The prepared fluorescent conjugated polymer composites can be used as chemosensory sensors and have potential for application in multifunctional environment sensing devices.