| Summary: | 碩士 === 國立臺灣大學 === 高分子科學與工程學研究所 === 104 === In this study, a series of highly soluble two-dimensional conjugated copolymers with 2-octyldodecyl-bearing terthiophene-vinylene group as conjugated side chains were designed and synthesized successfully. All intermediates and the resulting copolymers were structurally characterized by nuclear magnetic resonance (NMR) spectroscopy, elemental analysis (EA) and mass spectrometry. Moreover, gel permeation chromatography (GPC), ultraviolet-visible spectrometer (UV-vis), X-ray diffractometer (XRD), photoelectron spectroscopy in air (PESA) and cyclic voltammetry (CV) were employed to determine their molecular weight characteristics, light absorption properties, crystallinity and energy levels, respectively. As expected, the introduction of electron-deficient nitrogen-containing heterocyclic rings, 2,1,3-benzothiadiazole (BTD) and newπ-expanded DPP (eDPP), into the polymer backbone effectively broadens the absorption spectrum and lowers both the HOMO and LUMO levels, leading to narrow bandgaps. More importantly, this novel eDPP fused ring considerably enhances the crystallinity of the copolymers.
In addition, these new two-dimensional conjugated polymers were blended with graphene oxide (GO) to generate catalytic systems for CO2 photo-reduction. The incorporation of 1 wt% of these polymers into GO as sensitizer substantially increases the reaction rate of the photocatalytic reduction of CO2 into methanol and acetaldehyde. Especially, the production rate of acetaldehyde of the OCP04/GO system is determined to be about 5 times higher than that of the pristine GO system.
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