| Summary: | 碩士 === 輔仁大學 === 化學系 === 102 === In this study, an organic functionalized graphene oxide (FGO) was modified with an o-methoxyaniline monomer, and then a series of poly(o-methoxyaniline) (POMA)/graphene-based nanocomposites were prepared by using an in situ oxidative polymerization method. The FGO and as-prepared nanocomposits were characterized by Fourier transform infrared (FTIR) spectroscopy, wide-angle powder X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The intercalated layers of FGO appeared with parallel orientation in the polymer matrix were observed in TEM images. The results are in consistent with XRD analysis, which increasing in diffraction intensity for the as-prepared POMA/FGO nanocomposites. Multiple interactions include chemical bonding and aromatic - interaction might attribute to the orientated morphology.
We also investigated the applications for the as-prepared nanocomposits in two fields include electrochemical capacitors and dye-sensitized solar cells (DSSCs). Electrochemical capacitor studies show that POMA/FGO nanocomposite exhibited a higher capacitance compared with pure POMA, in which the capacitance increased from 75 F/g to 117.7 F/g with the incorporation of 0.5 wt% FGO in the POMA polymer matrix. The electrochemical impedance spectrum (EIS) analysis showed decreasing of diameter for the semi-circle in Nyquist plot; and the charge transfer resistance (Rct) decreased from 13.23 to 8.89 Ω. The results indicate that the electrochemical behaviors of nanocompositescould be enhanced by the incorporation of FGO.
In DSSCs studies, we used pure POMA, organic acid doped POMA, and POMA/FGO nanocomposites employed as the counter electrodes (CEs) in DSSCs. The DSSC based on the organic acid doped POMA CE achieves a remarkable power conversion efficiency of 8.29%. The result indicates that the doped-POMA may have potential to replace the expensive Pt CE for DSSCs application. However, the power conversion efficiency of doped-POMA/FGO nanocomposites CEs was lower than that of doped-POMA. This may be attributed to a higher internal resistance was observed by the cyclic voltammetry studies for the doped-POMA/FGO nanocomposites as compared to the doped-POMA.
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