To extend the π conjugation along backbone units is an effective way to tune the optoelectronic properties of conjugated polymers. In this work, to investigate the influence of the extended conjugation on photovoltaic properties of the polymer, we employed a two-step molecular optimization process, and a series of diketopyrrolopyrrole (DPP)-based conjugated polymers, PBDPP-1, PBDPP-2, and PBDPP-3, was prepared and applied in polymer solar cells. After this two-step optimization of molecular structure, the compatibility between the polymer and PC 71 BM becomes much better; as a result, bicontinuous phase separation with appropriate domain size can be formed in the blend of PBDPP-3/PC 71 BM. Therefore, the PBDPP-3/PC 71 BM-based device shows a short circuit current density (J sc ) of 16.25 mA/cm 2 , which is more than two times of that of the PBDPP-1/PC 71 BMbased device. In addition, the blend films processed by DIO/CB showed smoother surfaces as well as smaller domain size compared with the blend films processed by pure CB. The results in this work indicate that when conjugation of the DPPpolymer's backbone is extended in two dimensions the morphology of the active layers in photovoltaic device can be optimized effectively, and hence the overall efficiency can be improved from 2.83 to 6.18%.

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Ternary composites of polyaniline/graphene oxide/Fe3O4 (PANI/GO/Fe3O4) were synthesized by a simple method and the electromagnetic absorption properties of the composites were investigated in the paper.

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In this study, we fabricated a novel material composed of magnetic graphene oxide incorporated Fe3O4@polyaniline (Fe3O4@PANI-GO) using a modified Hummers’ method, solvothermal, and two-step polymerisation method. The resulting products were characterised by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), and X-ray diffraction (XRD). The results indicated that magnetic Fe3O4@PANI particles were successfully loaded onto the surface of the graphene oxide. Further Fe3O4@PANI-GO was investigated to remove bisphenol A(BPA), α-naphthol, and t-octyl-phenol (t-OP) from water samples by magnetic solid phase extraction. Under the optimal conditions, the Fe3O4@PANI-GO composite exhibited good adsorption capacity for t-OP, BPA, and α-naphthol, and the adsorption of these followed a pseudo-second-order kinetic model. Adsorption isotherms fit the Langmuir model, and the adsorption was an endothermic and spontaneous process. This work indicated that Fe3O4@PANI-GO earned great application prospect for removing phenolic contaminants from polluted water.

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