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In this study, an electrochemical sensor for dopamine (DA) detection has been developed by a composite of poly(3,4-ethylenedioxyselenophene) (PEDOS) and nitrogen-doped graphene (PEDOS/N-Gr) using an in situ polymerization method. Its structure and properties were then compared with those of the composites of poly(3,4-ethylenedioxythiophene) (PEDOT)/nitrogen-doped graphene (PEDOT/N-Gr), which were prepared by the same methods. FT-IR, Raman, UV-vis, XPS, mapping and SEM investigated the structure and morphology of these composites. These revealed that PEDOS/N-Gr had a higher conjugation degree than PEDOT/N-Gr. The synergetic effect between PEDOS and N-Gr was beneficial for the formation of a homogenous surface coating. The cyclic voltammetry (CV) and differential pulse voltammetry (DPV) methods were conducted for electrochemical detection of DA. Compared with PEDOT/N-Gr, the PEDOS/N-Gr displayed an enhanced sensitivity and electrocatalytic performance for DA detection with linear ranges of 0.008–80 μM (PEDOT/N-Gr: 0.04–70 μM) and limits of detection (LOD) of 0.0066 μM (S/N = 3) (PEDOT/N-Gr: 0.018 μM (S/N = 3)).

In this paper, composites of poly (3,4-ethylenedioxythiophene) (PEDOT) and sulfonated cellulose (SC) were prepared by oxidative polymerization both in CHCl3 and H2O using different SC contents. The structures of composites (PEDOT/SC) were characterized by Ultraviolet–Visible absorption spectroscopy (UV–Vis), Fourier-transform infrared spectroscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and scanning electron microscopy. Electrochemical sensing using a PEDOT/SC-modified electrode was performed by the differential pulse voltammetry method. The results indicate that SC acted as a soft template for the formation of fibrous composites. Doping PEDOT with SC affected the conjugation degree and crystallinity of the resulting composites. The results showed that the PEDOT/SC composites obtained in H2O exhibited a higher electrochemical response than those produced in CHCl3. The composites obtained using 5 mg/mL SC in both reaction media had the best electrochemical performance. The electrochemical analysis showed that the limit of detection (LOD) for paracetamol was 0.258 μM and 0.0742 μM, with linear ranges of 0.02–4000 μM and 0.08–1580 μM for composites obtained using 5 mg/mL SC in H2O and CHCl3, respectively.

In this paper, the TiO2 nanorod arrays (TiO2 NRAs)/PEDOT-type conducting polymers composites were prepared by a simple electrochemical polymerization method and used as materials for ultraviolet (UV) photodetectors. The poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT) were selected as PEDOT-type conducting polymers. The structural, morphology and properties of photocurrent response of PEDOT/TiO2 NRAs and PProDOT/TiO2 NRAs were systematically studied. The results indicated that the polymer film grown on TiO2 NRAs surface presented three-dimensional porous network structure, and there was a strong interaction between polymer film and TiO2 NRAs. The results of the I–V characteristic curve showed that the composites had good rectification behavior. Due to the p-n heterojunction formed between n-type TiO2 NRAs and p-type polymer, both PEDOT/TiO2 NRAs and PProDOT/TiO2 NRAs had photocurrent response performance under 0 V and 1 V bias. Compared with the PEDOT/TiO2 NRAs, the PProDOT/TiO2 NRAs showed better UV photodetection performance, and the rise and fall time were respectively 26.2 s and 37.78 s at a bias of 1 V, while the rise and fall time were respectively 0.49 s and 8.79 s at a bias of 0 V. This research has certain potential and application value in the field of UV photodetectors.

The biocompatibility of surface-modified biphasic calcium phosphate (mBCP)/poly-L-Lactide (PLLA) biocomposite was investigated through a series of experiments in vitro and in vivo . Acute toxicity and short term systemic toxicity experiments revealed no toxicity of the materials. Hemolysis assay indicated the good blood compatibility of the composite. In cytotoxicity assay, L929 mouse fibroblasts could well differentiate and proliferate. Animal experiments in vivo were performed by implanting the materials into rabbits muscle for 8 weeks. The decreasing of inflammatory cells, the building of fibrous tissue layer as well as the growing of blood cells into materials indicated the nontoxicity of the composite. Based on the experiment results, surface-modified BCP/PLLA biocomposite is proven to have superior biocompatibility, which would be a promising bone repairing material.