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Synthesis and characterization of an electro-deposited polyaniline ..

Synthesis and characterization of new polyaniline/nanotube composites

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Synthesis and characterization of polyaniline ..

Kargirwar SR, Thakare SR, Choudhary MD, Kondawar SB, Dhakate SR. Morphology and electrical conductivity of self-doping polyanilines synthesized via self-assembly process. Adv Mat Lett 2011, 2: 397-401.

Synthesis and characterization of polyaniline/activated carbon composites ..

PANI/ZnO nanocomposites were synthesized via in situ oxidative polymerization of aniline monomer. Different weights of ZnO nanostructures prepared in the absence and presence of surfactant were added to the aniline prior to polymerization. The surface morphology changed with the addition of ZnO nanostructures. This is well evident from the SEM images of the nanocomposites. The surfactant sodium lauryl sulphate (SLS) was added to the aniline solution. This acted as a stabilizer and contained amine group which was grafted on the growing polymer (PANI) chains. Moreover, it assured a good dispersion of ZnO nanoparticles in the PANI matrix along with embedding them in the polymer chains. The surfactant also promotes the micelle formation and oxidation reaction. This is well represented in the FTIR spectra of polyaniline and nanocomposites. The UV-visible spectra demonstrated the shifting and change in the intensity of the peaks which confirmed the effective interaction of ZnO nanostructures with the polyaniline through the hydrogen bonding between the imine group (–NH) of PANI and hydroxyl (–OH) group of ZnO nanostructures. The calculated optical band gap energy values of nanocomposites were found to be dependent on the weight percent of ZnO nanostructures embedded in the polymer matrix. The observations show that PANI/ZnO nanocomposites can be used potentially in molecular electronics and optical devises. It was concluded that the conductivity of ZnO nanocomposites initially increased and then decreased with the increase in the content of ZnO nanostructures due to the fact that increased % of ZnO nanostructures hinders the carrier transport between the different conjugated chains of polyaniline (PANI).

Synthesis and characterization of Se doped polyaniline.

31/12/2017 · In-situ synthesis and characterization of polyaniline ..

Polyaniline in its emeraldine salt form was synthesized by chemical method from aniline monomer in the presence of HCl mixed with LiCl and Ammonium-persulphate (APS) as oxidant. Then a portion of samples was de-doped with NH3 solution and another equal portion was separately post doped with secondary dopants such as FeCl3 and KMnO4 respectively. Finally the dried samples of polyaniline prepared in all its three different forms were characterized by ultraviolet – visible (UV-Vis) spectroscopy, Fourier- Transform Infrared (FTIR) spectroscopy and electrical conductivity measurement. FT-IR and UV-Vis spectra confirmed the expected structural modification upon doping, undoping and post doping processes of the polymer. The influences of secondary doping on the electrical conductivity were also investigated from their spectroscopic data and the dramatic rise in conductivity was said to be induced from the secondary doping is attributed by structural rearrangement from a compact-coil form of PANI to a more expanded conformation. The result also shows that secondary doping increased the conjugation. Their measured electrical conductivities were from 0.02 for undoped, 156 for primary doped form and increasing from 158 to 210 S/cm for those secondary doped polyaniline.

Ravikiran YT, Lagare MT, Sairam M, Mallikarjuna NN, Sreedhar B, Manohar S, MacDiarmid AG. Synthesis, characterization and low frequency AC conduction of polyaniline/niobium pentoxide composites, Synth Met. 2006, 156:1139-1147

Synthesis and Characterization of Se doped ..

Tong Xue, Xin Wang, Sang Kyu Kwak, and Jong-Min Lee*, "Synthesis and Application of Mesoporous Polyaniline (PANI)-Se0.5Te0.5 Dual-Layer Electrodes by Lyotropic Liquid Crystalline Templates as Direct Cast",

Polyaniline/ZnO nanocomposites were prepared by in situ oxidative polymerization of aniline monomer in the presence of different weight percentages of ZnO nanostructures. The steric stabilizer added to prevent the agglomeration of nanostructures in the polymer matrix was found to affect the final properties of the nanocomposite. ZnO nanostructures of various morphologies and sizes were prepared in the absence and presence of sodium lauryl sulphate (SLS) surfactant under different reaction conditions like in the presence of microwave radiation (microwave oven), under pressure (autoclave), under vacuum (vacuum oven), and at room temperature (ambient condition). The conductivity of these synthesized nanocomposites was evaluated using two-probe method and the effect of concentration of ZnO nanostructures on conductivity was observed. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and UV-visible (UV-VIS) spectroscopy techniques were used to characterize nanocomposites. The optical energy band gap of the nanocomposites was calculated from absorption spectra and ranged between 1.5 and 3.21eV. The reported values depicted the blue shift in nanocomposites as compared to the band gap energies of synthesized ZnO nanostructures. The present work focuses on the one-step synthesis and potential use of PANI/ZnO nanocomposite in molecular electronics as well as in optical devices.

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  • Synthesis and Characterization of CdSe Nanoparticles …

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  • Synthesis and Characterization of In-Doped SnO 2 (ITO) Nanowires ..

    Synthesis and Characterization of Polyaniline Microspheres Doped with Ferrocene Sulfonic Acid

  • Journal of Nanoscience and Nanotechnology

    MATERIALS FOCUS

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PDF Downloads : Oriental Journal of Chemistry

shows the surface morphology of the as-synthesized polyaniline. Figures – are SEM images of the nanocomposite with varying percentage of ZnO nanostructures. It is evident from the SEM micrographs that the morphology of polyaniline has changed with the introduction of ZnO nanostructures of different morphologies. Figures and depict the uniform distribution of spherical and nanorod shaped ZnO into the polymer matrix, respectively. shows the incorporation of ZnO nanoflowers synthesized using SLS under pressure into the polymer matrix. Thus, it was interpreted that there was an effective interaction of ZnO nanostructures of varied morphology with polyaniline matrix.

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represents the TEM image of polyaniline network containing chains of the polymer whereas Figures – represent the TEM images of PANI/ZnO nanocomposites containing different weight percentages of ZnO nanostructures synthesized via surfactant free and surfactant assisted methods. is a TEM image of nanocomposite containing 60% ZnO nanostructures synthesized using microwave method in the absence of surfactant, SLS. It has been observed that spherical ZnO nanoparticles in the size range of 20–25nm have been dispersed in the polymer matrix. The dark spots in the TEM image are the nanoparticles. Figures and show the TEM images where ZnO nanostructures synthesized in the presence of SLS under microwave (60% ZnO) and under pressure (40% ZnO) have been well entrapped in the chains of polyaniline. Similarly, in the Figures and , 60% of ZnO nanostructures synthesized under vacuum (UV) and 40% of ZnO nanostructures synthesized at room temperature (RT) methods have been embedded in the matrix of polyaniline. Thus, Figures – indicate that the surface of ZnO nanostructure has interaction with the PANI chains.

Synthesis and characterization ..

In the present work, polyaniline (PANI)/ZnO nanocomposites have been synthesized by a single-step process by loading different weights of ZnO nanostructures synthesized in the presence and absence of sodium lauryl surfactant (SLS) and characterized for their structural and optical properties. Further, the conductivity of the nanocomposites has been evaluated using two-probe method.

performance of polyaniline films doped ..

Figures and represent the UV-VIS absorption spectra of the synthesized polyaniline (PANI) and polyaniline (PANI)/ZnO nanocomposites. In , polyaniline (PANI) exhibits two broad absorption peaks at 253.2nm and 379.2nm. This peak corresponds to the π-π* transition of the benzenoid ring and constitutes the typical emeraldine salt spectrum. A little red shift was observed for the nanocomposites containing 60% ZnO nanostructures (synthesized in the absence and presence of surfactant SLS under microwave) and 40% ZnO nanostructures (synthesized using SLS under pressure), respectively. This red shift was due to the interaction of polyaniline with ZnO. In the absorption spectrum of nanocomposite containing 60% ZnO nanostructures (synthesized using SLS under vacuum), a large red shift was observed and the broad peaks appeared at 298.0nm, 342.7nm, and 776.8nm. The peak at 776.8nm could be assigned to the polaron band transitions. The appearance of this peak in the absorption spectra showed that the polymer chains which have coiled conformation (less conjugation) in chloroform extended causing dispersion and strong interaction between adjacent polarons. Also, it was confirmed that in this case there was strong interaction of ZnO nanoparticles with the polyaniline. Similarly, in , a large red shift was observed and a broad peak appeared at 821.0nm in addition to two other peaks.

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