Polyaniline/Layered Zirconium Phosphate Nanocomposites: Secondary-Like Doped Polyaniline Obtained by the Layer-by-Layer Technique

2008 ◽  
Vol 8 (4) ◽  
pp. 1782-1789 ◽  
Author(s):  
Celly M. S. Izumi ◽  
Vera R. L. Constantino ◽  
Marcia L. A. Temperini
Keyword(s):  
Inorganic Material ◽  
Resonance Raman Spectroscopy ◽  
Oxidative Polymerization ◽  
Free Charge Carrier ◽  
Resonance Raman ◽  
Layer By Layer ◽  
X Ray Diffraction ◽  
Lbl Assembly ◽  
Aniline Polymerization

In the present work, nanocomposites of polyaniline (PANI) and layered α-Zr(HPO4)2˙H2O (α-ZrP) were prepared using two different approaches: (i) the in situ aniline polymerization in the presence of the layered inorganic material and (ii) the layer-by-layer (LBL) assembly using an aqueous solution of the polycation emeraldine salt (ES-PANI) and a dispersion of exfoliated negative slabs of α-ZrP. These materials were characterized spectroscopically using mainly resonance Raman scattering at four exciting radiations and electronic absorption in the UV-VIS-NIR region. Structural and textural characterizations were carried out using powder X-ray diffraction (XRD) and scanning electron microscopy (SEM). The polymer obtained by the in situ aniline polymerization is located primarily in the external surface of the inorganic material although aniline monomers were intercalated between α-ZrP interlayer regions before oxidative polymerization. Through resonance Raman spectroscopy, it was observed that the formed polymer has semiquinone units (ES-PANI) and also azo bonds (—N=N—), showing that this method results in a polymer with a different structure from the usual “head-to-tail” ES-PANI. The LBL assembly of pre-formed ES-PANI and exfoliated α-ZrP particles produces homogeneous films with reproducible deposition from layer to layer, up to 20 bilayers. Resonance Raman (λ0 = 632.8 nm) spectrum of PANI/ZrP LBL film shows an enhancement in the intensity of the polaronic band at 1333 cm–1 (νC—N˙+) and the decrease of the band intensity at 1485 cm–1 compared to bulk ES-PANI. Its UV-VIS-NIR spectrum presents an absorption tail in the NIR region assigned to delocalized free charge carrier. These spectroscopic features are characteristic of highly conductive secondary doped PANI suggesting that polymeric chains in PANI/ZrP LBL film have a more extended conformation than in bulk ES-PANI.

Preparation and properties of multilayered polymer/nanodiamond composites via an in situ technique

2014 ◽  
Vol 34 (5) ◽  
pp. 415-429 ◽  
Author(s):  
Rozina Ashraf ◽  
Ayesha Kausar ◽  
Muhammad Siddiq
Keyword(s):  
Conjugated Polymers ◽  
Oxidative Polymerization ◽  
Lithium Ion ◽  
Layer By Layer ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Polymer Lithium Ion Batteries ◽  
Exposed Surface Area

Abstract Compared to conventional materials, nanocomposites of conjugated polymers are found to have excellent performance due to a larger exposed surface area. In this study, polyaniline (PANi), polypyrrole (PPy), polythiophene (PTh) and polyazopyridine (PAP)/nanodiamonds (NDs) composites were efficiently synthesized by in situ oxidative polymerization. Physical characteristics of fabricated nanocomposites were explored using Fourier transform infrared spectroscopy (FTIR), energy dispersive X-ray (EDX) spectroscopy, field emission scanning electron microscopy (FESEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and X-ray diffraction (XRD). FTIR indicated layer-by-layer oxidative polymerization of various matrices on functional ND (F-ND) surfaces. FESEM revealed the fibrillar (web-like) morphology of multilayered nanocomposites having a granular arrangement of NDs. TGA of multilayered F-NDs/PAP/PANi/PTh showed 10% degradation at an enhanced temperature of 482°C compared with F-NDs/PANi/PPy/PTh (471°C). Improvement in glass transition of layered material was observed from 99°C (NDs/PANi/PPy/PTh) to 121°C (NDs/PAP/PANi/PTh). Functional filler also contributed towards the enhancement in the conductivity of NDs/PAP/PANi/PTh (5.7 S cm-1) relative to NDs/PANi/PPy/PTh (3.7 S cm-1) systems. New conducting composites are potentially important in various applications, including polymer lithium-ion batteries.

scholarly journals Synthesis of Polyaniline coated Graphene Oxide @ SrTiO3 Nanocube Nanocomposites for Enhanced Removal of Carcinogenic Dyes from Aqueous Solution

2016 ◽  
Author(s):  
Syed Shahabuddin ◽  
Norazilawati Muhamad Sarih ◽  
Muhammad Afzal Kamboh ◽  
Hamid Rashidi Nodeh ◽  
Sharifah Mohamad
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Methyl Orange ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Polymerization Method

The present investigation highlights the synthesis of polyaniline (PANI) coated graphene oxide doped with SrTiO3 nanocube nanocomposites through facile in-situ oxidative polymerization method for the efficient removal of carcinogenic dyes, namely, the cationic dye methylene blue (MB) and the anionic dye methyl orange (MO). The synthesised nanocomposites were characterised by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The adsorption efficiencies of graphene oxide (GO), PANI homopolymer and SrTiO3 nanocubes-doped nanocomposites were assessed by monitoring the adsorption of methylene blue and methyl orange dyes from aqueous solution. The adsorption efficiency of nanocomposites doped with SrTiO3 nanocubes were found to be of higher magnitude as compared with undoped nanocomposite. Moreover, the nanocomposite with 2 wt% SrTiO3 with respect to graphene oxide demonstrated excellent adsorption behaviour with 99% and 91% removal of MB and MO respectively, in a very short duration of time.

A Facile Synthesis of Poly(3-octylthiophene)-Titanium Dioxide Nanocomposite Particles in Supercritical CO2

2008 ◽  
Vol 8 (9) ◽  
pp. 4743-4746 ◽  
Author(s):  
Haldorai Yuvaraj ◽  
Min Hee Woo ◽  
Eun Ju Park ◽  
Yeong-Soon Gal ◽  
Kwon Taek Lim
Keyword(s):  
Titanium Dioxide ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Photoluminescence Quenching ◽  
Tem Analysis ◽  
Ir Studies ◽  
Transmission Electron ◽  
Ft Ir ◽  
Synthesized Materials

Poly(3-octylthiophene) (P3OT)-titanium dioxide (TiO2) nanocomposite powder where TiO2 was embedded with homogeneous dispersion was synthesized by in-situ chemical oxidative polymerization of 3-octylthiophene in the presence of TiO2 nanoparticles in supercritical carbon dioxide (scCO2), using ferric chloride as the oxidant. The synthesized materials could be obtained as dry powder upon venting of CO2 after the polymerization. The composites were subsequently characterized by FT-IR spectroscopy, transmission electron microscopy (TEM), X-ray diffraction studies (XRD), thermogravimetric analysis (TGA) and photoluminescence (PL). The incorporation of TiO2 in the composite was endorsed by FT-IR studies. TGA revealed enhanced thermal stability of P3OT/TiO2 nanocomposite compared to 3-octylthiophene. TEM analysis showed that well dispersed TiO2 nanoparticles in the polymer matrix. Photoluminescence quenching increased with increasing TiO2 concentration in the composite.

scholarly journals Resonance Raman Spectroscopy for In-Situ Monitoring of Radiation Damage

2007 ◽  
Author(s):  
A. Meents ◽  
R. L. Owen ◽  
D. Murgida ◽  
P. Hildebrandt ◽  
R. Schneider ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Radiation Damage ◽  
Resonance Raman Spectroscopy ◽  
Resonance Raman ◽  
In Situ Monitoring

Plasmon-induced photoelectrochemical water oxidation enabled by in situ layer-by-layer construction of cascade charge transfer channel in multilayered photoanode

2018 ◽  
Vol 6 (48) ◽  
pp. 24686-24692 ◽  
Author(s):  
Zhiping Zeng ◽  
Tao Li ◽  
Yu-Bing Li ◽  
Xiao-Cheng Dai ◽  
Ming-Hui Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Charge Transfer ◽  
Water Splitting ◽  
Water Oxidation ◽  
Graphene Quantum Dots ◽  
Layer By Layer ◽  
Lbl Assembly ◽  
Transfer Channel ◽  
Photoelectrochemical Water Oxidation

Cascade charge transfer between graphene quantum dots and Ag nanocrystals in photoelectrochemical water splitting was finely regulated by layer-by-layer (LbL) assembly.

scholarly journals Preparation and Microwave Absorption Properties of Polyaniline and Magnetite Core-Shell-Structured Hybrid

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Xuan Zhang
Keyword(s):  
Microwave Absorption ◽  
Photoelectron Spectroscopy ◽  
Microwave Absorption Property ◽  
Absorption Property ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Infrared Spectrophotometer ◽  
Aniline Polymerization

In this study, polyaniline and Fe3O4 (PAN@Fe3O4) hybrids are fabricated and their microwave absorption property is studied. PAN@Fe3O4 hybrids are fabricated by the in situ aniline polymerization at spherical of Fe3O4 which is prepared by the solvothermal process. Fourier-transform infrared spectrophotometer (FTIR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) are applied to confirm the composition of the fabricated PAN@Fe3O4 hybrids. The morphologies of PAN@Fe3O4 hybrids are studied by scanning electron microscope (SEM) and transmission electron microscopy (TEM). The content of polyaniline in the PAN@Fe3O4 hybrids is calculated by thermogravimetric analysis (TGA). The magnetic properties of PAN@Fe3O4 hybrids are characterized by vibrating sample magnetometer (VSM). The microwave absorption property of PAN@Fe3O4 hybrids are measured on a vector network analyzer. The research show that the microwave absorptions property of the obtained PAN@Fe3O4 hybrids can be adjusted by controlling the in situ aniline polymerization at spherical of Fe3O4.

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