scholarly journals The importance of doping TiO2 into polypyrrol nanofibers to improve their optical sensitivity

2021 ◽  
Vol 2114 (1) ◽  
pp. 012057
Author(s):  
Omar A. Kareem ◽  
Sabri J. Mohameed ◽  
Isam M. Ibrahim
Keyword(s):  
Synergistic Effects ◽  
Electrochemical Polymerization ◽  
Oxidative Polymerization ◽  
Light Sensitivity ◽  
X Ray Diffraction ◽  
Light Power ◽  
Homogeneous Dispersion ◽  
Optical Sensitivity ◽  
Ft Ir ◽  
Nanocomposite Sensors

Abstract In this study Electrochemical polymerization was used to make polypyrrol nanofiber. The in situ chemical oxidative polymerization approach was used to create a nanocomposite of polypyrrole PPy-TiO2. To achieve homogeneous dispersion inside the PPy matrix, the TiO2 was dissolved and ultrasonically dispersed. The surface morphology of polypyrrol and PPy/TiO2 nanocomposites was studied using field emission scanning electron microscopy (FE-SEM), which revealed of a polypyrrol nanofibre network and showed that the TiO2 nanoparticles was well incorporated. The produced PPy/TiO2 nanocomposite was characterized using XRD (X-Ray diffraction) and FT-IR (Fourier Transform Infrared). The formation of TiO2 nanoparticales on a PPy layer matrix was discovered, as well as homogeneous dispersion of TiO2 inside the PPy matrix and considerable interaction between PPy and TiO2. The produced PPy/TiO2 nanocomposite sensors’ response was investigated towards of light-power sensitivity. The PPy/TiO2 synergistic effects improve the light sensitivity qualities of the photodetector. The maximium sensitivity of PPy/TiO2 was around (188 %) at 20% TiO2 concentration at a light power of 30 mW for a laser diode 720 nm, while the rise time and fall time was ≈ 2.5sec.

Structural and Optical Study of Chemically Synthesized Polyaniline

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
R. K. Shukla ◽  
Susheel Kumar Singh ◽  
Akhilesh Tripathi
Keyword(s):  
Fourier Transform ◽  
Oxidative Polymerization ◽  
Ultra Violet ◽  
Optical Study ◽  
X Ray Diffraction ◽  
Chemical Oxidative Polymerization ◽  
X Ray ◽  
Ft Ir ◽  
Polymerization Method ◽  
Scanning Electron

Polyaniline (PANI) is synthesized by chemical oxidative polymerization method. The, characterization were made using XRD (X-ray diffraction), FT-IR (Fourier transform spectroscopy), UV -vis (ultra-violet visible spectrophotometer) technique which confirms the synthesis of the Polyaniline. The surface morphology of Polyaniline was studied with scanning electron microscope (SEM).

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.

Preparation and Property of a Composite of PPy/MMT/PMMA

2013 ◽  
Vol 631-632 ◽  
pp. 150-153
Author(s):  
Ji Wei Cai ◽  
Hai Jun Niu ◽  
Xu Duo Bai
Keyword(s):  
Loss Function ◽  
Oxidative Polymerization ◽  
Dissipation Factor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structures And Properties ◽  
Key Factor ◽  
Ft Ir ◽  
The Relationship ◽  
Polymerization Method

Polypyrrole/montmorillonite (PPy/MMT) particles were synthesized using an oxidative polymerization method. Then the particles were added into polymethyl methacrylate (PMMA) as additives to prepare PPy/MMT/PMMA composite. The structures and properties of the composite were characterized by FT-IR, TGA, X-ray diffraction spectroscopy, and four–probe machine. The relationship between content of PPy/MMT and conductivity was analyzed. The result shows that the amount of PPy/MMT is a key factor for improving the conductivity of composite. Furthermore, dynamic mechanical (DM) properties of composite were studied. When the PPy/MMT content reach 0.2% of composite, the storage modulus, loss function modulus, dissipation factor get highest values.

Synthesis and Microwave Absorption Characteristics of Polyaniline

2013 ◽  
Vol 327 ◽  
pp. 53-57 ◽  
Author(s):  
Ding Guo Li ◽  
Wen Hua Lu ◽  
Cong Chen ◽  
Wei Rao ◽  
Yong Hong Xiong
Keyword(s):  
Microwave Absorption ◽  
Oxidative Polymerization ◽  
Ammonium Persulfate ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Infrared Spectrophotometer ◽  
Ft Ir ◽  
Hcl Concentration ◽  
Polymerization Method ◽  
Absorption Characteristics

This paper aims at reporting the synthesis and microwave absorption characteristics of polyaniline (PANI). The PANI nanoparticles were synthesized by chemical oxidative polymerization method with ammonium persulfate ((NH4)2S2O8, APS) as oxidant and hydrochloric acid (HCl) for protonation of aniline. For APS/aniline mol ratio of 1, HCl concentration of 1 mol/L, reaction temperature of 5°C, the reaction time of 6h, the obtained PANI exhibits the highest value（30.9 S·cm-1）of the electrical conductivity. The structure and morphology of PANI were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrophotometer (FT-IR), ultraviolet-visible spectrophotometer (UV-Vis) analysis ways. Microwave absorbing performances were investigated using wave-guide method with vector network analyzer in 2–18 GHz. The results showed that there is a maximum absorption peak with RL= -12.63dB at 13.61GHz，the value of RL ≤−10 dB is maintained from 11.38GHz to 18GHz for the sample of the thickness for 2mm.

scholarly journals Synthesis and Characterization of Polyaniline-Based Polymer Nanocomposites as Anti-Corrosion Coatings

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 653
Author(s):  
Francisco R. Rangel-Olivares ◽  
Elsa M. Arce-Estrada ◽  
Román Cabrera-Sierra
Keyword(s):  
Polymer Nanocomposites ◽  
Electrochemical Impedance ◽  
Oxidative Polymerization ◽  
Open Circuit ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Corrosion Properties ◽  
X Ray ◽  
Hydrochloric Acid Medium ◽  
Ft Ir

Polymer nanocomposites of polyaniline (PANI)-based metal oxides (SiO2, CeO2, and TiO2A) were synthesized by in situ chemical oxidative polymerization by rapid mixing in a hydrochloric acid medium to evaluate and compare their performance as anti-corrosion coatings on commercial 1018 steel in a 3.5% NaCl medium. The anti-corrosion coatings were developed by dispersing synthesized nanocomposites on an alkydalic resin (AR) for their subsequent electrochemical characterization. X-ray diffraction (XRD) analyses show that PANI has a certain degree of crystallinity in its structure. The incorporation of metal oxide (MO) nanoparticles (NPs) into the polymer matrix was confirmed by scanning electron microscopy and energy-dispersive X-ray spectroscopy (SEM-EDS) analyses, while the interaction of nanoparticles with PANI was proven by Fourier transform infrared (FT-IR) and ultraviolet-visible (UV-vis). Thermogravimetric analysis (TGA) reveals that nanoparticles infer greater resistance to the thermal decomposition of PANI. Finally, the use of open circuit potential (OCP) study, Tafel curves, and electrochemical impedance spectroscopy (EIS) showed that coatings made with TiO2A NPs exhibit the best anti-corrosion properties as compared to those synthesized with SiO2 and CeO2 NPs.

Studies on Polyaniline/Silver Molybdate Nanocomposites

2014 ◽  
Vol 13 (01) ◽  
pp. 1450002 ◽  
Author(s):  
K. Jacinth Mispa ◽  
P. Subramaniam ◽  
R. Murugesan
Keyword(s):  
Oxidative Polymerization ◽  
Hydrothermal Process ◽  
Photoluminescence Spectra ◽  
X Ray Diffraction ◽  
X Ray ◽  
Silver Molybdate ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

Silver molybdate nanoparticles were successfully prepared by the hydrothermal process. Polyaniline–silver molybdate nanocomposites were prepared by in situ chemical oxidative polymerization technique. Silver molybdate nanoparticles and the polymer samples were characterized by conductivity studies, Fourier transform infrared spectra (FT-IR), UV-visible spectra, photoluminescence spectra, X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). The electrical conductivity of PANI- Cl - increases when doped with silver molybdate nanoparticles and follows the percolation threshold.

Thermal Degradation Behavior of Polyaniline in Polyaniline/Tunsten Carbide Composite

2012 ◽  
Vol 581-582 ◽  
pp. 719-722
Author(s):  
Hui Huang ◽  
Ren Chun Fu ◽  
Zhong Cheng Guo
Keyword(s):  
Thermal Treatment ◽  
Oxidative Polymerization ◽  
Chain Scission ◽  
Ammonium Persulfate ◽  
X Ray Diffraction ◽  
Chemical Oxidative Polymerization ◽  
X Ray ◽  
Thermal Degradation Behavior ◽  
Ft Ir ◽  
Ft Raman

Polyaniline/tungsten carbide (PANI/WC) composite was synthesized by chemical oxidative polymerization of aniline using ammonium persulfate as the oxidant and thermal treated in air at 150°C, 250°C, 350°C and 450°C to 2 hours. The changes of structure, crystalline and conductivity were investigated by Fourier Transformed Infrared (FT-IR), Fourier Transformed Raman (FT-Raman), X-Ray Diffraction (XRD) and four-probe technique. The results showed that PANI/WC composite showed much-improved thermal stability compared to pure PANI. But the conductivity of PANI/WC is reduced to some extent (1.73 S/cm, the conductivity is reduced by about 82%) after thermal treated at 250°C, and dropped by 6 orders of magnitude (3.25×10-6S/cm) at 350°C. This may be explained by that only a fraction of dopant losses during thermal treatment at 250°C, but after thermal treatment at 350°C, along with cross-linking, chain scission and oxygen, resulting in destruction of crystal structure, decrease of the emeraldine sequence.

Highly transparent and soluble polyimides with synergistic effects of pyridine and cyclohexane

2017 ◽  
Vol 30 (4) ◽  
pp. 418-426 ◽  
Author(s):  
Jianan Yao ◽  
Chunbo Wang ◽  
Xiaogang Zhao ◽  
Hongwei Zhou ◽  
Chunhai Chen ◽  
...  
Keyword(s):  
Synergistic Effects ◽  
Optical Transmittance ◽  
Mechanical Analysis ◽  
Differential Scanning Calorimetric ◽  
Structure Property ◽  
X Ray Diffraction ◽  
Calorimetric Analysis ◽  
High Optical Transmittance ◽  
Methyl Cyclohexane ◽  
Ft Ir

In order to prepare novel polyimides (PI) with high transparency and solubility in common solvents, three diamine monomers containing pyridine or methyl-substituted pyridine and cyclohexane, 1,1′-bis[4-(5-amino-2-pyridinoxy)phenyl]cyclohexane (IIIa), 1,1′-bis[4-(5-amino-3-methyl-2-pyridinoxy)phenyl]cyclohexane (IIIb), and 1,1′-bis[4-(5-amino-2-methyl-6-pyridinoxy)phenyl]cyclohexane (IIIc), were synthesized and characterized. The diamine monomer (IIIa) was subsequently polymerized with 3,3′,4,4′-oxydiphthalic anhydride, 4,4′-(hexafluoroisopropylidene)-diphthalic anhydride (6FDA) to obtain PIs, PI-1 and PI-2. Furthermore, PI-3 (IIIb/6FDA) and PI-4 (IIIc/6FDA) were prepared for structure–property comparison studies. The structures of the resulting PIs were characterized by fourier transform infrared spectroscopy (FT-IR), X-ray diffraction, and elemental analysis. The physical properties of the PI films were investigated by thermogravimetric analysis, differential scanning calorimetric analysis, dynamic mechanical analysis, and ultraviolet–visible spectroscopy. In general, the PIs showed excellent thermal properties and good mechanical properties. Most had good solubility in polar organic solvents such as N, N-dimethylacetamide, N, N-dimethylformamide, N-methylpyrrolidone (NMP), m-cresol, and even soluble in low boiling solvents such as tetrahydrofuran (THF) and CHCl3. The PI films also exhibited high optical transmittance of 94–97% at 500 nm and cut-off wavelength at 345–359 nm. In summary, the introduction of methyl, cyclohexane, and pyridine groups into the backbone was shown to improve the solubility and transparency of PI films.

scholarly journals Theoretical Verification of Dielectric and Magnetic Properties of Polyaniline-Nickel Ferrite Nanocomposites Synthesized in Green Medium Extracted from the Fruit of Tamarindus indica

2020 ◽  
Vol 32 (3) ◽  
pp. 646-652
Author(s):  
T.R. Smitha ◽  
Thushara Bhadran ◽  
Vaishali Shanker ◽  
K.H. Prema
Keyword(s):  
Magnetic Properties ◽  
Nickel Ferrite ◽  
Oxidative Polymerization ◽  
Tamarindus Indica ◽  
X Ray Diffraction ◽  
Electrical And Magnetic Properties ◽  
External Frequency ◽  
Ft Ir ◽  
Experimental Values ◽  
Ferrite Composites

Nanocomposite materials of nickel ferrite incorporated polyaniline (PANI) have been synthesized via in situ oxidative polymerization technique in a green medium extracted from the fruit of plant Tamarindus indica. Synthesized particles were characterized by FT-IR spectroscopy, X-ray diffraction technique and scanning electron microscopy. Various samples of composites were prepared with 5, 10 and 15 g of filler nickel ferrite and the variation in dielectric permittivity is calculated by measuring the capacitance of the materials in various external frequency ranges from 100 Hz to 20 MHz. Experimental values of dielectric property are compared with theoretical values obtained from Maxwell-Wagner equation. The magnetic properties such as saturation magnetization (Ms), magnetic remanance (Mr) and coercivity (Hc) of the samples were analyzed by vibrating sample magnetometer (VSM). Retention of the magnetic filler in the PANI matrix is evaluated by comparing the experimental Ms values of the composites with the values computed from a theoretical linear equation. The experimental results were well fitted with the theoretical values and confirmed the synthesis of PANI-nickel ferrite composites with desired electrical and magnetic properties by varying the amount of components.

Effects of Reaction Conditions on Microstructures and Properties of Polyaniline Nanofibers through Interfacial Polymerization

2013 ◽  
Vol 750-752 ◽  
pp. 293-296
Author(s):  
Fei Tian ◽  
Zong Yi Qin ◽  
Qian Wu ◽  
Na Liu ◽  
Ya Qing Lu
Keyword(s):  
Interfacial Polymerization ◽  
Oxidative Polymerization ◽  
X Ray Diffraction ◽  
Chemical Oxidative Polymerization ◽  
Reaction Conditions ◽  
X Ray ◽  
Polyaniline Nanofibers ◽  
Solvent Water ◽  
Pani Nanofibers ◽  
Ft Ir

Polyaniline (PANI) nanofibers were fabricated through chemical oxidative polymerization at various organic solvent/water interfaces. The products were characterized by scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). It is found that the morphologies, microstructures and properties of PANI nanofibers depend not only on the nature of organic solvents but also the adding way of aniline monomers and oxidant.

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