Tariq J. Alwan

Tariq J. Alwan
Al-Mustansiriya University · Department of Physics

Professor

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34
Publications
8,185
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246
Citations

Publications

Publications (34)
Article
Full-text available
Polyaniline (PANI) and PANI/f-SWCNT thin films have been synthesized by a chemical oxidative polymerization method. Ammonium persulfate (NH4)2S2O8 and hydrochloric acid (HCL) were used as an oxidizing agent and protonic acid dopant respectively. The results of XRD pattern showed that the neat PANI and PANI/f-SWCNT thin films have an amorphous struc...
Article
Full-text available
The Polyaniline/functionalization multiwall carbon nanotubes (PANI/f-MWCNT) thin films have been prepared successfully by the dip coating of slide glass during in-situ polymerization of PANI/f-MWCNT. The PANI/f-MWCNT thin films of thickness (200±20) nm have been prepared at different doped ratios of f-MWCNTs (0.34, 0.5, 1 W%). The films are charact...
Article
Full-text available
In this work PANI/MgO nanocomposite thin films were prepared by situ oxidative polymerisation method under different hydrochloric acid (HCl) molarity. The PANI/MgO nanocomposite thin films were characterized by X-ray diffraction, field emission scanning electron microscope (FESEM) and Fourier transform infrared spectroscopy to study the effect of H...
Article
Full-text available
Polyaniline (PANI) and PANI/f-MWCNT thin films have been synthesized by the in-situ chemical polymerization method. Ammonium persulfate (NH4)2S2O8 and hydrochloric acid (HCL) were used as an oxidizing agent and protonic acid dopant respectively. The f-MWCNT was added to PANI matrix to enhance and modify its optical properties. The films were deposi...
Article
In this research, anti-reflection coatings consisting of single and double layers were designed in the IR (8 – 14μm) region to reduce the unwanted reflections of germanium (Ge) substrate. The reflectance of Ge substrate was about 36% per surface. These values were reduced reasonably by using single and double layer anti-reflection. The used layers...
Article
Full-text available
Pure and Lead-doped poly vinyl alcohol (Pb-PVA) films were prepared by volume mixture using casting technique by different concentrations (2% and 6%). The characteristics of composites was investigated by FTIR spectroscopy. The optical properties, absorption and transmission of films were investigated through the transmission measurements at room t...
Article
Full-text available
The solid-state reaction was used to prepare three different high-temperature superconductors, namely Tl0.85Cd0.15Sr2CuO5−δ, Tl0.85Cd0.15Sr2Ca2Cu2O7−δ and Tl0.85Cd0.15Sr2Ca2Cu3O9−δ. The optimum calcinations were performed at 800∘C, and the sintering was performed within 855–860∘C. The samples were tested before and after oxygen treatment. It has be...
Article
In this work, we study the structure, electronic properties and electronic spectra of Coumarin 102 (C102) dissolved in ethanol as an experimental-theoretical investigation. The various properties of the ground and excited electronic states of coumarins 102 using density functional theory (DFT) and time-dependent density functional theory (TDDFT) wa...
Article
Full-text available
In this work, we study the structure, electronic properties and electronic spectra of Coumarin 102 (C102) dissolved in ethanol as an experimental-theoretical investigation. The various properties of the ground and excited electronic states of coumarins 102 using density functional theory (DFT) and time-dependent density functional theory (TDDFT) wa...
Article
Full-text available
Organic/inorganic hetero junction solar cells were fabricated by deposition of PAni.CSA/PEO nano fibers on TiO2 n-type layer by using electrospinning technique. The currentvoltage (I-V) measurements of the device under dark conditions exhibit asymmetrical and rectifying behavior for ITO/TiO2/PAni.CSA.PEO/Al junction that confirms the formation of d...
Article
Bismuth-antimony based superconductors with the formula Bi2-x SbxSr2Ca2Cu3O10+δ (x=0, 0.2 and 0.4) have been prepared by use three step solid state reaction processes, the four probe techniques was used to find electrical resistivity and the transition temperature Tc, and have showed the samples Bi2-xSr2Ca2Cu3O10.21, Bi1.8Sb0.2Sr2Ca2Cu3O10.28 and B...
Article
Full-text available
Citation: Alwan TJ, Toma ZA, Kudhier MA, Ziadan KM. Preparation and characterization of the PVA nanofibers produced by electrospinning. Abstract Electrospinning is a simple and quick technique for producing fibers with nanoscale diameters from a wide range of materials. The Polyvinylalcohol PVA Polymer dissolved in the DMF was electrospun to obtain...
Article
Full-text available
The various properties of the ground and excited electronic states of coumarins 102 using density functional theory (DFT) and time-dependent density functional theory (TDDFT) was calculated by the B3LYP density functional model with 6-31G(d,p) basis set by Gaussian 09 W program. Spectral characteristics of coumarin102 have been probed into by metho...
Article
Full-text available
The PMMA and PMMA doped with Cr2O3 films with different concentration (1%, 3%,5%), were prepared using the casting technique in order to study the effect of doping in the optical properties of this films. The optical properties of the films were examined by UVVIS spectrophotometer in wavelengths ranging 250 - 900 nm. The optical transmittance and a...
Article
Full-text available
Alignment nanofibers of PAni.CSA/PEO blends with different concentration of polyethylene oxide (PEO) have been prepared using the electrospinning technique. The details of the preparation method are well described. The method is relatively simple and is easily controlled. A systematic investigation on the effect of annealing temperature on the stru...
Article
Full-text available
In this work, we have studied the effect of the gamma irradiation on the optical properties and optical constants of Polystyrene doped by methylene blue (mb) with thickness in the range 0.11 + 5 mm. The samples have been investigated via transmittance and reflectance spectra, and characterized in the wavelength range 300-900 nm. The optical band ga...
Article
Full-text available
This paper presents the results of the outdoor performance tests for several types of commercial photovoltaic panels. These were both single crystal and multicrystalline silicon (Si) panels as well as thin-film crystalline (CIS) and two amorphous Si devices-single junction, marked as TJ, respectively. The effects of air mass and thus solar time on...
Article
In this work, we present a systematic study on the effect of sintering time on the superconducting behavior of the Hg0.6Pb0.25Sb0.15Ba2Ca2Cu3O8+δ compound. Bulk polycrystalline samples have been prepared by a solid state reaction method. It has been observed that the as grown Hg0.6Pb0.25Sb0.15Ba2Ca2Cu3O8+δ compound corresponds to the 1223 phase. El...
Article
Full-text available
In this work, we present a systematic study on the effect of sintering time on the superconducting behavior of the Hg 0.6 Pb 0.25 Sb 0.15 Ba 2 Ca 2 Cu 3 O 8+δ compound. Bulk polycrystalline samples have been prepared by a solid state reaction method. It has been observed that the as grown Hg 0.6 Pb 0.25 Sb 0.15 Ba 2 Ca 2 Cu 3 O 8+δ compound corresp...
Article
200-900nm ‫تحضيرها‬ ‫تم‬ ‫ألفالم‬ ‫من‬ ‫مختمفة‬ ‫نيه‬ ‫وز‬ ‫بنسب‬ Ps ‫و‬ Ps-Ni(etx) 2 ، ‫فجوة‬ ‫إن‬ ‫الطاقة(‬ E opt ‫ومعامل‬ ‫االنكسار‬ ‫ومعامل‬) ‫حسابها‬ ‫تم‬ ‫الخيالي‬ ‫و‬ ‫الحقيقي‬ ‫العزل‬ ‫وثابت‬ ‫الخمود‬ ‫من‬ ‫التشويب‬ ‫نسبة‬ ‫تأثير‬ ‫ومناقشة‬ Ni(etx) 2 ‫إلى‬ Ps ‫ا‬ ‫من‬ ‫حسابها‬ ‫تم‬ ‫الطاقة‬ ‫فجوة‬ ‫قيم‬ ‫أن‬ ‫حيث‬ ‫فضاء‬ ‫في‬ ‫المسموح‬ ‫الم...
Article
Full-text available
CuAlS2 thin films of thicknesses 118 ± 5 nm were deposited on glass substrates using chemical bath deposition technique. The details of the preparation method are well described. The method is relatively simple and is easily controlled and sufficient to produce large area and good adherence to the substrate films. Effect of annealing temperature Ta...
Article
Full-text available
High temperature superconductors, namely Tl0.6⋅ Pb0.4Ba2−x Sr x Ca2Cu3O9−δ , have successfully been prepared by the solid state reaction method. The substitutions for this compound were taken as x=0.0, 0.10, 0.20, 0.30, 0.40 and 0.50. The optimum calcination was at 1073K and for sintering was within 1128–1133K. Electrical resistivity, using the fou...
Article
Full-text available
A polycrystalline CdSe thin films doped with (5wt%) of Cu was fabricated using vacuum evaporation technique in the substrate temperature range(Ts=RT- 250) oC on glass substrates of the thickness(0.8μm). The structure of these films are determined by X-ray diffraction (XRD). The X-ray diffraction studies shows that the structure is polycrystallin...
Article
Full-text available
In this work three sets of superconducting samples with composition Tl 0.8Sb0.2Sr2Ca2Cu30 9-δ prepared by the solid state reaction techniques. The appropriate amount of Tl2O3, Sb2O3, SrCO3, CaCO3 and CuO of 99.99 % purity were used as starting raw material and were mixed. The mixed powder was initially calcinated at constant temperature of 800C° an...
Article
Full-text available
The electrical properties of polycrystalline cadmium telluride thin films of different thickness (200,300,400)nm deposited by thermal evaporation onto glass substrates at room temperature and treated at different annealing temperature (373, 423, 473) K are reported. Conductivity measurements have been showed that the conductivity increases from...
Article
Full-text available
Lead Chalcoganides thin films ( PbTe , PbSe, PbS) have been prepared by thermal evaporation method ,with 0.35 m thickness , This thin films that deposited on glass and wafer (Si) substrate at room temperature (303oK) , this films was annealed to temperatures ( Ta= 373o K ,473o K) for one hour. X-Ray diffraction technique ware used to study the str...

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