ionic conduction in polymer composite

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Autumnal Seminars of the Physics Department, College of Science, University of Sulaimani, by Dr. Omed Gh. Abdullah, at 30/10/2010

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10/30/20101Universityof UniversityofSulaimani SulaimaniCollegeofScience CollegeofSciencePhysicsDepartment PhysicsDepartmentIonicConductionin IonicConductioninPolymers Composite Polymers Composite PolymersComposite PolymersCompositeOmed OmedGh Gh.Abdullah .AbdullahSTUDYTHEEFFECTOFTEMPERATUREANDFREQUENCYONTHEDIELECTRICPROPERTIESOFSOMECOMMERCIALPOLYMERSATHESISSUBMITTEDTOTHECOUNCILOFCOLLEGEOFSCIENCEUNIVERSITYOFSULAIMANISTUDYTHEEFFECTOFTEMPERATUREANDFREQUENCYONTHEDIELECTRICPROPERTIESOFSOMECOMMERCIALPOLYMERSATHESISSUBMITTEDTOTHECOUNCILOFCOLLEGEOFSCIENCEUNIVERSITYOFSULAIMANIINPARTIALFULFILMENTOFREQUIREMENTSFORTHEDEGREEOFMASTEROFSCIENCEINPHYSICSBYSHUJAHALDEENBAKIRAZIZB.Sc.INPHYSICS2003(Sulaimani University)INPARTIALFULFILMENTOFREQUIREMENTSFORTHEDEGREEOFMASTEROFSCIENCEINPHYSICSBYSHUJAHALDEENBAKIRAZIZB.Sc.INPHYSICS2003(Sulaimani University)UNDERSUPERVISIONOF:Prof.Dr.HAMEEDMAJIDAHMEDSeptember Gelawezh2007 2707UNDERSUPERVISIONOF:Prof.Dr.HAMEEDMAJIDAHMEDSeptember Gelawezh2007 270710/30/20102OPTICALANDELECTRICALPROPERTIESOFSEMICONDUCTINGOXIDEGLASSESATHESISSUBMITTEDTOTHECOUNCILOFCOLLEGEOFSCIENCEUNIVERSITYOFSULAIMANIIN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOROPTICALANDELECTRICALPROPERTIESOFSEMICONDUCTINGOXIDEGLASSESATHESISSUBMITTEDTOTHECOUNCILOFCOLLEGEOFSCIENCEUNIVERSITYOFSULAIMANIIN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR INPARTIALFULFILLMENTOFTHEREQUIREMENTSFORTHEDEGREEOFDOCTOROFPHILOSOPHYINPHYSICSBYDANAABDULLATAHIR(M.Sc.)inphysicsSalahaddin University1995INPARTIALFULFILLMENTOFTHEREQUIREMENTSFORTHEDEGREEOFDOCTOROFPHILOSOPHYINPHYSICSBYDANAABDULLATAHIR(M.Sc.)inphysicsSalahaddin University1995UNDERSUPERVISIONOF:MANAFABDHASSANAHMADALANIAssistantProfessorLecturerSeptember September Galawezh Galawezh2007 20072707 2707UNDERSUPERVISIONOF:MANAFABDHASSANAHMADALANIAssistantProfessorLecturerSeptember September Galawezh Galawezh2007 20072707 2707DielectricanalysisofPolystyrene DielectricanalysisofPolystyrenepolymerfilm polymerfilmDanaA.Tahir,OmedGh.Abdullah,andShujaAldeen B.AzizD f Ph i C ll f S i S l i i U i i DepartmentofPhysics,CollegeofScience,Sulaimani UniversityAbstractIn this work an attempt has been made to study the various dielectricparameters of polystyrene film. The dielectric constant , dielectric loss andloss tangent have been determined in the frequency range (1000)KHz atdifferent temperatures. The frequency dependent conductivity was alsomeasured to characterize the polymer. The complex impedance plot (colecole plot) was used to calculate the static dielectric constant , infinitely large cole plot) was used to calculate the static dielectric constant , infinitely largefrequency dielectric constant and relaxation times. Finally the results areanalyzed in terms of different parameters.Keywords: Keywords: polymerfilm,dielectricconstant,dielectricloss,relaxation,activation polymerfilm,dielectricconstant,dielectricloss,relaxation,activationenergy energy10/30/20103OpticalandElectricalPropertiesof OpticalandElectricalPropertiesofPolyvinyl Polyvinylchloride(PVC)films chloride(PVC)filmsOmedGh.Abdullah,DanaA.Tahir,andShujaAldeen B.AzizDepartment of Physics College of Science Sulaimani University DepartmentofPhysics,CollegeofScience,Sulaimani UniversityAbstractThe optical properties of the polyvinylchloride thin films were studied whichinclude their absorbance, transmittance, reflectance spectra, band gap, and refractiveindex, before and after annealing at T=75oC for 24hrs. The films were found to exhibithigh transmittance, low absorbance and low reflectance in the visible, and nearinfrared region up to 1100nm. However, the absorbance of the films was found to behigh in the ultra violet region with peak around 306nm. The dielectric constant,dielectric loss, and ac conductivity of polyvinylchloride were obtained at differentf i d h i l l h h d frequencies and temperatures. The experimental results show that and decreased with increasing frequency, which indicates that the major contribution tothe polarization comes from orientation polarization. The value of increased withincreasing temperature, which is due to great freedom of movement of the dipolemolecular chains at high temperature.Keywords:thinfilm,opticalproperties,electricalproperties,complexpermittivity Keywords:thinfilm,opticalproperties,electricalproperties,complexpermittivity. .Debyebehavior Debyebehavior0.40.45T=25 C0.40.45T=25 C00.050.10.150.20.250.30.35Dielectric lossT=50 CT=75 C00.050.10.150.20.250.30.35Dielectric lossT=50 CT=75 CColeColeplotforPolystyrene atdifferenttemperatures.1.6 1.8 2 2.2 2.4 2.6Dielectric constant1.6 1.8 2 2.2 2.4 2.6Dielectric constant10/30/20104InternationalJournalofMaterialsScienceISSN09734589Volume5,Number4(2010),pp.537545ResearchIndiaPublicationshttp://www.ripublication.com/ijoms.htmPhysicalPropertiesofPureandCopperOxideDopedPolystyrene Films PolystyreneFilmsOmedGh.AbdullahandDanaS.MuhammadDepartmentofPhysics,CollegeofScience,UniversityofSulaimani IraqAbstract AbstractThe UV/VIS optical absorption for difference compositions copper oxide dopedpolystyrene thin films were studied in the wavelength 2001000 nm. It was found thatthe optical absorption is due to direct allowed transitions, and the energy gaps showsnonlinear behavior with copper oxide concentration, optical energy gap showed a nonlinear behavior with copper oxide concentration, optical energy gap showed adecreasing trend with increased dopant concentration up to 10% of the dopant, forfurther increase in dopant concentration this value started increasing again due tosegregation effects. The annealing of the samples at temperature 90oC for 4 hr, causedthe decrease in energy gaps. The studies of the real and imaginary parts of thedielectric constants showed that they are also affected by copper oxide concentration.Keywords:opticalproperties,polymercomposite,doping,complexdielectricconstant.10/30/20105AbsorptionSpectrum AbsorptionSpectrum0.450.5PS PS- -0%CuO 0%CuO00.050.10.150.20.250.30.350.4Absorbance PS PS- -5%CuO 5%CuOPS PS- -10%CuO 10%CuOPS PS- -15%CuO 15%CuOPS PS- -20 20%CuO %CuOOpticalabsorptionforPSwithdifferentCuO content,asafunctionofwavelength.265 285 305 325 345 365Wavelength (nm)OpticalBandGaps OpticalBandGaps0 20.25 4.4900.050.10.150.24.464.474.480 5 10 15 20 25EtEoptOpticalenergygapofdirectallowedtransition,andtaillocalizedstateenergyagainstcopperoxideconcentration,ofpureanddopedpolymerfilmbefore(solidline),andafterannealing(dashedline).0 5 10 15 20 25CuO concentration %10/30/20106EffectofZirconia concentrationonopticalpropertiesofPolystyrenefilmsOmedGh.AbdullahandDlear R.SaberDepartmentofPhysics,CollegeofScience,UniversityofSulaimani IraqAbstract AbstractOptical properties of prepared Polystyrene (PS) films with different filling levels ofZirconia have been investigated in the visible and ultraviolent wavelength regions. Itwas found that the optical absorption is due to directallowed transitions, and theenergy gaps decrease with increasing Zirconia content for all transitions, while thewidth of the tail localized states increase with increasing Zirconia content. The bandgap of all films shows to be decrease after thermal treatment. The optical constantsrefractive index n, extinction coefficient K, have been also calculated. The refractiveindex increased in the composite samples as compared with the pure PS sample p p p p pprepared by the same method.Keywords:polymer,opticalproperties,filler,extinctioncoefficient,annealing.PACS: 78.20.CiRefractiveindex Refractiveindex2 53ex) PS PS20%ZrO 20%ZrO2211.522.5250 350 450 550 650 750 850 950 1050n (Refrective IndePS PS0%ZrO 0%ZrO22PS PS5%ZrO 5%ZrO22PS PS10%ZrO 10%ZrO22PS PS15%ZrO 15%ZrO22RefractiveindexasafunctionofwavelengthforPSfordifferentZirconia content.250 350 450 550 650 750 850 950 1050Wavelength (nm)10/30/20107Refractiveindex Refractiveindex2 53ex) PS PS20%ZrO 20%ZrO22Sincetherefractiveindexofthiscompositewascontrollableb11.522.5250 350 450 550 650 750 850 950 1050n (Refrective IndePS PS0%ZrO 0%ZrO22PS PS5%ZrO 5%ZrO22PS PS10%ZrO 10%ZrO22PS PS15%ZrO 15%ZrO22 itcanbeusedtofabricatewaveguideswiththedesiredrefractiveindexcontrastRefractiveindexasafunctionofwavelengthforPSfordifferentZirconia content.250 350 450 550 650 750 850 950 1050Wavelength (nm)contrastbetweenthecoreandthecladdingOpticalbandGap OpticalbandGap0.30.350.44.464.4800.050.10.150.20.250.34 364.384.44.424.44Et(eV)Eopt(eV)Theopticalgap,andtaillocalizedstateasafunctionofZirconiacontent,before(solidline)andafterannealing(dashedline).0 4.360 5 10 15 20 25ZrO2 %10/30/20108VariationofOpticalBandGapWidthofPVAfilmsDopedwithAluminumIodideOmedGh.AbdullahandSarkawt Abubakr HussenDepartmentofPhysics,CollegeofScience,UniversityofSulaimani IraqAbstract AbstractPolymer composite of polyvinyl alcohol (PVA), Aluminum Iodide have been prepared by solution castmethod for different doping concentrations The absorption of pure and doped films have been method for different doping concentrations. The absorption of pure and doped films have beeninvestigated in the visible and ultraviolent wavelength regions. It was found that the optical absorptionis due to direct and indirect transitions, and the optical energy gaps values shifted to lower energies onAluminum Iodide doping concentration for all transitions, while the band edge width of the tail localizedstates increase with increasing Aluminum Iodide concentration. The band gap of all films shows to bedecrease after thermal treatment. The optical constants refractive index n, extinction coefficient K, thecomplex dielectric constant have been also calculated. The dielectric constant increased in thecomposite samples as compared with the pure PVA sample prepared by the same method.Key words: polymer composite, optical properties, doping, complex dielectric constant.AbsorptionSpectrum AbsorptionSpectrum0 350.40.45a.u.) PVA-0%AlIPVA

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