简介:Polyanilinefilmwaspreparedbyelectrochemicalmethodinanacidicsolutionofaniline.Themicromorphologyofthepolyanilinefilmwastransformedtothree-dimensionalnetworkstructureinsteadoflittleparticleswhilethedepositiontimewasextended.Thepeakwavelengthofthephotoluminescencespectrumwas491nm.Theluminousintensityincreasedwiththeextensionofdepositiontime,andsodidtheelectrochemicalactivity.
简介:Afreestandingfilmofpolyanilineaslargeas18cm×18cm×0.002cmcanbeobtainedbyevaporationofasolutionofthechemicallysynthesizedbaseinNMP.Itsstructurewasexaminedbytheelementalanalysis,IR,U.V.-visiblespectra,XPS,DSC,SEMandX-rayscatteringanditsconductingbehavioraswellaselectrochemicalpropertieswerestudied.Resultsshowthatthecomposition,structureofmainchain,physicalpropertiesofthefreestandingfilmofpolyanilmeissimilartothatofthepowder.However,somedifferencesinitselectronicstructure,conductivityatroomtemperatureandpotentialofredoxcouplebetweenthefleestandingfilmandpowderareobserved,whichmaybeduetocross-linkingofthefilmofpolyaniline.
简介:Thephotoelectrochemicalbehaviorofpolyaniline(PAn)filmwasstudiedinaqueouselectrolytesolutioncontainingFe(CN)63-/Fe(CN)+4-redoxcouple.ItwasfoundthatPAnfilmspossessthepropertiesofp-typesemiconducterandacathodicphotocurrentashighas700μA/cm2wasobservedwhenirradiatedunderpolychromaticlightof100mW/cm2.
简介:Watersolubleconductingpolyanilinewithelectricalconductivityof10-1-10-2S/cmwaspreparedemployingdopantinducedwatersolubilitytechnology.Thewaterresistanceoftheconductingfilmwassignificantlyimprovedemployingsol-gelhybridsmethod,especiallywhentheconductivepolyanilineloadingwasbelow30wt%.Thereasonfortheimprovementisthattheconductingpolyanilinechainsareconfinedinastableinorganicnetwork.
简介:Photoelectricpropertyofpolyanilinedopedwithdodecyl-benzeneincreasesobviously,whenpolyanilinedopedwithDBSAisirradiatedwithlight,Mixtureofsensitivematerialisadvantageoustotheabsorptionofpolyanilineinvisiblelightspectrum,andtheconductivityisalsoimproved.TheresultsofdielectricmeasurementsonpolyanilinedopedwithDBSAinanAl-PAn-DBSA-Alconfigurationasfunctionoffrequencyandtemperaturearereported.Thespace-chargepolarizationphenomenonisobserved.Carrierlifetimeismicrosecondmagnitudeandmobilityis(0.001-0.1)cm^2/V·s,whichareobtainedbycalculationorexperiment.Theactiveenergyisobtainedfromtherelationbetweenconductivityandtemperature.TheconductingmechanismofPAn-DBSAisanalyzed.
简介:Tosensitizepolyanilinewithdyesbyelectrochemicalpolymerization,HClO4isemployedasthedopantandoxidant,andthepolyanilinewithdiffernetsensitivepropertiesissynthesized.Theeffectofsensitizedemeraldinesaltontheabsorptionspectrumisdiscussedindetails.Themaximumconductivityofsensitizedfilmsreaches1.22S/cm,andinvestigationondyesensitizingofthepolymerrevealsthatC.I.DirectBlue71,C.I.DirectBlue84,C.I.DirectBlack19andCuPc-(COOH)4mayenhancethephotoconductivityofpolyanilinegreatly.
简介:Dopedpolyanilinefilmswerepreparedwithelectrochemistrymethod.Asmallconjugatedmolecule,anthracenecarboxylicacid(2-ACA),wasusedasthedopant,consideringitselectricalactivenessduetotheconjugatedπ-π*structure.Filmmorphologyofdopedandundopedpolyanilinesampleswasinvestigated.ThecorrespondingchangesinopticalandelectricalpropertiesafterACAdopingwerediscussed.Bymeasuringandcalculatingtheirenergyleveldistribution,apromisingapplicationofpolyanilinethinfilmsasbufferlayerinoptic-electricdevicesisexpectable.
简介:ByuseoftheKeldyshnn-equilibriumGreen's-functionmethods,thethirdharmonicsusceptibilitiesoftwopolyanilinefamilies,PANI-HCl巨PANI-H3PO4,arccalculated[x^(3)(ω)≈10^-12esu].Itwasfoundthatthethirdharmonicsusceptibilityofpolyanilinestronglydependsonthedelocalizationoftheelectrons.Therefractiveindicesn(λ=589nm)ofPANI-HClandPANI-H3PO4arecalculatedbyuseofthreecommonmethods(theLorentz-Lorentztheoreticalmodel,theGladstone-DalegroupcontributionandtheVogelgroupcorrelation)basedongroupcontributionstomolarrefraction.Thecalculatenvaluesarevariedfrom1.31to1.42forPANI-HCland1.36to1.45forPANI-H3PO4.
简介:Asimpleroutetosynthesizethepolyaniline(PANI)nanofiberswithdiameterabout150nmwasreported.Inthisstrategy,thePANInanofiberswerefabricatedbyelectrochemicaldepositionbyusingtwo-electrodeconfigurationin0.01Manilineand0.01MH2SO4electrolytes.Theas-preparedmaterialswerecharacterizedbyscanningelectronmicroscopy(SEM),infraredspectroscopy(FTIR),Ramanspectroscopyandthermogravimetricanalysis(TGA).TheelectrochemicalpropertiesofthePANInanofiberselectrodeassupercapacitormaterialswereinvestigated.ThePANInanofiberselectrodeshowedhighcapacitanceof485F·g-1at0.1A·g-1,andthedecreaseinthespecificcapacitanceisabout3.5%in1000cycles.TheresultsindicatethatthePANInanofiberselectrodeshowshighstabilityandretainsitselectrochemicalcapacitancepropertyover1000cycles,suggestingPANInanofibershavepromisingapplicationsinhigh-performancesupercapacitors.
简介:Electroactiveconductingcopolymersofaniline(ANI)anddiphenylamine(DPA)arepreparedonindiumtinoxide(ITO)surfacefrom1mol/LH2SO4aqueoussolutionwithdifferentfeedratiosofANItoDPAbyusingapotentiostaticmethod.FTIRspectraandSEMmeasurementsareusedtoconfirmtheformationofcopolymers.DuetothecombinationoftheN,N′-diphenylbenzidineandanilineunitsinthemolecularchain,thecopolymerfilmsexhibitimprovedelectrochemicalandelectrochromicproperties,comparedtoPANIandPDPA.Thecopolymer[markedasP(ANI9-co-DPA1)]filmpreparedataratioof9:1(ANI/DPA)exhibitsnoveltransmittancemodulationbothinvisibleandnear-infrared(NIR)regionbetween-0.8Vand0.8V(52%and67%respectively)andfastresponsetime(3.6sforcolorationand2.3sforbleachingat600nm).Anelectrochromicdevice(ECD)basedonP(ANI9-co-DPA1)andPEDOT:PSSisalsofabricatedandshowsamulticolorelectrochromicperformance,withagoodopticalcontrast(29%invisibleregionand40%inNIRregion),acceptableresponsetime(8.3sforcolorationand7.5sforbleachingat600nm)andlong-termstability.Clearcolorchangesfromtransparent(-0.8V),brightgreen(0V),seagreen(0.4V)todarkslategray(0.8V)aredemonstrated.
简介:ElectrochemicalBettednotonlycanobtaintheconductingfilmofpolyanilineonaglasscarbonelectrode,butalsocanimobilizePMo12O403-inthefilmtoformaorganicconductingfilmelectrodemodifiedbyheteropolyanion.ThepaperherereportselectrochemicalchangesinthepreparationofPMo12O403--polyanilinemodifiedelectrode,theelectrochemicalreactionmechanismofthemodifiedelectrodewasobtainedfromthestudyonitsredoxproperties.Moreover,theaboveelectrodeshowedmarkedelectrocatalysisforthereductionreactionofCIO?-.
简介:Ionimplantationmayfavorablymodifythepropertiesofpolyaniline/Siheterojunctionsolarcellsfabricatedbytheelectrochemicalmethod.Influencesoftheimplantationontheabsorptionspectrumandthethermalstabilitywerediscussedandoutputpropertiesweremeasured.Theresultsshowthattheabsorptionspectrumofthepolyanilinefilmsmodifiedbyionimplantationismuchwider;itspyrolytictemperatureincreasesby40℃,andthepolyaniline/Sicellefficiencyincreases18and3timesundertheilluminationof10.92and37.2W/m2,respectively.
简介:Flyashfloatingbead(FAFB)wasmodifiedbythenonionicsurfactantpolyethyleneglycol(PEG)undervariousconcentrationstoimproveitshydrophobility,andthenPEGmodifiedFAFBcompositedwithpolyaniline(FAFB-PEG/PAn)byemulsionpolymerizationmethodusingdifferentfeedratiosofFAFBPEG.Thechemicalstructure,phasestructure,microstructure,conductivity,anddielectricpropertieswerestudiedbyFT-IR,XRD,SEM,four-probetechnique,andLCRdigitalbridge,respectively.ItwasdemonstratedthattheoptimalconcentrationofPEGwas1mol/Landthecorrespondinggraftingratiowas1.42%.ThephasestructureofFAFBwasnotdestroyedaftermodificationbyPEG,whilethesurfacebecamesmootherandcouldbecoatedbyPAnsuccessfullyaccordingtoSEMtechnique.ComparedtothatofdodecylbenzenesulfonicaciddopedPAn(PAn-DBSA),theconductivityofFAFB-PEG/PAnwasdecreasedby10-100timesafterintroductionofvariousamountsofFAFB-PEG,especiallythevaluecouldbedecreasedto0.01Scm~(-1)if50wt%ofFAFBPEGwasprovided.Additionally,thedielectricconstantandlossfactorofFAFB-PEG/PAncompositesgraduallydecreasedwithincreasingamountofFAFB-PEGinthefrequencyrangeof100KHz-2MHz,namely,thedielectricconstantcouldbestillkeptat500andcorrespondinglythelossfactordecreasedto4.7at100KHzif50wt%ofFAFB-PEGwasprovided.TheleakingcurrentphenomenonderivedfromPAn-DBSAcouldalsobeweakenedbyFAFB-PEG.
简介:EffectofaddedCo2+(aq)oncopperelectrowinningwasstudiedusingdopedpolyaniline(Pani)andPb-Ag(1%)anodesandastainlesssteelcathode.ThepresenceofaddedCo2+(aq)intheelectrolytesolutionwasfoundtodecreasetheanodepotentials.TheoptimumlevelofCo2+(aq)concentrationintheelectrolyte,withrespecttothemaximumsavingofpowerconsumptionwasestablished.Linearsweepvoltammetry(LSV)wasusedtostudytheinfluenceofaddedCo2+(aq)ontheanodicprocessesinacoppersulfate-sulfuricacidelectrolyte.Theoxygen-evolutionpotentialforPanianodeisdepolarisedatlowercurrentdensities(≤0.01A/cm2)andattainssaturationatρ(Co2+)o≈0.789g/L;whilsttheoxygen-evolutionpotentialforPb-Ag(1%)anodeisdepolarisedathighercurrentdensities(≤0.02A/cm2)andattainssaturationatρ(Co2+)o≈1.315g/L.Thepreferredorientationsofthecopperdepositschangefrom(220)to(111)withtheadditionof0.394?0.789g/LCo2+buthigherconcentrationsfavor(220)orientationagain.