Preparation and characterization of polyaniline with high electrical conductivity

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1、ResearchArticleReceived:5August2008,Revised:7October2008,Accepted:17October2008,PublishedonlineinWileyInterScience:26November2008(www.interscience.wiley.com)DOI:10.1002/pat.1333PreparationandcharacterizationofpolyanilinewithhighelectricalconductivityKeqingZhangaandXinliJing

2、a*Inthepresentpaper,polyaniline(PANI)waspolymerizedbyammoniumpersulphateusingachemicallyoxidativeprocessundermildtemperturesrangingfromS520-C.ElectricalconductivityofassynthesizedPANIgotenhancedgraduallyowingtotheincreaseinmolecularweightandcrystallinitywithdecreaseinsynthe

3、sistemperature.Extractionwithtetrahydrofuran(THF)wasemployedasthepurificationmethodofemeraldinebase(EB)toenhancetheelectricalconductivityofPANIeffectivelyattributedtotheremovalofthelowmolecularweightfractionsanddefectivemolecularchains.Methanesulfonicacid(MSA)wasusedtodopeEB

4、duetoitsstrongacidityandsmallmolecularsize,andtheamountofdopantversusEBwasalsooptimized.Usinganovelsynergisticdopingprocesswithm-cresol,electricalconductivityofPANIisfurtherenhancedowingtomoreregularmolecularchainswhichresultedinbetterinterchainchargecarriersconduction.Thee

5、meraldinesaltsobtainedfinallyhavehighelectricalS1conductivityreachingupto32.5Scm,whichismuchhigherthanthatoftheconventionallysynthesizedsamplereportedpreviously.Copyrightß2008JohnWiley&Sons,Ltd.Keywords:polyaniline;conductivity;doping;m-cresol[11][12]INTRODUCTIONdopingwithm-

6、cresolandstretching,isthefavorableapproachtoprepareaPANIfilms.PANIfilmspreparedbythetwoAsoneofthemostpromisingelectricallyconductingpolymers,methodsmentionedabovehavemoreexpandedmolecularpolyaniline(PANI)hasbeencontinuingtoreceiveparticularchainsandinevitablyhavehigherelectri

7、calconductivity.attentionoverthepast30yearsbecauseofitsrelativelyfacileExtensivestudieshavebeenreportedintheliteraturesynthesis,environmentalstabilityanduniqueredoxproperties.regardingthesynthesisofPANIfilmswithhighelectricalHighelectricalconductivityanddesirableelectrical,e

8、lectro-conductivity,butworksreportingtheenhancementofelectricalchemicalandopticalp