石墨烯-半導(dǎo)體復(fù)合型光催化材料制備、性能及機(jī)理研究

石墨烯—半導(dǎo)體復(fù)合型光催化材料制備、性能及機(jī)理研究摘要：本論文總結(jié)了近年來(lái)石墨烯與半導(dǎo)體復(fù)合型光催化材料在制備、性能和機(jī)理等方面的研究進(jìn)展。首先介紹了石墨烯的基本性質(zhì)和制備方法，然后探討了半導(dǎo)體與石墨烯的復(fù)合機(jī)制及其對(duì)光催化性能的影響。進(jìn)一步討論了光催化反應(yīng)機(jī)制，包括電荷轉(zhuǎn)移、表面活性位點(diǎn)、光響應(yīng)過(guò)程等方面，并對(duì)光吸收、光電流和催化反應(yīng)等性能進(jìn)行了詳細(xì)的實(shí)驗(yàn)研究。最后，論文對(duì)石墨烯與半導(dǎo)體復(fù)合型光催化材料的進(jìn)一步發(fā)展方向進(jìn)行了展望。

關(guān)鍵詞：石墨烯、半導(dǎo)體、光催化、復(fù)合材料、機(jī)理研究

Abstract:Thisarticlesummarizestheresearchprogressofgraphene-semiconductorcompositephotocatalyticmaterialsintheaspectsofpreparation,properties,andmechanisminrecentyears.Firstly,thebasicpropertiesandpreparationmethodsofgrapheneareintroduced.Then,thecompositemechanismbetweensemiconductorsandgrapheneanditseffectonphotocatalyticperformancearediscussed.Furthermore,thephotocatalyticreactionmechanismisdiscussed,includingchargetransfer,surfaceactivesites,photoresponsiveprocesses,etc.,anddetailedexperimentalresearchiscarriedoutonpropertiessuchasphotoabsorption,photocurrent,andcatalyticreaction.Finally,thearticlelooksforwardtothefurtherdevelopmentofgraphene-semiconductorcompositephotocatalyticmaterials.

Keywords:graphene,semiconductors,photocatalysis,compositematerials,mechanismresearchPhotocatalysisisapromisingtechnologythathasgainedsignificantattentionduetoitspotentialinsolvingenvironmentalandenergy-relatedproblems.Graphene-semiconductorcompositephotocatalyticmaterialshaveshownexcellentphotocatalyticactivitiescomparedtoindividualsemiconductors.Thestronginteractionbetweengrapheneandsemiconductorsenhancestheseparationandtransferofphotogeneratedcarriers,significantlyimprovingtheirphotocatalyticperformances.

Thephotocatalyticreactionmechanismofgraphene-semiconductorcompositesinvolvesseveralprocessessuchaschargetransfer,surfaceactivesites,andphotoresponsiveprocesses.Whenaphotonisabsorbedbythesemiconductor,anelectron-holepairisgenerated,whichcanmigratetothegraphenesurfaceduetothelargesurfaceareaofgraphene.Meanwhile,theelectronfromgrapheneistransferredtothesemiconductor,enhancingtheseparationofphotogeneratedcarriers,andsuppressingrecombination.Thesurfaceactivesitesofcompositesplayacriticalroleinadsorbingreactantsandfacilitatingphotocatalyticreactions.Photoresponsiveprocessessuchasmultipleexcitongenerationandhot-electrontransferhavealsobeenexploredtoimprovetheiroverallphotocatalyticefficiency.

Experimentalresearchhasbeencarriedouttoinvestigatethepropertiesofgraphene-semiconductorcompositephotocatalyticmaterials,includingphotoabsorption,photocurrent,andcatalyticreaction.Photoabsorptionresultsshowedthatthecompositesexhibitenhancedabsorptioninthevisibleregioncomparedtoindividualsemiconductors.Photocurrentmeasurementsindicatedahigherchargeseparationefficiencyinthecompositesystem.Thecatalyticactivityofthecompositeswasevaluatedbyinvestigatingthedegradationoforganicpollutantsunderlightirradiation.Theresultsshowedthatthegraphene-semiconductorcompositecatalystsexhibitedsignificantlyhigherphotocatalyticactivitythanindividualsemiconductors.

Inconclusion,thedevelopmentofgraphene-semiconductorcompositephotocatalyticmaterialshasshownpromisingphotocatalyticperformanceduetothesynergisticeffectbetweengrapheneandsemiconductors.Thephotocatalyticreactionmechanismandpropertieshavebeeninvestigatedindetail,andexperimentalstudieshaveshownencouragingresults.Furtherstudiesareneededtoexplorethepotentialofgraphene-semiconductorcompositesinthefieldofphotocatalysisFuturestudiesinthedevelopmentofgraphene-semiconductorcompositephotocatalyticmaterialscouldfocusonseveralareas.

Firstly,effortscouldbedirectedtowardsexploringnewgraphene-basedmaterialsthatexhibitbetterphotoconductivityandchargetransferproperties.Forinstance,researcherscouldinvestigatetheuseofgraphenequantumdots,whichhavebeenshowntopossessuniqueoptoelectronicpropertiesthatcouldenhancethephotocatalyticactivityofsemiconductors.

Secondly,researcherscouldexploretheuseofothertypesofsemiconductorsincombinationwithgraphenetodevelopnewphotocatalyticmaterials.Forinstance,metaloxidessuchasTiO2,ZnO,andFe2O3havebeenextensivelystudiedinthefieldofphotocatalysis,andcouldpotentiallybecombinedwithgraphenetodevelopnewcompositematerialswithenhancedphotocatalyticactivity.

Thirdly,researcherscouldinvestigatetheuseofnewsynthesistechniquesforthepreparationofgraphene-semiconductorcompositematerials.Forinstance,advanceddepositionmethodssuchasatomiclayerdepositionandplasma-enhancedchemicalvapordepositioncouldbeutilizedtodepositsemiconductorsontographenesurfacesinacontrolledmanner,whichcouldleadtothedevelopmentofnewcompositematerialswithuniqueproperties.

Finally,researcherscouldexploretheuseofgraphene-semiconductorcompositematerialsinotherareasbeyondphotocatalysis.Forinstance,theuniquepropertiesofgraphenecouldmakeitsuitableforuseinthedevelopmentofsensors,energystoragedevices,andelectronicdevices.Therefore,researchcouldfocusontheuseofgraphene-semiconductorcompositematerialsintheseareastodevelopnewfunctionalmaterialswithenhancedproperties.

Inconclusion,thedevelopmentofgraphene-semiconductorcompositephotocatalyticmaterialsisarapidlygrowingareaofresearchthatholdsgreatpotentialforthedevelopmentofnewmaterialswithenhancedphotocatalyticactivity.Futurestudiescouldfocusontheexplorationofnewgraphene-basedmaterials,theuseofothersemiconductors,thedevelopmentofnewsynthesistechniques,andtheexplorationofotherareasbeyondphotocatalysisFurthermore,itisimportanttoconsiderthescalabilityandcost-effectivenessofthesegraphene-semiconductorcompositematerialsforpracticalapplications.Whiletheperformanceofthesematerialsinlab-scaleexperimentsispromising,theircommercialviabilitywillrequirethedevelopmentofcost-effectiveandscalableproductionmethods.

Additionally,thepotentialtoxicityofgrapheneandsemiconductormaterialsmustbethoroughlyinvestigatedtoensuretheirsafeuseinvariousapplications.Properdisposalandrecyclingmethodsmustalsobedeveloped.

Finally,theapplicationofgraphene-semiconductorcompositematerialsextendsbeyondphotocatalysis.Theyhavepotentialapplicationsinareassuchasenergystorage,sensing,andelectronicdevices.Futureresearchshouldexploretheseareasandidentifynewapplicationsforthesematerials.

Insummary,thedevelopmentofgraphene-semiconductorcompositematerialshasopenedupnewavenuesforenhancingthephotocatalyticactivityofsemiconductors.Thehighsurfaceareaandexcellentelectrontransportpropertiesofgraphenemakeitanidealcandidateforen