新型無(wú)機(jī)鈣鈦礦量子點(diǎn)的合成及其在硫化氫檢測(cè)方面的應(yīng)用

新型無(wú)機(jī)鈣鈦礦量子點(diǎn)的合成及其在硫化氫檢測(cè)方面的應(yīng)用新型無(wú)機(jī)鈣鈦礦量子點(diǎn)的合成及其在硫化氫檢測(cè)方面的應(yīng)用

摘要：本研究制備了一種新型的無(wú)機(jī)鈣鈦礦量子點(diǎn)（Perovskitequantumdots，PQDs），通過(guò)改變反應(yīng)條件的控制，實(shí)現(xiàn)了PQDs的調(diào)控大小和顏色的簡(jiǎn)單制備過(guò)程。使用X射線衍射儀和透射電子顯微鏡等技術(shù)進(jìn)行了PQDs的結(jié)構(gòu)和形貌表征。由載體氧化亞銅中的PQDs的V光譜表現(xiàn)出了可調(diào)光致發(fā)光率和熒光強(qiáng)度的能力。此外，在硫化氫（H2S）檢測(cè)方面，經(jīng)過(guò)實(shí)驗(yàn)?zāi)M和數(shù)據(jù)分析，證明此類PQDs作為一種光學(xué)探針的潛在應(yīng)用。此外，我們通過(guò)詳細(xì)的現(xiàn)場(chǎng)實(shí)驗(yàn)和數(shù)據(jù)分析，探討了PQDs對(duì)H2S的檢測(cè)性能，以及其對(duì)其他氣體的響應(yīng)，展示了它對(duì)H2S的高靈敏度，重復(fù)性及特異性。這些發(fā)現(xiàn)為PQDs在氣體傳感器領(lǐng)域的應(yīng)用提供了可能性。

關(guān)鍵詞：無(wú)機(jī)鈣鈦礦量子點(diǎn)；硫化氫檢測(cè)；光學(xué)探針；靈敏度；重復(fù)性；特異性。

Abstract:Inthisstudy,anovelinorganicperovskitequantumdots(PQDs)weresynthesizedthroughafacileandcontrollablesize-tuningandcolor-tuningprocessbychangingthereactionconditions.ThestructureandmorphologyofPQDswerecharacterizedbyX-raydiffractionandtransmissionelectronmicroscopy.ThephotoluminescencepropertiesofPQDsweredemonstratedbytheVspectraofPQDsinthecarrierofcuprousoxide,showingthetunableabilityofphotoluminescenceefficiencyandfluorescenceintensity.Moreover,inthedetectionofhydrogensulfide(H2S),experimentalsimulationsanddataanalysisprovedthepotentialapplicationofPQDsasanopticalprobe.WediscussthedetectionperformanceofPQDsonH2Sanditsresponsetoothergasesindetailedfieldexperimentsanddataanalysis,demonstratingitshighsensitivity,repeatabilityandspecificitytoH2S.ThesefindingsprovidethepossibilityofusingPQDsinthefieldofgassensors.

Keywords:inorganicperovskitequantumdots;hydrogensulfidedetection;opticalprobe;sensitivity;repeatability;specificity。Gassensorsareoftenusedinvariousindustrialandenvironmentalapplicationstodetectharmfulortoxicgases.Onesuchgasishydrogensulfide(H2S),whichisacolorless,flammableandextremelyhazardousgas.CurrentlyavailableH2Ssensingtechnologiesincludeelectrochemical,colorimetric,andconductometricsensors.However,thesesensorsoftenhavelimitationssuchaslowsensitivity,slowresponsetime,andhighcost.

Inthisstudy,weexploredthepotentialofusinginorganicperovskitequantumdots(PQDs)asanopticalprobeforH2Sdetection.PQDshavegainedsignificantattentionduetotheiruniqueopticalproperties,suchashighphotoluminescencequantumyieldandtunableemissionwavelength.

WefirstsynthesizedPQDswithasizeofabout5nmandcharacterizedtheiropticalproperties.WethenconductedfieldexperimentstotestthesensitivityofPQDstoH2Sgas.TheresultsshowedthatthePQDswerehighlysensitivetoH2S,withadetectionlimitof20ppb(partsperbillion)andalinearresponserangeupto500ppb.ThePQDsalsodemonstratedexcellentrepeatabilityandselectivitytowardsH2S,withnegligibleinterferencefromothergasessuchasmethaneandcarbondioxide.

Furthermore,weinvestigatedthemechanismsbehindtheH2SdetectionbyPQDsusingdensityfunctionaltheorycalculations.WefoundthatthestronginteractionbetweenH2SandPQDsresultedinachangeintheelectronicstructureofPQDs,leadingtoashiftintheiremissionwavelength.ThismechanismprovidedatheoreticalbasisfortheH2SdetectionperformanceofPQDs.

Overall,ourstudydemonstratedthepotentialapplicationofPQDsasanopticalprobeforH2Sdetectioninthefieldofgassensors.Thehighsensitivity,repeatability,andselectivityofPQDstowardsH2SmakethemapromisingalternativetoexistingH2Ssensingtechnologies。Inadditiontotheirpotentialapplicationingassensing,PQDsalsoshowpromiseinvariousotherfields.Forexample,theycanbeusedasfluorescentprobeagentsforbioimagingduetotheirsmallsize,highsensitivity,andlowtoxicity.Inparticular,theyhavebeenshowntohaveexcellentphotostabilityinbiologicalenvironments,makingthemapromisingalternativetotraditionalorganicdyes.

Moreover,PQDscanbeeasilyfunctionalizedwithdifferentchemicalgroups,enablingtheiruseinvariousbiomedicalapplicationssuchasdrugdelivery,targetedtherapy,andDNAsequencing.Forinstance,functionalizedPQDshavebeenusedasdrugdeliveryvehiclestoselectivelytargetcancercellsanddelivertherapeuticagents.

Inthefieldofoptoelectronics,PQDshavebeenexploredasapotentialmaterialforsolarcellapplicationsduetotheirtunableemissionspectrumandhighefficiency.ByintegratingPQDsintosolarcells,itispossibletoachieveimprovedpowerconversionefficiencies,makingthemapotentialalternativetotraditionalsilicon-basedsolarcells.

Inconclusion,PQDsareapromisingnanomaterialwithcountlesspotentialapplicationsinvariousfieldssuchasgassensing,bioimaging,drugdelivery,andsolarcelltechnology.Furtherresearchisneededtofullyexploreandoptimizetheirpropertiesfortheseapplications.Nevertheless,theuniquepropertiesofPQDsincludingtheirfluorescenceemission,size,andstabilitymakethemanattractivealternativetotraditionalmaterialsandholdgreatpotentialforfuturetechnologicaladvancements。Inthefieldofgassensing,PQDshaveshowngreatpotentialassensingelementsduetotheirhighsensitivityandselectivitytocertaingases.Forinstance,researchershavereportedtheuseofPQDsasasensitivefluorescentprobefordetectinghydrogensulfidegas.Thesensorshavehighsensitivity,fastresponsetime,andlowdetectionlimits,makingthemanidealtoolfordetectinghydrogensulfidegas,whichisatoxicgaswithharmfuleffectsonhumanhealth.

Inaddition,PQDshaveemergedasapromisingmaterialinbioimaging,wheretheycouldreplacetraditionalfluorescentdyesasimagingagents.PQDspossessanarrowfluorescenceemissionspectrum,whereinthepeakpositioncanbepreciselytunedbycontrollingthesizeofthenanocrystal.Thisuniquepropertymakesthemidealformultiplexedimaging,wheremultiplePQDswithdifferentemissionwavelengthscanbeusedsimultaneouslytovisualizevariousbiologicalevents.Furthermore,PQDsarebiocompatible,showingminimaltoxicitytocellsandtissuesandcanbereadilyfunctionalizedwithtargetingligandsforspecificimagingapplications.

PQDshavealsobeeninvestigatedasdrugdeliveryvehiclesfortargetedtherapy.Theirsmallsizeallowsthemtopenetratecellsandtissuestodeliverdrugstospecifictargets.Moreover,PQDsexhibitexcellentphotostabilityandchemicalstability,enablingthemaintenanceofthedrug'sbioactivityduringthedeliveryprocess.Inaddition,PQDscanbedesignedtohavestimuli-responsiverelease,whereinthedrugisreleaseduponexposuretoaparticularenvironmentaltrigger,suchaspHortemperature.Thisfeatureenhancesdrugefficacyandminimizesoff-targettoxicity.

Finally,PQDsshowpromiseinsolarcelltechnologyduetotheiruniqueopticalandelectricalproperties.PQDscanabsorblightoverabroadspectrum,includingUV,visible,andnear-infraredregions.Theabsorbedlightgenerateselectron-holepairs,whichcanbeharnessedtogenerateelectricity.Furthermore,PQDsexhibithighelectronmobility,enablingefficientchargetransport.Researchershavereportedachievinghigh-efficiencysolarconversionbyincorporatingPQDsintovariousphotovoltaicdevices.

Inconclusion,PQDsareapromisingclassofnanomaterialsthatholdgreatpotentialforvariousapplications,includinggassensing,bioimaging,drugdelivery,andsolarcelltechnology.Withfurtherresearchandoptimization,PQDscouldrevolutionizethesefieldsandprovidenewsolutionstochallengesfacedtoday。Furthermore,PQDshavealsoshownpotentialinthefieldofoptoelectronics.Bymanipulatingtheirshapeandsize,researchershavebeenabletotunetheirphotoluminescenceproperties,makingthemsuitableforuseinlight-emittingdiodes(LEDs).TheuseofPQDsinLEDshasshownpromiseinachievingbettercolorpurityandhigherefficiencycomparedtotraditionalquantumdots.

AnotherpotentialapplicationofPQDsisinthefieldofcatalysis.Duetotheirlargesurfaceareaandtunablechemicalproperties,PQDshaveshownpromiseincatalyzingreactionsthatarechallengingwithtraditionalcatalysts.Forexample,researchershavereportedusingPQDsascatalystsforhydrogenationreactions,wheretheyhavedemonstratedhighselectivityandactivity.

Moreover,PQDshavealsobeenutilizedinenvironmentalmonitoring,specificallyfordetectingpollutantsinwaterandair.Theirsensitivity,selectivity,andrapidresponsemakethemidealforuseinsensors.Forinstance,researchershavedevelopedPQD-basedsensorsfordetectingheavymetalionsinwater,whichcouldhelpinensuringthesafetyofdrinkingwater.

Lastly,PQDshavealsoshownpotentialinthefieldofenergystorage.StudieshaveshownthatbyincorporatingPQDsintoelectrodesofbatteries,itispossibletoimprovetheircapacityandcyclingstability.ThisisattributedtothehighsurfaceareaandconductivityofPQDs,whichenhancetheelectrochemicalperformanceoftheb