SnO2基 R134a氣體傳感器ppt

SnO2-basedR134agassensor－Sensingmaterials

preparation,gasresponseandsensingmechanism

（SnO2基R134a氣體傳感器：傳感材料的制備，

氣體響應和傳感機理）成員：李月飛201213316

郭建軍201213325作者介紹：陳俊琛，2008年獲得上海大學應用化學專業(yè)學士學位。此后，她繼續(xù)攻讀上海大學無機化學理科碩士學位。目前，她主要研究方向是合成以SnO2和Al2O3材料的介孔結構以及其在氣體傳感器中的應用。徐甲強，1988年畢業(yè)于中國科技大學材料科學系，并獲理學碩士學位。2005年獲得上海大學材料科學博士學位。他研究方向包括氣體傳感器，納米材料的合成和應用。Contents：AbstractIntroductionExperimentalResultsanddiscussionConclusionsContents：AbstractIntroductionExperimentalResultsanddiscussionConclusions

Abstract：

◆TheexperimentalresultsindicatedthattheresponsetowardsR134a

oftheSnO2-based

gassensorcanbesignificantlyenhancedbyloadingnoblemetalandusingcatalyticcoating.◆ThesensorbasedonadoublelayerfilmSnO2(Au)/Al2O3(Au)showedsatisfactoryresultsincludinglargeresponse,goodselectivity,highlong-termstability,fastresponseandrecovery,revealingitspotentialapplicationinthedetectionofrefrigerantsandthemaintenanceofairconditionsystems.（基于雙層薄膜SnO2（Au）/zAl2O3（Au）的傳感器展示出令人滿意的結果，，，顯示出其在制冷劑檢測及空調系統(tǒng)維護方面有應用潛力。）

補充：

氣體傳感器定義：能夠采集氣體的某些信息（如：濃度、種類）并把采集到的信息轉化為人們更易識別的信號（如電信號、聲信號、光信號、數字信號等）,凡是具有這種功能的部件或裝置，就是氣體傳感器。Contents：AbstractIntroductionExperimentalResultsanddiscussionConclusions

Introduction：

WedisclosethatSnO2sensorsdecoratedbyAu-,Ag-,Pt-loadingandAl2O3catalystcoatingwereusedtoimprovetheresponsetoR134a.TheresultsindicatethatthenewtypeofgassensortowardsR134awithlargeresponse,goodselectivity,highlong-termstability,fastresponseandrecoverycanbeobtained.（結果表明，新型氣體傳感器對R134a的響應大，選擇性好，長期穩(wěn)定性高，響應快和可恢復。）Contents：AbstractIntroductionExperimentalResultsanddiscussionConclusions

Experimental：

Fig.1.Sketchofthegassensorstructure.Contents：AbstractIntroductionExperimentalResultsanddiscussionConclusions

Structureandmorphology：

Fig.2.TEMimagesofSnO2.

Structureandmorphology：

Fig.3.TEMimagesofporousAl2O3.

Structureandmorphology：

Fig.4.SEMimagesofSnO2.

Speculateone：

●Basedontheseobservations，wespeculatethatmesoscopicporesmayprovidemoregaschannelsandimprovetheefficiencyintransportationofgases,whichisafavourablefeatureforgassensing.（基于這些觀察，我們推測，介觀孔可以提供更多的氣體通道提高運輸氣體的效率，這是氣體傳感一個有利的特征。）

Structureandmorphology：

Fig.5.Nitrogenadsorptionisothermsandcorrespondingporesizedistribution(inset)oftheporousAl2O3annealedat500?C.

Speculatetwo：

●WespeculatethatitisduetotheproperporesizecanR134afragmentsreachtheSnO2layerthroughtheporousAl2O3layer.（我們猜想正是由于有適當的孔徑，R134a碎片才能通過多孔氧化鋁層到達到SnO2層.）

Gas-sensingproperties：

Fig.6.Theresponseto100ppmR134aofSnO2withandwithoutCl?atdifferentpHandtheresponsesto100ppmR134aoffourkindsofsensorsatdifferentworkingtemperature(inset).

Conclusionone：

★WeobservedthatSnO2withoutcontainingCl?hadhigherresponsethanthatofSnO2containingCl?;bothofthetwoseriesofSnO2obtainedatpH=3hadthelargestresponse.Conclusiontwo：

★TheresultssuggestthatSnO2(Au)/Al2O3(Au)hastheoveralllargestresponse;itsresponsevaluetowardsR134aat100ppmreachesashighas8.7.（結果表明,SnO2(Au)/Al2O3(Au)整體響應最大;在100ppm時，對R134a的響應值高達8.7。）

Theresultsrevealthatthegassensorsallreachtheirhighestresponseat350?C,sowechoose350?Casanoptimalworkingtemperature.

（350?C最佳響應溫度。）Gas-sensingproperties：Fig.8.StabilityofSnO2(Au)/Al2O3(Au)to100ppmR134a.Conclusion：◆ThestableresponsevalueindicatesthatthesensorbasedonSnO2(Au)/Al2O3(Au)exhibitshighlong-termstability.（這些穩(wěn)定的響應值表明,基于SnO2(Au)/Al2O3(Au)的傳感器具有長期穩(wěn)定性高的特性。）Gas-sensingproperties：Fig.9.ResponseofSnO2(Au)/Al2O3(Au)todifferentgasesat100ppm.Conclusion：◆Wegettheconclusionthatthesensorshaveafairselectivity,butsomeissueswithseveralinterferences(ethanol,acetoneandsoon)stillexist.（公平選擇性，存在干擾因素如乙醇，丙酮等）Gas-sensingproperties：■Tosumup,thesensorbasedondoublelayerfilmofSnO2(Au)/Al2O3(Au)showssatisfactorysensingpropertiesforR134adetection.IthaspromisingprospectinmonitoringtheleakageandconcentrationoftheR134aescapedduringtheproductionandapplicationofrefrigerants.（總之,SnO2(Au)/Al2O3(Au)傳感器對R134a檢測顯示了滿意的傳感性能。其在制冷劑檢測及空調系統(tǒng)維護方面有應用潛力。）Gas-sensingmechanismofR134a：Fig.10.FT-IRspectraofSnO2beforeandaftercalcinatingat350?CinR134a.（橫：波數：縱：透射度）Speculate:★TheFT-IRspectrumshowninFig.10displaysnosignificantdifferencebeforeandaftercalcinatingtheSnO2at350?CunderR134a,becausethatthepeakdisplayedintherangeof4000–3500cm?1belongstoH2O,andthepeakintherangeof1000–500cm?1isthebondofSn–O.（沒明顯差異，峰值范圍）Gas-sensingmechanismofR134a：Fig.11.FT-IRspectraofAl2O3beforeandaftercalcinatingat350?CinR134a.Speculate:★TheFT-IRspectrumshowninFig.11demonstratesanobviouschangeintherangeof500–1000cm?1beforeandaftercalcinatingtheAl2O3at350?CunderR134a.Thischangema