Fine-tuning of ceramic-based chemical sensors via novel microstructural modification

Fine-tuning of ceramic-based chemical sensors via novel microstructural modification

ID:39398686

大小:2.07 MB

页数:10页

时间:2019-07-02

Fine-tuning of ceramic-based chemical sensors via novel microstructural modification_第1页
Fine-tuning of ceramic-based chemical sensors via novel microstructural modification_第2页
Fine-tuning of ceramic-based chemical sensors via novel microstructural modification_第3页
Fine-tuning of ceramic-based chemical sensors via novel microstructural modification_第4页
Fine-tuning of ceramic-based chemical sensors via novel microstructural modification_第5页
资源描述:

《Fine-tuning of ceramic-based chemical sensors via novel microstructural modification》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库

1、SensorsandActuatorsB120(2006)2534Fine-tuningofceramic-basedchemicalsensorsvianovelmicrostructuralmodificationPartII:LowlevelCOsensingbymolybdenumoxide,MoO3Abdul-MajeedAzad∗DepartmentofChemicalandEnvironmentalEngineering,TheUniversityofToledo,3052NitschkeHall,Toledo,OH43606-3390,USAReceiv

2、ed2November2005;receivedinrevisedform27December2005;accepted23January2006Availableonline28February2006AbstractEmployingabuffergasmixtureofCOandCO2,theequilibriumoxygenpartialpressurewasvariedacrosstheMo/MoO3proximitylinebyvaryingtheratioofconcentrationofthetwogases,asdescribedinanearlie

3、rcommunication.ThisledtothereductionofMoO3inonecaseandoxidationofthereducedphase(MoorMoO2)intheotherwithaconcomitantvariationinthemicrostructuralfeaturesoftheresultingspecies.Theformationandgrowthofthenewoxidesurfaceunderconditionsofoxygenpotentialmodulationhasbeenfoundtoimpartenhanceds

4、ensingcharacteristicstotheMoO3-basedchemicalsensorsforlowlevelsofcarbonmonoxide(14100ppmCO)intheambient.©2006ElsevierB.V.Allrightsreserved.Keywords:Semiconductingoxides;MoO3;Chemicalsensors;Microstructure;Carbonmonoxide1.Introductionasfollows.Atagiventemperatureandstandardpressure(ambi-

5、ent;1atm),theoxidationofametaltoitsoxideorreductionofMaterialswithnanofeaturesareofimmenserelevanceisanoxidetometaloritssuboxideoccursatawell-definedfinitethefieldofsolid-stateceramic-basedchemicalsensors.Highpartialpressureofoxygen.Ifthetwophases(metal/metaloxideselectivity,enhancedsensit

6、ivityandshortresponsetimeareormetalsuboxide/metaloxide)areinequilibrium,theincum-someofthekeyfeaturessoughtinthesedevices.Sincethebentoxygenpartialpressureisrecognizedastheequilibriumsensingmechanismandcatalyticactivityofceramicsarepartialpressure.AccordingtotheGibbsphaserule,oneitherla

7、rgelymicrostructure-dominated,benignsurfacefeaturessuchsideofthisuniqueoxygenpressure,atagiventemperature,oneassmallgrainsize,largesurfacearea,highaspectratioand,ofthetwocoexistingphasesmustdisappear.FortheMo/MoO3open/connectedporosityarerequiredtorealizeasuccessfulsen-coexiste

当前文档最多预览五页,下载文档查看全文

此文档下载收益归作者所有

当前文档最多预览五页,下载文档查看全文
温馨提示:
1. 部分包含数学公式或PPT动画的文件,查看预览时可能会显示错乱或异常,文件下载后无此问题,请放心下载。
2. 本文档由用户上传,版权归属用户,天天文库负责整理代发布。如果您对本文档版权有争议请及时联系客服。
3. 下载前请仔细阅读文档内容,确认文档内容符合您的需求后进行下载,若出现内容与标题不符可向本站投诉处理。
4. 下载文档时可能由于网络波动等原因无法下载或下载错误,付费完成后未能成功下载的用户请联系客服处理。