wireless gas sensor using CNT_PMMA thin film chemiresistor

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1、INSTITUTEOFPHYSICSPUBLISHINGSMARTMATERIALSANDSTRUCTURESSmartMater.Struct.13(2004)10451049PII:S0964-1726(04)82882-9Acompactwirelessgassensorusingacarbonnanotube/PMMAthinfilmchemiresistorJoseKAbraham1,BijuPhilip1,AshwinWitchurch1,VijayKVaradan1andCChannaReddy21CenterforEngineeringofEle

2、ctronicsandAcousticsMaterialsandDevices,PennsylvaniaStateUniversity,UniversityPark,PA16802,USA2TheHuckInstituteofLifeSciences,PennsylvaniaStateUniversity,UniversityPark,PA16802,USAReceived16February2004,infinalform17June2004Published6August2004Onlineatstacks.iop.org/SMS/13/1045doi:10

3、.1088/0964-1726/13/5/010AbstractThedesignanddevelopmentofacompactwirelessgassensorwithasurfacemodifiedmultiwalledcarbonnanotube(f-CNT)chemiresistorasthesensingelementispresentedinthispaper.f-CNT/polymercompositesensingfilmispatternedonaprintedcircuitboardandisintegratedtothewirelesssy

4、stem.ThechangeinresistanceoftheCNT/polymercompositefilmduetoexposureofdifferentgasesisutilizedastheprincipleofthisgassensor.Theresponsefordifferentorganicvaporsareevaluatedanditisobservedthatthef-CNT/PMMAcompositefilmshowsfastresponseandchangeinresistanceoftheorderof102103duetoitssurf

5、acemodification.(Somefiguresinthisarticleareincolouronlyintheelectronicversion)1.Introductionandmechanicalproperties.ThesepropertiesmakethempotentialcandidatesforbuildingblocksofactivematerialsAdvancementsinmicrotechnologyandtheevolutionofnewinnanoelectronics,fieldemissiondevices,gasst

6、orageandnanomaterialsanddeviceshavebeenplayingakeyrolegassensors[13].Amongthese,theroomtemperaturegasinthedevelopmentofveryaccurateandreliablesensors.sensingpropertyisveryattractiveformanyapplications[4,5].ThetechnologyofmicrosensorshasdevelopedtremendouslyThelargesurfaceareaprovide

7、dbythehollowcoresandinthelastdecadebyjoiningmanyscientificachievementsoutsidewallsinnanotubesgivesthemverylargegasabsorptivefromvariousdisciplines,offeringnewerchallengesandcapacity.Interactionwithanygascanchangetheelectricalopportunities.Thequestforeversmallerdevicescapablepropertie

8、sofCNTsatroomtemper