Investigations on the sensing mechanism of humidity sensors based on electrospun polymer nanofibers.pdf

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1、SensorsandActuatorsB171–172(2012)309–314ContentslistsavailableatSciVerseScienceDirectSensorsandActuatorsB:Chemicaljournalhomepage:www.elsevier.com/locate/snbInvestigationsonthesensingmechanismofhumiditysensorsbasedonelectrospunpolymernanofibersQianqian∗Lin,Yang

2、Li,MujieYangDepartmentofPolymerScienceandEngineering,CyrusTangCenterforSensorMaterialsandApplications,ZhejiangUniversity,MOEKeyLaboratoryofMacromolecularSynthesisandFunctionalization,Hangzhou310027,ChinaarticleinfoabstractArticlehistory:Humiditysensingmechanis

3、mofsensorsbasedonelectrospunpolyaniline(PANI)nanofiberswasReceived12December2011investigated.DynamicadsorptionanddesorptionbehaviorofthePANInanofibersunderdifferenthumid-Receivedinrevisedform1March2012itylevelsweremonitoredbyquartzcrystalmicrobalancemeasurements

4、andcomparedwiththeir30March2012AcceptedimpedanceAvailableonline15June2012response.Itwasfoundthatthenanofibersensorexhibitedfast,reversibleandhighlysen-sitiveimpedancechangeasafunctionofwatermoleculesadsorbed.NyquistplotsandBodeplotsofthenanofiberKeywords:humidit

5、ysensorunderdifferenthumiditylevelswereobtainedbyelectrochemicalimpedancespectrameasurementsatroomtemperature.AnelectricalequivalentcircuitwasestablishedtomodelHumiditysensorthemechanismimpedanceresponsetohumidityvariationofthenanofibersensor.Calculatedresultsu

6、singthemodelSensingfittedquitewellwiththemeasuredspectra.ExplorationofthesensingmechanismwasattemptedbyElectrochemicalimpedancespectracorrelatingthevariationwithhumidityofthreecomponentsoftheequivalentcircuittothemorphologyPolyanilinenanofiberofElectrospinningth

7、eelectrospunnanofibersensors.©2012ElsevierB.V.Allrightsreserved.1.Introductionon-linewithquartzcrystalmicrobalance(QCM)byresearchgroupsofDemirandErol,andthesensingmechanismwasproposedInthepastfewdecades,greatadvanceshavebeenmadein[16,17].Suetal.reportedtheinves

8、tigationsontheadsorptionthedevelopmentofvarioustypesofhumiditysensors.Researchesanddesorptionkineticsofhumiditysensorsbasedonpoly-inthefieldmainlyfocusedondesigningandpreparationofm