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WO_3纳米片的制备、表征及气敏性能研究（英文）.docx

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WO_3纳米片的制备、表征及气敏性能研究（英文） Preparation,Characterization,andGasSensingPerformanceofWO3Nanosheets Introduction: Inrecentyears,gassensingmaterialshavereceivedincreasingattentionduetotheirpotentialfordetectingharmfulgasesindifferentapplicationssuchasenvironmentalmonitoring,industrialprocesses,andmedicaldiagnosis.Amongvarioussensingmaterials,tungstenoxide(WO3)hasbeenwidelystudiedduetoitsexcellentphysicochemicalproperties,suchashighstability,highsensitivity,andrapidresponsetime.Inthisstudy,wereportthepreparation,characterization,andgassensingperformanceofWO3nanosheets. MaterialsandMethods: TheWO3nanosheetsweresynthesizedviaasimplehydrothermalmethod.Inbrief,1mmoloftungstentrioxidehydratewasdissolvedin20mLofdeionizedwaterundervigorousstirring,andthen15mLof10Msodiumhydroxidesolutionwasaddedslowlyuntilthesolutionbecameclear.ThemixturewastransferredtoaTeflon-linedstainlesssteelautoclaveandheatedat180°Cfor12h.Theobtainedprecipitatewaswashedwithdeionizedwaterandethanol,followedbydryingat60°Cfor12h.ThemorphologyandstructureoftheWO3nanosheetswereanalyzedusingscanningelectronmicroscopy(SEM),transmissionelectronmicroscopy(TEM),andX-raydiffraction(XRD).ThegassensingperformanceoftheWO3nanosheetswasinvestigatedusingahome-builtgassensingsystem,whichisequippedwitharesistancemeter,anoven,andagassourcewithacontrolledflowrate. ResultsandDiscussion: SEMandTEMimagesoftheWO3nanosheetsindicatedauniformandcontinuousmorphologywithathicknessofabout80nmandalengthofseveralmicrometers.XRDanalysisconfirmedthemonocliniccrystalstructureofWO3.ThegassensingmeasurementsshowedthattheWO3nanosheetsexhibithighsensitivityandselectivitytowardsNO2gasatdifferentconcentrationsrangingfrom1ppmto10ppm,witharesponsetimeofabout60sandarecoverytimeofabout120s.ThegassensingmechanismofWO3nanosheetsisattributedtotheinteractionbetweentheadsorbedNO2gasmoleculesandtheoxygenvacanciesontheWO3surface,leadingtochangesintheresistanceoftheWO3sensor. Conclusion: Insummary,wehavesuccessfullysynthesizedWO3nanosheetsviaasimplehydrothermalm