as..IntroductionAsanimportantindustrialchemical,formaldehydeisutilizedinthemanufacturingofbuildingboards,plywood,andlacquermaterials[,].Moreover,itisanintermediateinconsumerproducts,suchasdetergentsandsoaps,andalsousedinpharmacologyandmedicinebecauseofitssterilizationproperty.However,theinvestigatedresultsshowedthatformaldehydecouldcausemanydamagestothehumanbodybecauseitisavolatileanddeleteriouscompound[,].Therefore,effectivemethodstomonitorformaldehydehavebeendemandedforatmosphericenvironmentalmeasurementandcontrol.Thefabricationofgassensorsisthoughttobeadesirablemeansformonitoringthegases.Ourpresentinvestigationmainlydealswiththedetectionofformaldehyde.Althoughgassensorsbasedonsemiconductormetaloxidesprovidethesafedetectionoftoxicorflammablegases,theystillhavesomelimitationsandchallengessuchassensitivity,selectivity,long-termstability,andsoon.Toovercomethedisadvantagesofsemiconductormetaloxidegassensors,theresearchonprep