Hydrophilic Character of Single-Layer MoS 2 Grown on Ag ( 111 ) - Tumino et al. - Unknown - Unknown

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SUPPLEMENTARYINFORMATIONHydrophilicCharacterofSingle-LayerMoS2GrownonAg(111)FrancescoTumino1,∗,CarloGrazianetti2,∗∗,ChristianMartella2,MarinaRuggeri1,ValeriaRusso1,AndreaLiBassi1,AlessandroMolle2andCarloS.Casari11DepartmentofEnergy,PolitecnicodiMilano,viaG.Ponzio34/3,Milano,I-20133,Italy2CNR-IMMUnitofAgrateBrianza,viaC.Olivetti2,AgrateBrianza,I-20864,ItalyE-mail:∗francesco.tumino@polimi.it,∗∗cgrazianetti@mdm.imm.cnr.itSupplementarydataFigureS1:(a)STMimageofpristineAg(111).(b)STMimageofMoS2onAg(111)producedbyPLDwith15laserpulses.Thebrightclustersaresecondlayerislandsgrowingontopofthesingle-layerfilm.after4daysMoS2/Ag(111)IncleanAg(111)tensity(arb1.41.61.822.22.4.unEnergy(eV).)FigureS2:PhotoluminescencespectraofcleanAg(111)(red),freshlyexposedMoS2/Ag(111)(blue)andafter4daysinambientconditions.Thedataareverticallystackedforclarity.S1

1382.540415daysIntensity(arb30days.un.)340360380400420440-1Ramanshift(cm)FigureS3:RamanspectraofSLMoS2onAg(111)acquiredafter15days(top)and30days(bottom)ofairexposure.Bluedashedlinesindicatethemainpeakspositionsat382.5and404cm−1.E'A'14days3days2daysIntens1dayity(arb.asexposedun.)325350375400425450-1Ramanshift(cm)FigureS4:Ramanspectraofsingle-layerMoS2onAu(111)forincreasingairexposuretime.Thespectraareverticallystackedforclarity.BluedashedlinesindicatethepeakpositionsofE0andA0.1S2

2FigureS5:S2p(left)andMo3d(right)corelevelsofreferencebulkMoS2crystal.Opencirclesarerawdata,bluecurveisthefullfitafterbackgroundremoval(blackcurve),orangecurveisS2scorelevel,redsolidcurvesareMo4+andS2−states.FigureS6:O1scorelevelafter24hoursairexposure(left)andafter48hours(right).RedsolidcurvesarerelatedtoadsorbedO2,reddashedcurvestoOH-groups,bluesolidcurvesarefullfitofrawdatareportedasopencircles.40days1day200250300350400450500550-1Ramanshift(cm)FigureS7:ComparisonoftheRamanspectraafteroneday(blackcurve)andfortydays(redcurve)afterthecappingwiththePMMAprotectivelayer.S3