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1、www.particle-journal.comwww.MaterialsViews.comWater-SolubleMonolayerMolybdenumDisul?deQuantumDotswithUpconversionFluorescenceFULLPAPERHaoHuang,CuicuiDu,HongyanShi,XunFeng,JinLi,YanleiTan,andWenboSong*hydrogenstorage,[10]nano-lubrication,[11]Uniformwater-solublemonolayerMoS2quantumdots(M
2、QDs)withlaterallithiumionbatteries,[12]andbiomedicalsizesof≈2.1nm,aclearlyzigzag-terminatededge,andahexagonallatticeimaging.[13]Fewworksemergedverystructureareachievedusingammoniummolybdate,thiourea,andN-acetyl-recentlyconcerningisolationanddepo-L-cysteine(NAC)asprecursorsandthecappingr
3、eagentinafacileone-potsitionofhigh-qualitymonolayerMoS2nanosheetsbythetop-down[14]andbottom-hydrothermalapproach.MQDshavegooddispersityandhighstabilityin[9a,15]upapproaches.Dramaticchangesinaqueoussuspensionandexhibitasigni?cantlylargerdirectbandgaptheelectronicstructureandopticalprop-(
4、3.96eV)comparedtomonolayerMoS2nanosheets(1.89eV).Pronouncedertiescomparedtothebulkcounterpartsblue-shiftsinthewavelengthsofboththeexcitonicabsorptionandintrinsicwereobservedinthese2Dultrathinatomiclayerstructures.[16]Whenthelateralsizestateemissionwithactivatedstrongluminescenceatroomte
5、mperatureofmonolayerMoS2nanosheetsfurtherbeyondmonolayerMoS2nanosheetsisdemonstrated.Unusualupconver-reducestolessthan10nmleadingtosionphotoluminescenceisalsoobservedandiscausedbytwosuccessivemonolayerMoS2quantumdots(MQDs),transfersofenergyfromthenear-infrared(NIR)absorptiongeneratedbyt
6、heextra?uorescentpropertybeyondsingle-NACcappingreagenttothehexagonalstructureofMQDs.AdditionalopticallayerMoS2nanosheetsmightbeobtained,propertiesofMQDsmayprovidenumerousexcitingtechnologicalapplica-sincepronouncedsizablebandgapinsemiconductingTMDshasalreadybeentions.Here,MQDsaredemons
7、tratedasahighlyselective?uorescentreagentpredicted.[17]However,rigorouscontrolfordetectingtetracyclinehydrochlorideunderUVandNIRirradiation.ofthethicknessandlateralsizeofthesenanosheetsisstillahugechallenge.ExploitationofmonolayerMQDswith1.Introductionextraopticalpropertieshasn
