Easy synthesis of highly fluorescent carbon quantum dots from gelatin and their luminescent properties and applications.pdf

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1、CARBON60(2013)421–428Availableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/carbonEasysynthesisofhighlyfluorescentcarbonquantumdotsfromgelatinandtheirluminescentpropertiesandapplicationsQinghuaLiang,WangjingMa,YaoShi,ZhiLi*,XinmingYangT

2、echnicalInstituteofPhysicsandChemistry,ChineseAcademyofSciences(CAS),29ZhongguancunEastRoad,Beijing100190,PRChinaARTICLEINFOABSTRACTArticlehistory:Asimpleapproachforthesynthesisoffluorescentcarbondots(CQDs)hasbeendevelopedReceived30January2013bythehydro

3、thermaltreatmentofgelatininthepresenceonlypurewater.Theas-synthe-Accepted17April2013sizedCQDswerefoundtoemitbluephotoluminescence(PL)withamaximumquantumAvailableonline24April2013yieldof31.6%.Meanwhile,theCQDsexhibitexcitation-dependent,pH-sensitiveandu

4、p-convertedPLproperties.Importantly,theseCQDsaredemonstratedtobeexcellentbioi-magingagentsandfluorescentinkduetotheirstableemission,welldispersibility,lowtox-icity,longemissionlifetime,andgoodcompatibilitywithcellsandmacromolecules.Ó2013ElsevierLtd.Allr

5、ightsreserved.1.Introductiontion[16],laserablation[17],hydrothermaltreatments[18],microwave/ultrasonicpassivation[7,19],andplasmatreat-Duringthepastdecades,duetotheiruniqueopticalandelec-ment[20]inrecentyearshavebeendevelopedtopreparetronicpropertiesca

6、usedbythequantumconfinementandCQDswithvariousprecursors(suchasgraphiteoxide[21],cit-edgeeffects,luminescentquantumdots(QDs)haveattractedricacid[22],glycerol[23],coffeegrounds[24],soymilk[25],considerableinterestforthepromisingcandidatestoreplacegrass[26

7、],egg[20],andsoon).Despitemanyimpressivead-theconventionalphosphormaterials[1–7].However,thetra-vances,itisstilldesirableandurgenttorapidlysynthesizeditionalsemiconductorQDsbasedonmetallicelements,suchhigh-qualityCQDsbyaneasyandenvironmentallybenignasC

8、dS,CdSe,PbSeandAg2S,moreorlesssufferfromthemethodwithlow-costrawmaterials.problemsoftoxicity,hydrophobicityandhighcost,whichRecently,asatraditionalsoftchemicalpreparationroute,limitstheirpracticalapplication.Asanewtypeofthenano-thehydro