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时间:2020-03-26
《基于聚合物多齿配体的高性能CdTe量子点的微波水相合成.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、物理化学学报(WuliHuaxueXuebao)ActaP.一Chim.Sin.2014,30(5),994-1000May【Article】doi:10.3866/PKU.WHXB201403131www.whxb.pku.edu.cn基于聚合物多齿配体的高性能Cd're量子点的微波水相合成宇文力辉薛冰汪联辉’(南京邮电大学信息材料与纳米技术研究院,南京210023)摘要:针对当前水相合成的量子点(QDs)光性能与稳定性等方面存在的不足,发展了基于聚合物多齿配体的水相制备策略.利用巯基修饰的聚丙烯酸(P
2、AA-SH)作为多齿配体代替常用的巯基丙酸等单齿配体,结合微波辅助加热制备了CdTe量子点,研究了多齿配体对量子点的生长机制与荧光性能的影响.以PAA-SH为配体制备的CdTe量子点荧光性能优异(荧光量子效率(PLQY)~达75%),流体力学直径较4,(-10nm),稳定性也有明显提高.基于聚合物多齿配体的量子点制备技术有助于实现生物医学研究中急需的兼具高亮度、高稳定性、小尺寸等特征的高性能量子点生物探针的制备.关键词:多齿配体;高性能量子点:微波水相合成中图分类号:0649SynthesisofHigh
3、QualityCdTeQuantumDotsinAqueousSolutionUsingMultidentatePolymerLigandsunderMicrowaveIrradiationYUWENLi-HuiXUEBingWANGLian—Hui(InstituteofAdvancedMaterials,NanjingUniversityofPostsandTelecommunications,Nanjing210023,PR.China)Abstract:QuantumdotsfQDs)havere
4、centlyattractedconsiderableattentionduetotheiruniqueopticalpropertiesandpotentialapplicationsinbiomedicineandoptoelectronics.AlthoughtheorganicsynthesisofQDsispopular,aqueoussynthesisisalsoveryattractivenotonlyforitslowcost,Iowtoxicity,andlowreactiontempe
5、rature.butalsobecausetheas.preparedQDscanbeuseddirectlyforbio—relatedapplicationswithouttherequirementforcomplicatedsurfacemodificationprocesses.However.themonodentateIigandstypicallyusedforaqueoussynthesishavelimitedbindingability.whichcanleadtoweakcollo
6、idalstabilityandlowphotoluminescence.Tosolvetheseproblems,weexploredtheuseofmultidentatethiol—containingpolymer(PAA-SH1asaIigandtosynthesizeCdTeQDsandstudiedtheinfluenceoftheIigandonthegrowthmechanismandphotoluminescentpropertiesoftheQDs.PAA-SHwassynthesi
7、zedbyconjugatingcysteaminetopoly(acrylicacid)(PAA)inthepresenceofdicyclohexylcarbodiimide.CdTeQDsofdiferentsizeswerepreparedinaqueoussolutionsusingPAA-SHasaligandundermicrowaveirradiation.TheresultingPAA-SH-cappedCdTeQDsshowhighphotoluminescencequantumyie
8、ldfPLQY)fupto75%)withoutCdSshelIcoating,whichjsmuchbetterthantheCdTeQDssynthesizedusingmonodentateligands.Furthermore.thehydrodynamicdiameterofthePAA-SH.coatedCdTeQDsisabout10nm.andthereforemuchsmallerthanthepolymer
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