26439.水溶性碲化鎘量子點在檢測應(yīng)用中的尺寸效應(yīng)及其在hg2和ag檢測中的應(yīng)用研究

1、水溶性碲化鎘量子點在檢測應(yīng)用中的尺寸效應(yīng)及其在H92和Ag檢測中的應(yīng)用研究專業(yè)名稱：申請人：指導(dǎo)教師：物理化學(xué)焦杭州梁振華張凌論文答辯委員會主席：委員：趲鱉廣西師范大學(xué)碩士學(xué)位論文ThesizeeffectofwatersolublecadmiumtelluridequantumdotinthedetectionapplicationsanditsresearchonH92andAgdetectionPostgraduate：JiaoH

2、angzhouSupervisor：LiangZhenhuaZhangLingMaior：PhysicalChemistryOrientation：NanomaterialsAbstractTheheavymetalioncontaminationhasattractedpeoplesextensiveattentionbecauseoftheirtoxicityInrecentyears，poisoningbecausepeoplew

3、ronglyeatsubstanceswhichcontainheavymetalionsWascommonlyoccurred，SOthedetectionofheavymetalionsisparticularlyimportantBecauseoftheirsuperiorfluorescence，quantumdots(QDs)playedailimportantroleinthedetectionofheavymetalion

4、sHoweverthedetectionofheavymetalionsisprimarilybychangingtheligandsonthesurfaceoftheQDstodetectdifferentmetalionsThesizedependentlyopticalandphysicalpropertiesofsemiconductorQDshadbeenwelldocumentedbuttheireffectsonsensi

5、ngpertbnnancewererarelyinvestigatedInadditionthewateroftencontainsavarietyofmetalions，therefore，tealizethesimultaneouslydetectionoftwoormoremetalionsisrathersignificantThisstudyismainlytostudytheimpactoftheparticlesizeof

6、theQDsforthedetectionofmetalionsFirst，homocysteine，L—cysteineandmercaptoacidcappedCdTeQDsweresynthesizedunderthesameconditionstoobtiondifferentsizesofCdTeQDsTheQDswerecharacterizedbyfluorescencespectroscopywhilethenewlig

7、andshomocysteinemodifiedCdTequanmmdotswereXRDcharacterizationBeforethemetalionsdetected，weinvestedthePHvalue，bufferconcentrationandtheconcentrationofquantumdotswhichimpactedonitThenthedifferentsizesofQDswereusedfordetect

8、ingthecommonmetalionsWefoundtllatthesmallQDsarequenchedbyH92，withtheparticleincreasing，theQDsbecomesnotobvioustoH92whilebecomemoreandmoresensitivetoA。rTheexperimentsconfirmedthattheQDshadasignificantsizeeffectinthedetect

9、ionofheavymetalionsMeanwhile，thelargesizeofhomocysteinecappedCdTequantumdotsforA，detectionlimitsisaslowas83riM，lowerthaneverbeforeontheArlowerdetectionlimitsWhiletakingadvantageofthestandardadditionmethodforpondwaterandl