CdTe量子点荧光猝灭法测定对硝基苯胺的含量  

p-Nitroaniline determination based on fluorescence quenching of CdTe quantum dots

作　　者：陈志兵[1,2] 马凤侠[2] 刘夏[2] 卞丽霞[2] 

机构地区：[1]自旋电子与纳米材料安徽省重点实验室培育基地,安徽宿州234000 [2]宿州学院化学与生命科学学院,安徽宿州234000

出　　处：《化学研究与应用》2011年第12期1654-1656,共3页Chemical Research and Application

基　　金：国家自然科学基金项目(20871089)资助;安徽省教育厅重大项目(KJ2010ZD09)资助;安徽省优秀青年人才基金项目(2009SQRZ173ZD)资助;宿州学院科研平台开放课题(2010YKF05)资助

摘　　要：以CdTe量子点作为荧光探针,基于荧光猝灭法对对硝基苯胺进行了定量检测,考察了缓冲溶液体系、量子点浓度、反应时间等多种因素的影响。实验结果表明,在pH 7.7的0.2 mol/L Na2HPO4-NaH2PO4缓冲液中,反应时间为10 min,对硝基苯胺浓度为1.2×10-6～2.0×10-5 mol/L范围时,其线性回归方程为F0/F=0.9950+0.0207 c(10-6mol/L),相关指数和检测限分别为0.9992和2.5×10-7mol/L。By using CdTe quantum dots（QDs）as fluorescent（PL）probe,p-Nitroaniline（PNA）was quantitatively detected based on PL quenching CdTe QDs.The influences of concentration of buffer solution,QDs and the incubation time were investigated and optimized in view of their influence on the FL behavior.The results indicated that in a Na2HPO4-NaH2PO4 buffer solution with pH value of 7.7 and 10 min of incubation,the emission intensity of CdTe QDs and the concentration of PNA follow the Sterm-Volmer equation in the range of 1.2×10-6～2.0×10-5mol/L.The obtained linear fitting equation is：F0 /F=0.9950＋0.0207 c（10-6mol/L）with the correlation coefficient of 0.9992.The detection limitation can be 2.5×10-7mol/L.The results in this work indicate that CdTe QDs can provide a new luminescent probe for detecting PNA with a wide detecting range and extremely high sensitivity.

关 键 词：CDTE量子点 对硝基苯胺 荧光猝灭 

分 类 号：O657.3[理学—分析化学]