Chemical Research in Chinese Universities ›› 2015, Vol. 31 ›› Issue (4): 514-518.doi: 10.1007/s40242-015-5110-6

• Articles • Previous Articles     Next Articles

Investigation on Ligand Exchange Kinetics on CdSe/ZnS Quantum Dot Surface Utilizing Pyrene as Flourescent Probe

CHANG Yulei1,3, LIU Nian2, LIU Huan1, YANG Yanming4, ZHAO Yili1, LI Yapeng1, YUAN Hang2   

  1. 1. Alan G. MacDiarmid Institute, College of Chemistry, Jilin University, Changchun 130012, P. R. China;
    2. The First Hospital of Jilin University, Changchun 130021, P. R. China;
    3. State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, P. R. China;
    4. The Second Hospital of Jilin University, Changchun 130041, P. R. China
  • Received:2015-03-20 Revised:2015-04-21 Online:2015-08-01 Published:2015-07-22
  • Contact: LI Yapeng, YUAN Hang E-mail:liyapeng@jlu.edu.cn;hangyuan75@foxmail.com
  • Supported by:

    Supported by the National Natural Science Foundation of China (No.21304084), the Youth Foundation of Jilin Province, China(No.20080119) and the Graduate Innovation Program of Jilin University, China(No.20091010).

Abstract:

Direct ligand exchange kinetics between hydrophilic molecules and quantum dots(QDs) was investigated. Meanwhile, pyrene was exploited as probe to detect the efficiency of the ligand exchange reaction between octadecylamine-coated QDs(ODA-QDs) and different ligands[ligand 1: NH2G3-OH, ligand 2: G4.5-PEG5-FA5, ligand 3: (COOH)2G3-OH or ligand 4: G4.5-PEG1-FA1]. It was indicated that water-soluble QDs exhibit the same fluorescence and absorption spectra as ODA-QDs when they were dissolved in chloroform. Furthermore, the cellular experiments demonstrated that the folic acid(FA) targeting poly(amidoamine)(PAMAM) modified QD conjugates could be used as molecular targeting sensing systems for nanoparticle probes.

Key words: Fluorescent probe, Ligand exchange kinetic, Poly(amidoamine) dendrimer, Pyrene, Quantum dot