Title of article :
Thiolated DAB dendrimers and CdSe quantum dots nanocomposites for Cd(II) or Pb(II) sensing
Author/Authors :
Algarra، نويسنده , , M. and Campos، نويسنده , , B.B. and Alonso، نويسنده , , Patricia B. de Miranda، نويسنده , , M.S. and Martيnez، نويسنده , , ء.M. and Casado، نويسنده , , C.M. and Esteves da Silva، نويسنده , , J.C.G.، نويسنده ,
Issue Information :
ماهنامه با شماره پیاپی سال 2012
Abstract :
Four different generation of thiol-DAB dendrimers were synthesized, S-DAB-Gx (x = 1, 2, 3 and 5), and coupled with CdSe quantum dots, to obtain fluorescent nanocomposites as metal ions sensing. Cd(II) and Pb(II) showed the higher enhancement and quenching effects respectively towards the fluorescence of S-DAB-G5-CdSe nanocomposite. The fluorescence enhancement provoked by Cd(II) can be linearized using a Henderson–Hasselbalch type equation and the quenching provoked by Pb(II) can be linearized by a Stern–Volmer equation. The sensor responds to Cd(II) ion in the 0.05–0.7 μM concentration range and to Pb(II) ion in the 0.01–0.15 mM concentration range with a LOD of 0.06 mM. The sensor has selectivity limitations but its dendrimer configuration has analytical advantages.
Keywords :
DAB dendrimer , Nanocomposite sensor , Thiolated DAB dendrimer , Cd(II) , Pb(II) , Cdse quantum dots
