Département de chimie moléculaire

After binding with TiO2 nanoparticles, stable and reproducible electrochemiluminescence (ECL) emission can be generated from CdTe quantum dots (QDs) in H2O2 aq. solns. In this process, some indispensable information was revealed: (1) electrons are easily injected into the CdTe-QDs conduction band (CB) at a controlled potential in the electrochem. process; (2) the transfer of electron in the CdTe-QDs CB into TiO2 CB yields TiO2(e-) species, which react with H2O2 to produce OH*, a key intermediate to enhance QD ECL intensity in aq. soln.; (3) the transfer of electrons from reduced QDs to TiO2 is helpful to improve QD recovery efficiency, which also benefits the enhanced and stable light emitting in the ECL process. Thus, the enhanced ECL based on the above discovery gives the possibility to develop ultrasensitive bioassay methods and widen the application of semiconductor QD ECL in anal. chem. [on SciFinder(R)]