Département de chimie moléculaire

Electrochemiluminescence (ECL) of TiO2 nanocrystals with different crystal styles modified fluorine-doped tin oxide (FTO) electrode was investigated in H2O2 soln. The amorphous TiO2 nanospheres were facilely synthesized by the hydrothermal and condensation method. Crystal TiO2, namely anatase and rutile, were prepd. by calcination of the amorphous TiO2 nanospheres at 450 and 800 °C, resp. The transmission electron microscope (TEM) and electron diffraction pattern were used to characterize the obtained TiO2 nanoparticles morphol. and the corresponding crystal styles. The electrochem. and ECL behaviors were investigated by cyclic voltammetry. The ECL quenching was obsd. by introduction of gold nanoparticles. Based on the quenching effect, a sensitive glucose ECL biosensor as a model was fabricated by in-situ growing-up gold seeds in AuCl4- soln. induced by biol. generated H2O2. The linear range to detect glucose is from 5.0×10-7 M to 4.0×10-3 M with the limit of detection of 2.5×10-7 M. [on SciFinder(R)]