| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1245150 | Talanta | 2007 | 5 Pages |
Electrogenerated chemiluminescence (ECL) of CdS nanotubes in aqueous solution and its sensing application were studied by entrapping the CdS nanotubes in carbon paste electrode. Two ECL peaks were observed at −0.9 V (ECL-1) and −1.2 V (ECL-2), respectively, when the potential was cycled between 0 and −1.6 V. The electrochemically reduced nanocrystal species of CdS nanotubes could collide with the oxidized species in an annihilation process to produce the peak of ECL-1. The electron-transfer reaction between the reduced CdS nanocrystal species and oxidant coreactants such as S2O82−, H2O2, and reduced dissolved oxygen led to the appearance of the ECL-2 peak. Based on the enhancing effect of H2O2 on ECL-2 intensity, a novel CdS ECL sensor was developed for H2O2 detection. The sensor exhibited a detection limit of 0.1 μM and a linear range from 0.5 μM to 0.01 mM. The relative standard deviations of five replicate determinations of 5 μM H2O2 was 2.6%. In addition, the ECL spectrum in aqueous solution also exhibited two peaks at 500 and 640 nm, respectively.
