title: Electrogenerated chemiluminescence from CdS nanotubes and its sensing application in aqueous solution.
abstract: 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 -0.9V (ECL-1) and -1.2V (ECL-2), respectively, when the potential was cycled between 0 and -1.6V. 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 S(2)O(8)(2-), H(2)O(2), and reduced dissolved oxygen led to the appearance of the ECL-2 peak. Based on the enhancing effect of H(2)O(2) on ECL-2 intensity, a novel CdS ECL sensor was developed for H(2)O(2) detection. The sensor exhibited a detection limit of 0.1muM and a linear range from 0.5muM to 0.01mM. The relative standard deviations of five replicate determinations of 5muM H(2)O(2) was 2.6%. In addition, the ECL spectrum in aqueous solution also exhibited two peaks at 500 and 640nm, respectively.
authors.affiliation: Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, PR China.
authors.forename: Gui-Fen
authors.initials: GF
authors.lastname: Jie
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Miao
authors.forename: Jun-Jie
authors.initials: JJ
authors.lastname: Zhu