title: Effects of multi-walled carbon nanotubes on the electrogenerated chemiluminescence and fluorescence of CdTe quantum dots.
abstract: Effects of multi-walled carbon nanotubes (CNTs) that were immobilized on glassy carbon electrode (GCE) on the electrogenerated chemiluminescence (ECL) of CdTe quantum dots (QDs) using tri-n-propylamine (TPrA) and 2-(dibutylamino)ethanol (DBAE) as the anodic coreactant are reported. Depending on the solution concentration of coreactant and QDs, the surface-confined CNTs could either quench or enhance the ECL intensity. Lowering the solution concentration of QDs was found to be beneficial for enhancing ECL. A V-shaped profile of ECL intensity ratio (at CNTs over bare GCE) versus coreactant concentration suggested that either low or high concentrations of coreactant were needed for effective ECL generation. The ECL quenching by CNTs was believed to follow the typical dynamic quenching mechanism, which was confirmed by fluorescent data that provided a Stern-Volmer and an estimated quenching constant of 11.7 g/L and 1.2 × 10(9) L/g•s, respectively, for the excited state CdTe* quenching by CNTs in solution. Furthermore, the ECL performance at CNTs was also affected by the type of the coreactant used, where up to 30 times enhancement in ECL was observed from the CdTe/DBAE system under the given experimental conditions. Graphical Abstract Illustration of anodic quantum dots ECL enhancement and quenching by multi-walled carbon nanotubes.
authors.affiliation: Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, Hattiesburg, MS, 39406, USA.
authors.forename: Yiliyasi
authors.initials: Y
authors.lastname: Wusimanjiang
authors.affiliation: Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, Hattiesburg, MS, 39406, USA.
authors.forename: Alexander
authors.initials: A
authors.lastname: Meyer
authors.affiliation: Key Laboratory of Beijing on Regional Air Pollution Control, College of Environmental and Energy Engineering, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing, 100124, China.
authors.forename: Liping
authors.initials: L
authors.lastname: Lu
authors.affiliation: Department of Chemistry and Biochemistry, The University of Southern Mississippi, 118 College Drive, Hattiesburg, MS, 39406, USA. wujian.miao@usm.edu.
authors.forename: Wujian
authors.initials: W
authors.lastname: Miao
keywords: Carbon nanotubes; CdTe quantum dots; Dynamic quenching; ECL coreactant; Electrogenerated chemiluminescence (ECL)