期刊
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
卷 408, 期 25, 页码 7049-7057出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-016-9573-1
关键词
Electrogenerated chemiluminescence (ECL); Carbon nanotubes; CdTe quantum dots; Dynamic quenching; ECL coreactant
资金
- National Science Foundation via an NSF CAREER award [CHE 0955878]
- National Natural Science Foundation of China [21475006]
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 x 10(9) L/gaEuro cent 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.
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