| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 866370 | Biosensors and Bioelectronics | 2015 | 7 Pages |
•Au NDs was electrodeposited on the ITO electrode for construction of ECL DNA sensor.•Ag/ZnO coupled structures was prepared to catalyze the reduction of H2O2, the ECL coreactant.•A signal-off ECL sensor for detection of Pb2+ was successfully constructed.
A signal-off electrochemiluminescence (ECL) DNA sensor based on gold nanodendrites (Au NDs) modified indium tin oxide (ITO) electrode for the detection of lead ion (Pb2+) was developed. Well-defined Au NDs were prepared on ITO electrode using low-potential synthesis, assisted by ethylenediamine. Based on Pb2+-specific deoxyribozyme, the silver/zinc oxide (Ag/ZnO) with coupled structure, prepared by one-pot method, was close to the surface of the electrode to catalyze the reduction of part of H2O2, the coreactant for cathodic ECL emission, leading to a decrease of ECL intensity. In addition, taking advantage of the larger surface area to capture a large amount of capture probe as well as excellent conductivity of Au NDs, the sensor could detect Pb2+ quantitatively in a wider range, and performed excellent selectivity. Furthermore, such simple and sensitive DNA sensor was successfully applied for the detection of Pb2+ in lake water and human serum samples, respectively.
