Evaluation of quantum dots applied as switchable layer in a light-controlled electrochemical sensor |
| |
Authors: | Zhao Yue Waqas Khalid Marco Zanella Azhar Zahoor Abbasi Andrea Pfreundt Pilar Rivera Gil Kirsten Schubert Fred Lisdat Wolfgang J. Parak |
| |
Affiliation: | 1. Department of Physics, Philipps University Marburg, 35037, Marburg, Germany 2. Department of Electronics, Nankai University, 300071, Tianjin, China 3. Biosystems Technology, University of Applied Sciences Wildau, 1574, Wildau, Germany 4. Wissenschaftliches Zentrum für Materialwissenschaften, Philipps University Marburg, 35037, Marburg, Germany
|
| |
Abstract: | Gold electrodes with switchable conductance are created by coating the gold surface with different colloidal quantum dots. For the quantum dot immobilization, a dithiol compound was used. By polarizing the electrode and applying a light pointer, local photocurrents were generated. The performance of this setup was characterized for a variety of different nanoparticle materials regarding drift and signal-to-noise ratio. We varied the following parameters: quantum dot materials and immobilization protocol. The results indicate that the performance of the sensor strongly depends on how the quantum dots are bound to the gold electrode. The best results were obtained by inclusion of an additional polyelectrolyte film, which had been fabricated using layer-by-layer assembly. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|