Electrochemical detection of Cd ions by a self-assembled monolayer of 1,9-nonanedithiol on gold |
| |
Authors: | Esteban Malel Izabella Zawisza Daniel Mandler |
| |
Affiliation: | a The Hebrew University of Jerusalem, Department of Inorganic and Analytical Chemistry, Jerusalem 91904, Israel b University of Oldenburg, Faculty for Mathematics and Natural Sciences, Center of Interface Science (CIS), Department of Pure and Applied Chemistry and Institute of Chemistry and Biology of the Marine Environment (ICBM), Germany |
| |
Abstract: | The application of 1,9-nonanedithiol (NDT) self-assembled monolayer (SAM) on gold for the electrochemical determination of Cd2+ was studied. Interestingly, we found that a NDT SAM strongly affects the stripping wave of Cd, resulting in a sharp peak that was used for electroanalytical determination of Cd2+ in aqueous solutions. The different parameters, such as potential and time of deposition of Cd, were examined. Furthermore, polarization-modulated infrared reflection absorption spectroscopy (PM IRRAS) and X-ray photoelectron spectroscopy (XPS) were used for exploring the interaction between the deposited Cd and the thiol groups on Au. FTIR measurements clearly indicate that NDT is assembled in a disordered liquid type monolayer interacting with the Au electrode via both thiol moieties. XPS reveals that Cd is stripped at two different potentials and that the signal of sulfur is almost unchanged by deposition and desorption of Cd. All these finding allude to the interesting conclusion that Cd is deposited on Au lifting to some extent the thiol groups. |
| |
Keywords: | Cd2+ determination Self-assembled monolayer Preconcentration Cyclic voltammetry X-ray photoelectron spectroscopy Infrared reflection absorption spectroscopy |
本文献已被 ScienceDirect 等数据库收录! |
|