Simple and rapid mercury ion selective electrode based on 1-undecanethiol assembled Au substrate and its recognition mechanism
| Autor: | Zhongliang Xiao, Liubin Song, Dan Chen, Hai-Qing Liang, Xiao Qing, Xian-Qing Li, Zhong Cao, Fu-Liang Wang |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
Surface Properties Inorganic chemistry chemistry.chemical_element Bioengineering 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences Ion selective electrode Biomaterials X-ray photoelectron spectroscopy Limit of Detection Monolayer Sulfhydryl Compounds Ions Aqueous solution Photoelectron Spectroscopy Reproducibility of Results Self-assembled monolayer Electrochemical Techniques Mercury Hydrogen-Ion Concentration 021001 nanoscience & nanotechnology 0104 chemical sciences Mercury (element) chemistry Mechanics of Materials Covalent bond Dielectric Spectroscopy Microscopy Electron Scanning Quantum Theory Gold 0210 nano-technology Ion-Selective Electrodes |
| Zdroj: | Materials scienceengineering. C, Materials for biological applications. 72 |
| ISSN: | 1873-0191 |
| Popis: | A simple and rapid mercury ion selective electrode based on 1-undecanethiol (1-UDT) assembled Au substrate (Au/1-UDT) has been well constructed. 1-UDT was for the purpose of generating self-assembled monolayer on gold surface to recognize Hg 2+ in aqueous solution, which had a working concentration range of 1.0 × 10 − 8 –1.0 × 10 − 4 mol L − 1 , with a Nernst response slope of 28.83 ± 0.4 mV/-pC, a detection limit of 4.5 × 10 − 9 mol L − 1 , and a good selectivity over the other tested cations. Also, the Au/1-UDT possessed good reproducibility, stability, and short response time. The recovery obtained for the determination of mercury ion in practical tremella samples was in the range of 99.8–103.4%. Combined electrochemical analysis and X-ray photoelectron spectroscopy (XPS) with quantum chemical computation, the probable recognition mechanism of the electrode for selective recognition of Hg 2+ has been investigated. The covalent bond formed between mercury and sulfur is stronger than the one between gold and sulfur and thus prevents the adsorption of 1-UDT molecules on the gold surface. The quantum chemical computation with density functional theory further demonstrates that the strong interaction between the mercury atom and the sulfur atom on the gold surface leads to the gold sulfur bond ruptured and the gold mercury metallophilic interaction. |
| Databáze: | OpenAIRE |
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