In situ spectroscopic characterization of a solution-phase X-type ligand exchange at colloidal lead sulphide quantum dot surfaces
| Autor: | Chloe V. Castaneda, Nicholas C. Anderson, Matthew C. Beard, Arthur J. Nozik, Daniel M. Kroupa |
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| Rok vydání: | 2016 |
| Předmět: |
In situ
Chemistry Ligand Metals and Alloys Analytical chemistry 02 engineering and technology General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Catalysis 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Characterization (materials science) Absorbance Colloid Quantum dot Materials Chemistry Ceramics and Composites Titration 0210 nano-technology Spectroscopy |
| Zdroj: | Chemical communications (Cambridge, England). 52(96) |
| ISSN: | 1364-548X |
| Popis: | We employed quantitative NMR spectroscopy and spectrophotometric absorbance titration to study a quantum dot X-type ligand exchange reaction. We find that the exchange is highly cooperative, where at low extents of exchange the change in free energy of the reaction, ΔGXC, is ∼11 kJ mol−1 while at higher extents of exchange ΔGXC saturates to ∼−4 kJ mol−1. A modified Fowler binding isotherm is developed to describe the reaction. |
| Databáze: | OpenAIRE |
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