Spectroscopic Identification of Tri-n-octylphosphine Oxide (TOPO) Impurities and Elucidation of Their Roles in Cadmium Selenide Quantum-Wire Growth
| Autor: | Fudong Wang, Sean D. Dingman, William E. Buhro, Jeff L.-F. Kao, Rui Tang |
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| Rok vydání: | 2009 |
| Předmět: |
Magnetic Resonance Spectroscopy
Molecular Structure Cadmium selenide Nanowires Ligand Inorganic chemistry Oxide Phosphorus General Chemistry Ligands Phosphinic Acids Biochemistry Article Catalysis Solvent chemistry.chemical_compound Organophosphorus Compounds Colloid and Surface Chemistry chemistry Nanocrystal Impurity Cadmium Compounds Molecule Reactivity (chemistry) Selenium Compounds |
| Zdroj: | Journal of the American Chemical Society. 131:4983-4994 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja900191n |
| Popis: | Tri-n-octylphosphine oxide (TOPO) is the most commonly used solvent for the synthesis of colloidal nanocrystals. Here we show that the use of different batches of commercially obtained TOPO solvent introduces significant variability into the outcomes of CdSe quantum-wire syntheses. This irreproducibility is attributed to varying amounts of phosphorus-containing impurities in the different TOPO batches. We employ (31)P NMR to identify 10 of the common TOPO impurities. Their beneficial, harmful, or negligible effects on quantum-wire growth are determined. The impurity di-n-octylphosphinic acid (DOPA) is found to be the important beneficial TOPO impurity for the reproducible growth of high-quality CdSe quantum wires. DOPA is shown to beneficially modify precursor reactivity through ligand substitution. The other significant TOPO impurities are ranked according to their abilities to similarly influence precursor reactivity. The results are likely of general relevance to most nanocrystal syntheses conducted in TOPO. |
| Databáze: | OpenAIRE |
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