Journal
CHEMISTRY OF MATERIALS
Volume 28, Issue 1, Pages 227-233Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.5b03914
Keywords
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Funding
- National Science Foundation [NSF-CHE-1151172]
- Department of Energy [DE-SC0006410]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1151172] Funding Source: National Science Foundation
- U.S. Department of Energy (DOE) [DE-SC0006410] Funding Source: U.S. Department of Energy (DOE)
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We report the synthesis of cadmium telluride nanocrystals from cadmium bis(phenyltellurolate) (Cd(TePh)(2)) and cadmium alkylcarboxylates (Cd(O2CR)(2), O2CR = oleate, tetradecanoate). Cd(TePh)(2) reacts quantitatively with Cd(O2CR)(2) at 220 degrees C over 1 h with the concomitant elimination of diphenyl telluride (Ph2Te) and CdTe nanocrystals. The nanocrystal diameter approaches 3.0-3.2 nm at full conversion regardless of changes to the solvent, carboxylate chain length, heating conditions, and reaction concentration. Larger nanocrystals may be grown by slow addition of additional precursors to the crude product mixture. Isolated nanocrystals have carboxylate ligands (2.1-4.7 nm(-2)) that can be displaced along with excess cadmium ions using low concentrations of N,N,N',N'-tetramethylethylenediamine (TMEDA) (1.5-280 mM). Using H-1 NMR spectroscopy, we measure the extent of the displacement and show that the binding of Cd(O2CR)(2) to CdTe is weaker than to CdSe nanocrystals of similar size. The weaker binding is proposed to arise from a lower polarity and greater stability of reconstructed CdTe surfaces.
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