期刊
CHEMISTRY OF MATERIALS
卷 31, 期 12, 页码 4619-4624出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b02019
关键词
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资金
- NSF [EPS-1004083, CHE-1905265]
- Vanderbilt Institute of Nanoscale Science and Engineering
- Mitchum E. Warren Fellowship
Herein, we report the unprecedented direct synthesis of a recently discovered metastable wurtzite phase of Cu2-xSe. Nanocrystals of Cu, Se were synthesized employing dodecyl diselenide as the selenium source and ligand. Optical characterization performed with UV vis NIR spectroscopy in solution showed a broad plasmonic band in the NIR Structural characterization was performed with X-ray diffraction (XRD) and transmission electron microscopy. Variable-temperature XRD analysis revealed that the wurtzite nanocrystals irreversibly transform into the thermodynamic cubic phase at 151 degrees C. Replacement of dodecyl diselenide with dodecyl selenol yielded cubic phase Cu(2-)xSe, allowing for polymorphic phase control. An aliquot study was performed to gain insight into the mechanism of phase selectivity. The direct synthesis of this novel wurtzite phase could enable the discovery of new phenomena and expand the vast application space of CuxSey compounds.
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