Use of sulfur and selenium compounds as precursors to nanostructured materials
AssigneeThe Trustees of Columbia University in the City of New York
InventorsJonathan S. OWEN, Mark P. HENDRICKS, Michael P. CAMPOS
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Abstract
The presently disclosed subject matter provides processes for preparing nanocrystals, including processes for preparing core-shell nanocrystals. The presently disclosed subject matter also provides sulfur and selenium compounds as precursors to nanostructured materials. The presently disclosed subject matter also provides nanocrystals having a particular particle size distribution.
Claims29
A process for preparing nanocrystals, comprising contacting a metal salt with a precursor compound selected from the group consisting of sulfur compounds of Formulae (I)-(IV) and selenium compounds of Formulae (V) and (VI), wherein
- Formula (I) has the structure:
- wherein R1, R2, R3, and R4 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (II) has the structure:
- wherein R1 and R2 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (III) has the structure:
- wherein R1 and R2 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (IV) has the structure:
- wherein R1, R2, and R3 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (V) has the structure:
- wherein R1, R2, R3, and R4 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, and substituted and unsubstituted aryl;
- and X is selected from the group consisting of N, O, S, Se, and P;
- and wherein R2 is absent when X is O, S, or Se;
- and
- Formula (VI) has the structure:
- wherein R1, R2, R3, and R4 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl.
A process for preparing a core-shell nanocrystal, comprising contacting a core nanocrystal with a mixture comprising a metal salt and a precursor compound selected from the group consisting of sulfur compounds of Formulae (I)-(IV) and selenium compounds of Formulae (V) and (VI), wherein
- Formula (I) has the structure:
- wherein R1, R2, R3, and R4 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (II) has the structure:
- wherein R1 and R2 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (III) has the structure:
- wherein R1 and R2 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (IV) has the structure:
- wherein R1, R2, and R3 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl;
- Formula (V) has the structure:
- wherein R1, R2, R3, and R4 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted cycloalkenyl, and substituted and unsubstituted aryl;
- and X is selected from the group consisting of N, O, S, Se, and P;
- and wherein R2 is absent when X is O, S, or Se;
- and
- Formula (VI) has the structure:
- wherein R1, R2, R3, and R4 are independently selected from the group consisting of H, substituted or unsubstituted alkyl, substituted or unsubstituted cycloalkyl, substituted or unsubstituted alkenyl, substituted or unsubstituted cycloalkenyl, or substituted or unsubstituted aryl.
Nanocrystals comprising at least one semiconductor material selected from the group consisting of metal sulfides and metal selenides, wherein the nanocrystals have a narrow particle size distribution such that the standard deviation (σ) of the particle size distribution is less than or equal to 13% of the median particle size of the nanocrystals.
Dependencies are inferred from the claim text.