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US 2025/0215313 A1Published application
Heat treatment of nanodiamond particles with controlled powder layer depth
AssigneeSchlumberger Technology Corporation
InventorYahua BAO
Life of this patent
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Abstract
Luminescent diamond is made by creating vacancies in diamond grains and heat treating the diamond grains by controlling a thickness of the diamond grains on a substrate. The heat treatment may occur in a temperature range that does not burn the diamond grains, and the controlled thickness produces an even color change and/or promotes oxygen terminations on the diamond particle surfaces.
Claims20
A method of making luminescent diamond comprising:
- subjecting a volume of precursor diamond grains to high-pressure/high-temperature conditions in a pressure cell and thereby forming diamond grains with luminescent centers;
- forming a suspension by suspending the diamond grains in a liquid;
- adhering the suspension to a substrate and controlling a thickness of the suspension on the substrate;
- and
- heat treating the suspension on the substrate, and thereby changing at least one of a color of the suspension or oxygen terminations on diamond particles of the suspension.
2 more elements
Dependencies are inferred from the claim text.