Patent ID: 8932554
Filing Date: 2015-01-13
Classification: C01B,C09K,C30B,Y10S,Y10T

Abstract:
1. A powder of diamonds containing Nitrogen-Vacancy centres comprising nano-particles of diamonds having a size comprised between 15 and 20 nanometers manufactured by the method comprising irradiating diamonds having a size above 0.1 micrometers grown by a high pressure and high temperature process and containing isolated substitutional nitrogen by an electron beam such that the irradiation dose is comprised between 10 annealing the irradiated diamonds in vacuum or in an inert atmosphere at a temperature above 700° C. and for at least 1 hour; after annealing, grinding said diamonds to nano-particles of diamonds having a size of less than 20 nanometers; wherein each diamond contains 4 to 16 Nitrogen-Vacancy centres in a 20-nanometer particle or 10 Nitrogen-Vacancy centres in a 10-nanometer particle or 8 Nitrogen-Vacancy centres in a 15-nanometer particle.