Institut National De La Sante Et De La Recherche Medicale

Universitãt Stuttgart

Armines

Centre National De La Recherche Scientifique

Association Pour La Recherche Et Le Developpement De Methodes Et Processus Industriels “armines”

Inserm

Jean-Paul Boudou

Fedor Jelezko

Patrick Curmi

Alain Thorel

Mohamed Sennour

A method for manufacturing cubic diamond nanocrystals () comprising the following successive steps: (a) providing crystalline diamond powder where the maximum particle size of the powder is equal or more than 2 um and equal or less than 1 mm; (b) milling said crystalline micron diamond powder using nitrogen jet milling micronization so as to manufacture a fine powder; (c) nanomilling the fine powder of step b) using a planetary tungsten carbide ball mill; (d) acid treating the nanomilled powder of step c); (e) extracting the cubic diamond nanocrystals () by centrifugation. Advantageously round-shaped cubic diamond nanocrystals are manufactured.

Method for manufacturing cubic diamond nanocrystals

Method to produce diamonds containing Nitrogen-Vacancy centers from diamonds grown by a high pressure and high temperature process and containing isolated substitutional nitrogen, comprising: &#x2014;Irradiating () said diamonds by an electron beam such that the irradiation dose is comprised between 10and 10electrons per square centimeter; &#x2014;annealing () the irradiated diamonds in vacuum or in a inert atmosphere at a temperature above 700&#xb0; C. and for at least 1 hour; characterized in that said electron beam has an acceleration energy above 7 MeV.

Method to produce light-emitting nano-particles of diamond

Method to produce diamonds containing Nitrogen-Vacancy centers from diamonds grown by a high pressure and high temperature process and containing isolated substitutional nitrogen, comprising: &#x2014;Irradiating (12) said diamonds by an electron beam such that the irradiation dose is comprised between 10and 10electrons per square centimeter; &#x2014;annealing (14) the irradiated diamonds in vacuum or in a inert atmosphere at a temperature above 700&#xb0; C. and for at least 1 hour; characterized in that said electron beam has an acceleration energy above 7 MeV.

Growing community of inventors

Chaville, France

Jean-Paul Boudou