A method for obtaining high purity carbon nano-onions starting from nano-diamonds, comprising the steps of heating the nano- diamonds up to a first predetermined temperature of 1,200- 1,800°C in a protective helium atmosphere; maintaining said first temperature constant for a first predetermined time; and slowly cooling the carbon nano-onions; wherein the heating step i) is performed by means of at least two successive heating ramps, a first ramp in which the nano-diamonds are brought to a second predetermined temperature, greater than 1000°C, and are maintained at said second temperature for a second predetermined time, and a second ramp in which the mixture of nano-diamonds in the transformation step into carbon nano-onions is brought to the first temperature, then maintaining the first temperature constant for the first predetermined time.

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Silvia Giordani
Silvia Giordani
Full Professor Chair of Nanomaterials, Head of School of Chemical Sciences

My research interests are in the design, synthesis, and characterization of hybrid smart nanomaterials for biomedical, energy and environmental applications