Figure 3
From: High-yield fabrication and properties of 1.4 nm nanodiamonds with narrow size distribution

Model of DND size reduction.
Schematic model showing only partial disintegration of a DND core agglutinate after sonication of the as-received DNDs. Prior application of air annealing at 520 °C for 25 min leads to enhanced disruption of the agglutinate as well as size decrease below 2 nm.