Figure 4
From: High-yield fabrication and properties of 1.4 nm nanodiamonds with narrow size distribution

Raman spectra of the size reduced DNDs.
Raman spectra of as-received DNDs (black) and the annealed DNDs at 520 °C for 10 min (red), 25 min (green), 50 min (blue), 75 min (cyan), and 100 min (magenta).