Skip to main content
. 2023 May 2;14:2507. doi: 10.1038/s41467-023-38178-1

Fig. 6. The stability of the fabricated diamond-based PUF labels.

Fig. 6

a The optical microscopy images of the same area on the diamond-PUF before and after a series of extreme treatments: (1) incubated in 1 M NaOH for 24 h; (2) incubated in 1 M HCl for 24 h; (3) milled with NaCl particles and incubated in supersaturated NaCl for 24 h, then washed with water under sonication (1 h); (4) heated at 400 °C for 24 h; and (5) exposed to ultraviolet (UV) light for 2 h. b The pairwise match of ten diamond-PUF labels before and after the treatments. The x-axis and the y-axis represent the first and the second measurement of the labels, respectively, and the color bar shows the similarity index. c The distribution of Hamming distances (normalized) of the keys generated from the ten diamond-PUF labels before and after the treatments. d The confocal fluorescence images of the same area on a diamond-PUF chip before and after a series of extreme treatments. e The photostability test (2 h) of the SiV centers in a diamond microparticle.