Table 1. Elemental analysis data of as-prepared diamond-based materials.

Sample	N [wt.%]	C [wt.%]	H [wt.%]	O [wt.%]
D@Graphite	—	99.25	0.164	0.466
D@GO	—	64.57	1.74	32.77
D@GO-COOH	—	65.33	1.97	32.49
D@GO-COOH@(PEI/PAA)8	5.74	54.72	5.53	34.02