Table 1.

FTIR peak positions of various functional groups before and after composite formation.

Functional groups	IR peak positions (cm−1)
	CS	CSP	HAp particles	HAp/CSP
PO4 3−	—	—	1092, 1030, 604	1079, 1025, 602
P–OH	—	1088, 1047, 991, 493	—	1070, disappeared, 984, disappeared
O–H bending	—	—	632, 3571	625, 3563
O–H stretching	3430	3427	3422	3402
N–H	3467, 1622, 1544	3465, 1620, 1544	—	3462, 1620, 1543