TABLE 2.

Major FTIR assignments of the CuNPs synthesized by H. rhamnoides.

Wavenumber (cm-1)	Functional group	Band in the earlier study (cm-1)	References
610	Cu-O (strong)	669, 480	Ghosh et al. (2020)
1,062	C-O (medium)	1,046	Ghosh et al. (2020)
1,392	C=C	–	Mohamed et al. (2022)
1,638	C≡N/OH	1,589	Ghosh et al. (2020)
2,297	C-H	2,980	Ghosh et al. (2020)
2,914	O-H (broad)	–	Wu et al. (2020)
3,449	OH	3,380	Ghosh et al. (2020)