Wavelength (cm⁻¹)	Unmodified CAC	nZnO-CAC	nZnO-STAC	Characteristic Vibration
3425 - 3429	Very strong	Very strong	Very strong	OH stretching (Al-Qodah & Shawabkah, 2009)
2070 - 2071	Medium	Medium	Medium	Aromatic C=C stretching N=C=S stretching (Özçimen & Ersoy Meriçboyu, 2010)
1617	Strong	Strong	Strong	Aromatic C=C stretching (Özçimen & Ersoy Meriçboyu, 2010)
1330 - 1430	Medium	Medium	Medium	Aldehyde OH bending (in plane) (Thangeeswari et al., 2017)
1100 - 1110	Medium	Medium	Medium	C-C-C bending Amine C-N stretching (Özçimen & Ersoy Meriçboyu, 2010)
602 - 605	Weak	Weak	Weak	Halo-compound C-Br stretching C-H deformation (Al-Qodah & Shawabkah, 2009)
464 - 468	No peak	Medium	Medium	ZnO stretching (Thangeeswari et al., 2017)