Table 7.

Chemical composition ratios for C 1s, O 1s, and N 1s for the CdS QD–chitosan–GO thin film before and after contact with Co²⁺.

Sample	Element	Corrected RSF	Sub-Peak	Area	Corrected Area	Ratio (%)
CdS QD–chitosan–GO before contact with Co2+	C	1.2070	C–C	6594.5	5463.5	46.45
			C–O, C–O–C	5438.9	4506.1	38.31
			C=O, O–C=O	2163.6	1792.5	15.24
	O	3.1048	O–C, C–O–C	10,782.7	3472.9	69.57
			O=C	4716.3	1519.0	30.43
	N	2.0520	Amine	515.9	251.4	70.01
			C–N	221.1	107.7	29.91
CdS QD–chitosan–GO after contact with Co2+	C	1.2070	C–C	7542.7	6249.1	44.56
			C–O, C–O–C	7332.8	6075.2	43.32
			C=O, O–C=O	2051.6	1699.8	12.12
	O	3.1048	O–C, C–O–C	14,528.3	4679.3	73.29
			O=C	5294.7	1705.3	26.71
	N	2.0520	Amine	935.1	455.7	67.32
			C–N	453.9	221.2	32.68