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. 2023 Nov 7;9(11):e21824. doi: 10.1016/j.heliyon.2023.e21824

Table 1.

FTIR peaks and functional groups present on precousor and synthesized carbon dots.

Sr. No Name of Compound Functional Group Frequency
1. Citric Acid A. O–H stretching vibration 3283 & 3493
B. C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching vibration 1741
C. C–OH stretching vibration 1138
D. CH2 rocking 769
2. PBA A. O–H stretching vibration 3139
B. B–O stretching vibration 1322
C. C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching vibration 1677
D. CH2 bending vibration 1262, 1188
3. Raw Chitosan A. O–H & N–H stretching vibration 3327
B. C–H stretching vibration 2875
C. NH2 bending vibration 1648 & 1568
D. C Created by potrace 1.16, written by Peter Selinger 2001-2019 C, C Created by potrace 1.16, written by Peter Selinger 2001-2019 N and C Created by potrace 1.16, written by Peter Selinger 2001-2019 C–O stretching 1375–1148
E. CH2 bending vibrations 1024–900
4. Raw PEI 2kd A. N–H stretching vibration 3300
B. C–H stretching vibration 2842 & 2946
C. NH2 bending vibration 1603
D. CH2 bending vibration 1464
E. C–N stretching vibration 1107
5. Raw PEI 25 kd A. N–H stretching vibration 3294
B. C–H stretching vibration 2811 & 2935
C. NH2 bending vibration 1594
D. CH2 bending vibration 1454
E. C–N stretching vibration 1107
6. CS-CDs A. O–H and N–H stretching vibration 3378
B. C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching vibration 1727
C. C Created by potrace 1.16, written by Peter Selinger 2001-2019 C stretching vibration 1638, 1071
D. NH2 bending vibration 1506
E. C–O stretching vibration 1071
F. CH2 bending vibration 1014
7. PEI2-CDs A. O–H and N–H stretching vibration 3335
B. C–H stretching vibration 2921
C. C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching vibration 1700
D. C Created by potrace 1.16, written by Peter Selinger 2001-2019 C stretching vibration 1642
E. CH2 bending vibration 1430
F. C–O stretching vibration 1071
8. PEI25-CDs A. O–H and N–H stretching vibration 3348
B. C–H stretching vibration 2969
C. C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching vibration 1705
D. C Created by potrace 1.16, written by Peter Selinger 2001-2019 C stretching vibration 1637
E. CH2 bending vibration 1456
F. C–O stretching vibration 1055
9 CP2-CDs A. O–H and N–H stretching vibration 3348
B. C–H stretching vibration 2969
C. C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching vibration 1714
D. C Created by potrace 1.16, written by Peter Selinger 2001-2019 C stretching vibration 1617, 1064
E. NH2 bending vibration 1507
F. C–N stretching vibration 1194
G. C–O stretching vibration 1064
10. CP25-CDs A. O–H and N–H stretching vibration 3365
B. C–H stretching vibration 2929
C. C Created by potrace 1.16, written by Peter Selinger 2001-2019 O stretching vibration 1727
D. C Created by potrace 1.16, written by Peter Selinger 2001-2019 C stretching vibration 1617, 1067
E. NH2 bending vibration 1511
F. C–N stretching vibration 1182
G. C–O stretching vibration 1067