| 1 |
3413 |
3442 |
3422 |
3431 |
3431 |
In relation to GO, it increased with the increasing in PANI ratio; in relation to PAni spectrum, a decrease was observed |
Widening observed for PAni 50%/ GO 50% and band higher than others for PAni 75%/GO 25% |
- ν OH (GO) and ν NH (PAni/ DBSA), referring to hydrogen bond between NH from PAni and possible oxygenated group from GO, except hydroxyl (possibly carboxyl or epoxyde). The behavior of OH group can suggest electrostatic interaction. Furthermore, there is a possible overlap with humidity from KBr pad (Smith 1979Smith AL (1979) Applied infrared spectroscopy: fundamentals, techniques, and analytical problem-solving. New York: Wiley-Interscience.) |
| 2 |
1720 |
---- |
1727 |
1734 |
1717 |
Highest value for PAni 50%/ GO 50% |
The lowest intensity for PAni 50%/GO 50% |
νC=O in COOH from GO, which may pass to C=O similar to ester (Smith 1979Smith AL (1979) Applied infrared spectroscopy: fundamentals, techniques, and analytical problem-solving. New York: Wiley-Interscience.). Suggested changing on mode of electrostatic interaction. Possible action of DBSA (PAni dopant) |
|
|
|
|
|
|
|
The lowest value |
|
|
| 3 |
1630 |
----- |
1616 |
1641 |
1632 |
for PAni 25%/ GO75% and the highest for PAni 50%/GO 50% |
Intensity decreases, especially for PAni 50%/GO 50% |
π-π stacking, possibly masked to PAni 50%/GO 50% by KBr humidity |
| 4 |
---- |
1559 |
Shoulder at 1559 |
1564 |
Shoulder at 1556 |
No variation |
The highest value for PAni 50%/GO 50% |
Quinoid structure (N=Q=N) in aniline oligomers (Wang et al. 2009Wang H, Hao Q, Yang X, Lu L, Wang X (2009) Graphene oxide doped polyaniline for supercapacitors. Electrochem Comm 11(6):1158-1161. doi: 10.1016/j.elecom.2009.03.036
https://doi.org/10.1016/j.elecom.2009.03...
; Tang 1988)Tang J (1988) Infrared spectra of soluble polyaniline. Synthetic Met 24:231-238. doi: 10.1016/0379-6779(88)90261-5
https://doi.org/10.1016/0379-6779(88)902...
|
| 5 |
---- |
1481 |
Shoulder at 1465 |
1457 |
1457 |
Decrease |
It is visible for PAni 50%/GO 50% and PAni 75%/GO 25% |
π (C=C) in benzenoid ring (N-B-N) (Tang 1988Tang J (1988) Infrared spectra of soluble polyaniline. Synthetic Met 24:231-238. doi: 10.1016/0379-6779(88)90261-5
https://doi.org/10.1016/0379-6779(88)902...
; Dmitrieva and Dunsch 2011Dmitrieva E, Dunsch L (2011) How linear is "linear" polyaniline? J Phys Chem B 115(20):6401-6411. doi: 10.1021/jp200599f
https://doi.org/10.1021/jp200599f...
). Wang et al. (2009)Wang H, Hao Q, Yang X, Lu L, Wang X (2009) Graphene oxide doped polyaniline for supercapacitors. Electrochem Comm 11(6):1158-1161. doi: 10.1016/j.elecom.2009.03.036
https://doi.org/10.1016/j.elecom.2009.03...
suggest π-π stacking |
| 6 |
1385 |
--- |
1385 |
1384 |
1385 |
No variation |
Apparently, intensity decreased until maximize PAni ratio |
δ OH acid and δ OH phenol (GO) (Smith 1979Smith AL (1979) Applied infrared spectroscopy: fundamentals, techniques, and analytical problem-solving. New York: Wiley-Interscience.) |
| 7 |
--- |
1297 |
Shoulder at 1297 |
1296 |
1296 |
No changes |
The highest value for PAni 50%/ GO 50% |
υ C-N in QBcisQ, QBB, BBQ (Wang et al. 2009Wang H, Hao Q, Yang X, Lu L, Wang X (2009) Graphene oxide doped polyaniline for supercapacitors. Electrochem Comm 11(6):1158-1161. doi: 10.1016/j.elecom.2009.03.036
https://doi.org/10.1016/j.elecom.2009.03...
) and υ C-N secondary aromatic amine (Smith 1979Smith AL (1979) Applied infrared spectroscopy: fundamentals, techniques, and analytical problem-solving. New York: Wiley-Interscience.) |
| 8 |
---- |
1240 |
1232 |
1239 |
1234 |
The lowest value for PAni 25%/GO 75% |
Apparently, the highest value for PAni 50%/GO 50% |
n C-N in BBB (Wang et al. 2009Wang H, Hao Q, Yang X, Lu L, Wang X (2009) Graphene oxide doped polyaniline for supercapacitors. Electrochem Comm 11(6):1158-1161. doi: 10.1016/j.elecom.2009.03.036
https://doi.org/10.1016/j.elecom.2009.03...
). Probably performing on π-π stacking |
| 9 |
--- |
1122 |
1125 |
1108 |
1108 |
Decrease |
The highest intensity for PAni 50%/GO 50% |
1,170 - 1,140 cm-1 refers to vibrational mode Q=NH+-B or B-N+H-B (related to electrical conductivity). At 1,115 cm-1, substituting 1,2,4 of ring (Zeng and Ko 1998Zeng XR, Ko TM (1998) Structures and properties of chemically reduced polyanilines. Polymer 39(5):1187-1195. doi: 10.1016/s0032-3861(97)00381-9
https://doi.org/10.1016/s0032-3861(97)00...
; Tang 1988Tang J (1988) Infrared spectra of soluble polyaniline. Synthetic Met 24:231-238. doi: 10.1016/0379-6779(88)90261-5
https://doi.org/10.1016/0379-6779(88)902...
; Dmitrieva and Dunsch 2011Dmitrieva E, Dunsch L (2011) How linear is "linear" polyaniline? J Phys Chem B 115(20):6401-6411. doi: 10.1021/jp200599f
https://doi.org/10.1021/jp200599f...
). It can be related to π -π stacking and hydrogen bonds with oxygen groups from GO |
| 10 |
--- |
800 |
Shoulder at 800 |
798 |
797 |
No variation |
The highest value for PAni 50%/GO 50% |
Substituting 1,4 of ring (Wang et al. 2009Wang H, Hao Q, Yang X, Lu L, Wang X (2009) Graphene oxide doped polyaniline for supercapacitors. Electrochem Comm 11(6):1158-1161. doi: 10.1016/j.elecom.2009.03.036
https://doi.org/10.1016/j.elecom.2009.03...
and Smith 1979Smith AL (1979) Applied infrared spectroscopy: fundamentals, techniques, and analytical problem-solving. New York: Wiley-Interscience.) |
