Table 1: Summary of FTIR measurements for the pristine and oxidized MWCNT-Ns.

Possible assignmentsWavenumber (cm−1)
MWCNT-NMWCNT-N
(H2O2)
MWCNT-N
(HNO3)
MWCNT-N
(KMnO4)

OH stretch3435345934283427
C–H stretch (CH2, CH3)2908, 28402977, 28882980, 28802978, 2888
C=O stretch (carboxyl or ketone)1705171817261710
Intermediate oxidized products—quinone groups165216371661, 16351641
C=C stretch1559156515801569
CH2/CH3 bending1460144314371440
Skeletal C–C tangential motions + C–O stretch12221219, 116711841190
C–O stretch10821083, 10521084, 10491087, 1046