PMID- 17654947
OWN - NLM
STAT- MEDLINE
DCOM- 20070907
LR  - 20190715
IS  - 1533-4880 (Print)
IS  - 1533-4880 (Linking)
VI  - 7
IP  - 6
DP  - 2007 Jun
TI  - FTIR spectroscopy of multiwalled carbon nanotubes: a simple approach to study the 
      nitrogen doping.
PG  - 1820-3
AB  - The nitrogen doped multiwalled carbon nanotubes (MWNTs) were synthesized by 
      microwave plasma chemical vapor deposition (MPCVD) technique. In this paper, we 
      report the results of FTIR, Raman, and TGA studies to confirm the presence of 
      N-doping inside carbon nanotubes. Fourier transform infrared (FTIR) studies were 
      carried out in the range 400-4000 cm(-1) to study the attachment of nitrogen 
      impurities on carbon nanotubes. FTIR spectra of the virgin sample of MWNTs show 
      dominant peaks which are corresponding to Si-O, C-N, N-CH3, CNT, C-O, and C-Hx, 
      respectively. The Si-O peak has its origin in silicon substrate whereas the other 
      peaks are due to the precursor gases present in the gas mixture. The peaks are 
      sharp and highly intense showing the chemisorption nature of the dipole bond. The 
      intensity of the peaks due to N-CH3, C-N, and C-H reduces after annealing. It is 
      interesting to note that these peaks vanish on annealing at high temperature (900 
      degrees C). The presence of C-N peak may imply the doping of the MWNTs with N in 
      substitution mode. The position of this intense peak is in agreement with the 
      reported peak in carbon nitride samples prepared by plasma CVD process, since the 
      Raman modes are also expected to be delocalized over both carbon and nitrogen 
      sites it was found that the intensity ratio of the D and G peaks, I(D)/I(G), 
      varies as a function of ammonia concentration. The TGA measurements, carried out 
      under argon flow, show that the dominant weight loss of the sample occurs in the 
      temperature range 400-600 degrees C corresponding to the removal of the 
      impurities and amorphous carbon.
FAU - Misra, Abha
AU  - Misra A
AD  - Department of Physics, Indian Institute of Technology Bombay, Mumbai 400076, 
      India.
FAU - Tyagi, Pawan K
AU  - Tyagi PK
FAU - Rai, Padmnabh
AU  - Rai P
FAU - Misra, D S
AU  - Misra DS
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Nanosci Nanotechnol
JT  - Journal of nanoscience and nanotechnology
JID - 101088195
RN  - 0 (Macromolecular Substances)
RN  - 0 (Nanotubes, Carbon)
RN  - N762921K75 (Nitrogen)
SB  - IM
MH  - Crystallization/*methods
MH  - Macromolecular Substances/chemistry
MH  - Materials Testing
MH  - Molecular Conformation
MH  - Nanotechnology/*methods
MH  - Nanotubes, Carbon/*chemistry/*ultrastructure
MH  - Nitrogen/*chemistry
MH  - Particle Size
MH  - Spectroscopy, Fourier Transform Infrared/*methods
MH  - Surface Properties
EDAT- 2007/07/28 09:00
MHDA- 2007/09/08 09:00
CRDT- 2007/07/28 09:00
PHST- 2007/07/28 09:00 [pubmed]
PHST- 2007/09/08 09:00 [medline]
PHST- 2007/07/28 09:00 [entrez]
AID - 10.1166/jnn.2007.723 [doi]
PST - ppublish
SO  - J Nanosci Nanotechnol. 2007 Jun;7(6):1820-3. doi: 10.1166/jnn.2007.723.