Effect of nitrogen doping on Raman spectra of multi-walled carbon nanotubes

Taking Fe/NaY zeolite as catalysts, a range of nitrogen doped carbon nanotubes (N-CNTs) were synthesized by chemical vapor deposition method (CVD) at 1073K using ethanediamine, dimithylethanediamine and tetramethyl ethanediamine as nitrogen source and carbon source, respectively. The structural and compositional properties of N-CNTs were characterized by XRD, SEM and TEM. The results illustrate the microstructure of N-CNTs is strongly dependent on the N/C ratio of precursors. With the increase of N content in precursors, N-CNTs became shorter, more disorder, coarser surface and the average bamboo segment distance increased from 40 nm to 60 nm. A mechanism for the formation of the N-CNTs grown from three precursors with different N/C ratio has been proposed based on experimental observations.

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Nitrogen- and oxygen-doped multi-walled carbon nanotubes for supercapacitor with ionic liquid-based electrolyte

Functional Materials Letters ◽

10.1142/s1793604720400020 ◽

2020 ◽

Vol 13 (04) ◽

pp. 2040002

Author(s):

Ekaterina A. Arkhipova ◽

Alina S. Viktorova ◽

Anton S. Ivanov ◽

Konstantin I. Maslakov ◽

Roman Yu. Novotortsev

Keyword(s):

Carbon Nanotubes ◽

Cyclic Voltammetry ◽

Ionic Liquid ◽

Electronic Structure ◽

Nitrogen Doping ◽

Liquid Electrolyte ◽

Ionic Liquid Electrolyte ◽

Nitrogen Doped ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Nitrogen-doped multi-walled carbon nanotubes (CNTs) containing 2.2 at.% of nitrogen were produced by hydrothermal treatment of oxygen-doped CNTs with urea and tested as electrode material for the supercapacitor with ionic liquid electrolyte. Cyclic voltammetry measurements showed a beneficial effect of nitrogen doping on the capacitance behavior of CNTs resulted from both the changes in their electronic structure and improved interaction between the electrode surface and electrolyte ions. The specific capacitance of nitrogen-doped CNTs was 2.6 times higher than that of pristine ones.

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Appearance of radial breathing modes in Raman spectra of multi-walled carbon nanotubes upon laser illumination

Chemical Physics Letters ◽

10.1016/j.cplett.2008.02.057 ◽

2008 ◽

Vol 455 (1-3) ◽

pp. 83-87 ◽

Cited By ~ 10

Author(s):

Padmnabh Rai ◽

Dipti R. Mohapatra ◽

K.S. Hazra ◽

D.S. Misra ◽

Jay Ghatak ◽

...

Keyword(s):

Carbon Nanotubes ◽

Raman Spectra ◽

Laser Illumination ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Radial Breathing Modes

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Polyethylene Functionalized Multi-Walled Carbon Nanotubes via In Situ Polymerization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.573-574.1163 ◽

2012 ◽

Vol 573-574 ◽

pp. 1163-1166

Author(s):

Shi Yun Li ◽

De Sheng Hu

Keyword(s):

Mechanical Properties ◽

Carbon Nanotubes ◽

Storage Modulus ◽

Raman Spectra ◽

In Situ Polymerization ◽

Thermal And Mechanical Properties ◽

The Matrix ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

The MWNTs/PE nanocomposites are prepared by in situ polymerization with mulltiwalled carbon nanotubes (MWNTs) supported Cp2ZrCl2 catalyst and MAO as cocatalyst. The SEM and AFM results show that MWNTs are exfoliated and homogenously dispersed in PE matrix by the in situ polymerization. The up-shifting of the G band in Raman spectra show the strong compressive forces associated with PE chains on the MWNTs. The storage modulus of the MWNTs/PE nanocomposite can be increased by 160% even at low amount of MWNTs (0.2 wt %) due to MWNTs well-dispersed and exfoliated in the matrix. The TGA and DMA tests point to significant improvements on thermal and mechanical properties of the PE/MWNTs nanocomposites compared to pure PE.

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