scholarly journals Synthesis and Characterisation of Fe-MW Carbon Nanotubes – Nanocrystalline NaY Zeolite

2018 ◽  
Author(s):  
Belkhiri Samir ◽  
Bhakta Arvind Kumar ◽  
Khimeche Kamel ◽  
Mekhalif Zineb ◽  
Delhalle Joseph
Keyword(s):  
Carbon Nanotubes ◽  
Nay Zeolite

Nitrogen Doping Effects on Microstructure of Multi-Walled Carbon Nanotubes

2014 ◽  
Vol 599-601 ◽  
pp. 88-91
Author(s):  
Nai Ci Bing ◽  
Yi Yong Zeng ◽  
Hao Gu ◽  
Ai Lun Wang ◽  
Li Jun Wang
Keyword(s):  
Carbon Nanotubes ◽  
Nitrogen Doping ◽  
Chemical Vapor ◽  
Chemical Vapor Deposition Method ◽  
Nay Zeolite ◽  
Doping Effects ◽  
Multi Walled Carbon Nanotubes ◽  
Nitrogen Doped Carbon ◽  
Walled Carbon Nanotubes ◽  
Compositional Properties

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.

Structural phenomena in the growth of carbon nanotubes

1993 ◽  
Vol 51 ◽  
pp. 750-751
Author(s):  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Carbonaceous Material ◽  
Cluster Growth ◽  
Structural Elements ◽  
Rich Variety ◽  
Different Shapes ◽  
Point To Point

HREM studies of the carbonaceous material deposited on the cathode of a Huffman-Krätschmer arc reactor have shown a rich variety of multiple-walled nano-clusters of different shapes and forms. The preparation of the samples, as well as the variety of cluster shapes, including triangular, rhombohedral and pentagonal projections, are described elsewhere.The close registry imposed on the nanotubes, focuses attention on the cluster growth mechanism. The strict parallelism in the graphitic separation of the tube walls is maintained through changes of form and size, often leading to 180° turns, and accommodating neighboring clusters and defects. Iijima et. al. have proposed a growth scheme in terms of pentagonal and heptagonal defects and their combinations in a hexagonal graphitic matrix, the first bending the surface inward, and the second outward. We report here HREM observations that support Iijima’s suggestions, and add some new features that refine the interpretation of the growth mechanism. The structural elements of our observations are briefly summarized in the following four micrographs, taken in a Hitachi H-8100 TEM operating at an accelerating voltage of 200 kV and with a point-to-point resolution of 0.20 nm.

Carbon nanotubes: Twist 'n' roll

Nature China ◽  
2007 ◽  
Author(s):  
Rachel Pei Chin Won
Keyword(s):  
Carbon Nanotubes
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