Germanium-doped and germanium/nitrogen-codoped carbon nanotubes with highly enhanced activity for oxygen reduction in alkaline medium

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72676-72680 ◽  
Author(s):  
Fang Wang ◽  
Ziwu Liu ◽  
Meng Li ◽  
Quan-De Wang
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Oxygen Reduction ◽  
Alkaline Medium ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Enhanced Activity

Novel Ge-doped and Ge/N-codoped carbon nanotubes were prepared by chemical vapor deposition. Results indicate that the as-prepared Ge-containing carbon nanotubes exhibited superior activities and durability for O2 reduction in alkaline medium.

Cobalt supported on carbon nanotubes for methane chemical vapor deposition towards carbon nanotubes

2021 ◽  
Author(s):  
Laura Esteves ◽  
Hugo Alvarenga Oliveira ◽  
Y. T. Xing ◽  
Fabio Barboza Passos
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Heterogeneous Catalysis ◽  
Vapor Deposition ◽  
Supported Catalysts ◽  
Chemical Vapor

Carbon nanotubes (CNT) application in heterogeneous catalysis has been attracting growing interest. However, the use of CNT-supported catalysts in the chemical vapor deposition for the production of new CNT is...

Fabrication of short and straight carbon nanotubes by chemical vapor deposition

2008 ◽  
Vol 476 (1-2) ◽  
pp. 230-233 ◽  
Author(s):  
Haipeng Li ◽  
Naiqin Zhao ◽  
Chunnian He ◽  
Chunsheng Shi ◽  
Xiwen Du ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor

The Effect of Catalyst on Carbon Nanotubes (CNTs) Synthesized by Catalytic Chemical Vapor Deposition (CVD) Technique

2011 ◽  
Vol 364 ◽  
pp. 232-237 ◽  
Author(s):  
S.Y. Lim ◽  
M.M. Norani
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Vapor Deposition ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Dry Etching ◽  
Wet Etching ◽  
Etching Time ◽  
Catalytic Chemical Vapor Deposition ◽  
Catalyst Pretreatment ◽  
Diameter Range

Catalyst plays a crucial role in determining the characteristics of carbon nanotubes (CNTs) produced by using thermal catalytic chemical vapor deposition (CVD). It is essential to investigate how the catalyst preparation affects the characteristics of CNTs because certain application demands specific size for optimum performance. This study reports the effect of the types of catalyst and the duration of the catalyst pre-treatment (wet etching time, dry etching time and ball milling) on the diameter of CNTs. The synthesized CNTs samples were characterized by scanning and transmission electron microscopy and Raman spectroscopy. Wet etching (2M hydrofluoric acid) time was varied from 1 to 2.5 hrs and the diameter range was found to be in the range of 23 to 52 nm. The diameter range for CNTs produced for 3 hrs and 5 hrs of dry etching treatment (with ammonia gas) are 38 to 51 nm and 23 to 48 nm, respectively. The diameter size of CNTs produced using Ni (14 to 25 nm) was found to be smaller than Fe (38 to 51 nm). There is a significant decrease in the diameter of CNTs by prolonging the wet etching period. Shorter and curly shaped CNTs can also be obtained by using Ni as the catalyst. Keywords: chemical vapor deposition, carbon nanotubes, catalyst pretreatment

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