Potassium Doping in the Double-Walled Carbon Nanotubes at Room Temperature

2008 ◽  
Vol 112 (12) ◽  
pp. 4492-4497 ◽  
Author(s):  
Kyoung-Yong Chun ◽  
Cheol Jin Lee
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Defect-driven room-temperature coalescence of double-walled carbon nanotubes

2010 ◽  
Vol 21 (24) ◽  
pp. 245302 ◽  
Author(s):  
Anmin Nie ◽  
Peng Wang ◽  
Hongtao Wang ◽  
Scott X Mao
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Far Infrared Characterization of Single and Double Walled Carbon Nanotubes

2011 ◽  
Vol 1284 ◽  
Author(s):  
S. G. Chou ◽  
Z. Ahmed ◽  
G.G. Samsonidze ◽  
J. Kong ◽  
M. S. Dresselhaus ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Low Frequency ◽  
Far Infrared ◽  
Diameter Distribution ◽  
Thermal Excitation ◽  
Polyethylene Matrix ◽  
Swcnt Sample ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

ABSTRACTHigh resolution far infrared absorption measurements were carried out for single walled and double walled carbon nanotubes samples (SWCNT and DWCNT) encased in a polyethylene matrix to investigate the temperature and bundling effects on the low frequency phonons associated with the low frequency circumferential vibrations. At a temperature where kBT is significantly lower than the phonon energy, the broad absorption features as observed at room temperature become well resolved phonon transitions. For a DWCNT sample whose inner tubes have a similar diameter distribution as the SWCNT sample studied, a series of sharp features were observed at room temperature at similar positions as for the SWCNT samples studied. The narrow linewidth is attributed to the fact that the inner tubes are isolated from the polyethylene matrix and the weak inter-tubule interactions. More systematic studies will be required to better understand the effects of inhomogeneous broadening and thermal-excitation on the detailed position and lineshape of the low frequency phonon features in carbon nanotubes.

scholarly journals A Facile and Efficient Bromination of Multi-Walled Carbon Nanotubes

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3161
Author(s):  
Sandra Zarska ◽  
Damian Kulawik ◽  
Volodymyr Pavlyuk ◽  
Piotr Tomasik ◽  
Alicja Bachmatiuk ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Room Temperature ◽  
Covalent Attachment ◽  
Closed Vessel ◽  
Dangling Bonds ◽  
Magnetic Stirrer ◽  
Defect Sites ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Covalently Bound

The bromination of multi-walled carbon nanotubes (MWCNT) was performed with vapor bromine in a closed vessel, and they were subjected to intensive stirring with a magnetic stirrer for up to 14 days. The efficiency of bromination was compared depending upon duration. The structure and surface of the crude and purified products were characterized by detailed physicochemical analyses, such as SEM/EDS, TEM, XRD, TGA, Raman, and XPS spectroscopies. The studies confirmed the presence of bromine covalently bound with nanotubes as well as the formation of inclusion MWCNT–Br2 complexes. It was confirmed that Br2 molecules are absorbed on the surface of nanotubes (forming the CNT-Br2 complex), while they can dissociate close to dangling bonds at CNT defect sites with the formation of covalent C−Br bonds. Thus, any covalent attachment of bromine to the graphitic surface achieved around room temperature is likely related to the defects in the MWCNTs. The best results, i.e., the highest amount of attached Br2, were obtained for brominated nanotubes brominated for 10 days, with the content of covalently bound bromine being 0.68 at% (by XPS).

Double-walled carbon nanotubes synthesized using carbon black as the dot carbon source

2006 ◽  
Vol 17 (13) ◽  
pp. 3100-3104 ◽  
Author(s):  
Zhi-Gang Chen ◽  
Feng Li ◽  
Wen-Cai Ren ◽  
Hongtao Cong ◽  
Chang Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Carbon Source ◽  
Carbon Black ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Covalent decoration onto the outer walls of double walled carbon nanotubes with perylenediimides

2015 ◽  
Vol 3 (19) ◽  
pp. 4960-4969 ◽  
Author(s):  
Myriam Barrejón ◽  
Sara Pla ◽  
Isadora Berlanga ◽  
María J. Gómez-Escalonilla ◽  
Luis Martín-Gomis ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Charge Separation ◽  
Transient Absorption ◽  
Femtosecond Transient Absorption ◽  
Covalently Bonded ◽  
Absorption Studies ◽  
Double Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Three new covalently bonded DWCNT–PDIs have been synthesized and characterized, showing exclusively functionalization of the outer walls leaving the inner walls intact. Femtosecond transient absorption studies were performed to seek evidence of charge separation in these hybrids.

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