scholarly journals Spatially resolved scanning tunneling spectroscopy on single-walled carbon nanotubes

2000 ◽  
Vol 62 (8) ◽  
pp. 5238-5244 ◽  
Author(s):  
L. C. Venema ◽  
J. W. Janssen ◽  
M. R. Buitelaar ◽  
J. W. G. Wildöer ◽  
S. G. Lemay ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Single Walled Carbon Nanotubes ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Single Walled Carbon ◽  
Spatially Resolved ◽  
Walled Carbon Nanotubes

Single-walled carbon nanotubes synthesized by the pyrolysis of pyridine over catalysts

2006 ◽  
Vol 21 (11) ◽  
pp. 2835-2840 ◽  
Author(s):  
J. Liu ◽  
D.L. Carroll ◽  
J. Cech ◽  
S. Roth
Keyword(s):  
Carbon Nanotubes ◽  
Nitrogen Doping ◽  
Doping Concentration ◽  
Local Density ◽  
Single Walled Carbon Nanotubes ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Local Density Of States ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Single-walled carbon nanotubes (SWNTs) were successfully synthesized by pyrolysis of pyridine over MgO supported Fe–Mo or Co–Mo catalysts in the presence of pure H2 or a mixture of H2 and NH3 atmospheres. The average diameters of SWNTs are ∼1.5 and ∼3 nm for pure H2 and the H2 and HN3 mixture, respectively. Scanning tunneling spectroscopy (STS) studies show that the SWNTs grown in both atmospheres are doped with nitrogen substituted into the lattice in a pyridine-type structure. This results in a donor feature in the local density of states with an energy that depends on the nitrogen doping concentration.

Local Electronic Structure in Ordered Aggregates of Carbon Nanotubes: Scanning Tunneling Microscopy/scanning Tunneling Spectroscopy Study

1998 ◽  
Vol 13 (9) ◽  
pp. 2389-2395 ◽  
Author(s):  
D. L. Carroll ◽  
P. M. Ajayan ◽  
S. Curran
Keyword(s):  
Carbon Nanotubes ◽  
Electronic Structure ◽  
Scanning Tunneling Microscopy ◽  
Local Density ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Spatially Resolved ◽  
Local Electronic Structure

The recent application of tunneling probes in electronic structure studies of carbon nanotubes has proven both powerful and challenging. Using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS), local electronic properties in ordered aggregates of carbon nanotubes (multiwalled nanotubes and ropes of single walled nanotubes) have been probed. In this report, we present evidence for interlayer (concentric tube) interactions in multiwalled tubes and tube-tube interactions in singlewalled nanotube ropes. The spatially resolved, local electronic structure, as determined by the local density of electronic states, is shown to clearly reflect tube-tube interactions in both of these aggregate forms.

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