scholarly journals Wide-range optical studies on various single-walled carbon nanotubes: Origin of the low-energy gap

2011 ◽  
Vol 84 (7) ◽  
Author(s):  
Á. Pekker ◽  
K. Kamarás
Keyword(s):  
Carbon Nanotubes ◽  
Energy Gap ◽  
Single Walled Carbon Nanotubes ◽  
Low Energy ◽  
Optical Studies ◽  
Single Walled Carbon ◽  
Wide Range ◽  
Walled Carbon Nanotubes

scholarly journals Low-Energy Irradiation Damage in Single-Walled Carbon Nanotubes

2007 ◽  
Vol 994 ◽  
Author(s):  
Satoru Suzuki ◽  
Yoshihiro Kobayashi
Keyword(s):  
Carbon Nanotubes ◽  
Chemical Properties ◽  
Single Walled Carbon Nanotubes ◽  
Low Energy ◽  
Irradiation Damage ◽  
Single Walled Carbon ◽  
Photon Irradiation ◽  
Energy Irradiation ◽  
Physical And Chemical ◽  
Walled Carbon Nanotubes

AbstractWe show that low-energy (20 eV–20 keV) electron or photon irradiation extinguishes the characteristic physical and chemical properties of single-walled carbon nanotubes, indicating that the irradiation damages the nanotubes. The irradiation-induced defects convert the electric properties of metallic SWNTs to semiconducting, and the nominal bandgap can be tuned simply by the irradiation dose. The defects also have the following interesting properties. The damage and recovery are reversible, indicating that the number of carbon atoms is preserved. The damage and recovery strongly depend on the diameter, suggesting that the damage is prominent in a rolled up graphene sheet, but not in a planar one. The activation energy of the defect healing is so small, depending on the diameter, that the defects can be healed even at room temperature or below.

scholarly journals Reversible Charge Transfer with Single‐Walled Carbon Nanotubes Upon Harvesting the Low Energy Part of the Solar Spectrum

Small ◽  
2020 ◽  
Vol 16 (8) ◽  
pp. 1906745 ◽  
Author(s):  
Arjun Menon ◽  
Yuri L. Slominskii ◽  
Jan Joseph ◽  
Oleg P. Dimitriev ◽  
Dirk M. Guldi
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Solar Spectrum ◽  
Single Walled Carbon Nanotubes ◽  
Low Energy ◽  
Single Walled Carbon ◽  
Energy Part ◽  
Walled Carbon Nanotubes

Raman Scattering of Single-Walled Carbon Nanotubes Implanted with Ultra-Low-Energy Oxygen Ions

2005 ◽  
Vol 44 (4A) ◽  
pp. 1615-1620 ◽  
Author(s):  
Yasuhide Ohno ◽  
Koichi Inoue ◽  
Takafumi Kamimura ◽  
Kenzo Maehashi ◽  
Kazuhiro Yamamoto ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Scattering ◽  
Single Walled Carbon Nanotubes ◽  
Low Energy ◽  
Single Walled Carbon ◽  
Oxygen Ions ◽  
Walled Carbon Nanotubes

BORON/PHOSPHORUS CO-DOPING IN ZIGZAG SINGLE-WALLED CARBON NANOTUBES: A FIRST-PRINCIPLES STUDY

2013 ◽  
Vol 27 (15) ◽  
pp. 1350114
Author(s):  
FUSHENG LUO ◽  
QINGYI SHAO ◽  
LIXIA ZHANG ◽  
JUAN ZHANG ◽  
ZHONGLIANG PAN
Keyword(s):  
Carbon Nanotubes ◽  
First Principles ◽  
Function Theory ◽  
Energy Gap ◽  
Single Walled Carbon Nanotubes ◽  
Band Structures ◽  
Single Walled Carbon ◽  
Co Doping ◽  
Walled Carbon Nanotubes ◽  
Formation Energies

By using the first-principles methods based on density function theory (DFT), the effects of boron(B)/phosphorus(P) pair co-doping on the electrical properties of zigzag single-walled carbon nanotubes (SWNTs) have been investigated. We calculated the formation energies and band structures of (6, 0) metallic and (8, 0) semiconducting SWNTs with different B/P co-doping sites and concentrations. The obtained formation energies suggest that the B/P co-doping configurations are energetically stable structures and the B and P tend to form a B–P bond. It shows that an energy gap is opened by B/P co-doping in (6, 0) metallic SWNTs and the metallic carbon nanotubes are converted into semiconductors. For the (8, 0) semiconducting SWNTs, B/P co-doping influences the band structure, but it does not change the attributes essentially and the SWNTs are still semiconducting. It was also found that the band structures depend on the doping concentration as well as the doping site of B/P pair.

FUNCTIONALIZATION EFFECT ON THE ELECTRONIC PROPERTIES OF SINGLE WALLED CARBON NANOTUBES

2008 ◽  
Vol 01 (01) ◽  
pp. 1-6 ◽  
Author(s):  
SAN HUA LIM ◽  
JIANYI LIN ◽  
LEI LIU ◽  
HUI PAN ◽  
HUA LONG PAN ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Raman Scattering ◽  
Photoelectron Spectroscopy ◽  
Energy Gap ◽  
Variable Temperature ◽  
Ultra Violet ◽  
Single Walled Carbon Nanotubes ◽  
Bulk Sample ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

OH-functionalized single-walled carbon nanotubes (SWNTs), i.e. SWNT–OH, were prepared through the ball-milling of purified SWNTs with KOH. The composition of the pristine SWNTs bulk sample was characterized by resonance Raman scattering. The OH-functionalization-induced shrinking of the energy gap, the charge transfer from C to –OH, the depletion of top valence band density, the modification of energy band structure and the significant reduction in the work function of SWNTs were experimentally studied by variable temperature FTIR, Raman scattering, ultra-violet photoelectron spectroscopy, X-ray photoelectron energy loss spectroscopy etc. Ab initio calculation was also performed to assist the discussion.

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