Fermi level dependent optical transition energy in metallic single-walled carbon nanotubes

Carbon ◽  
2011 ◽  
Vol 49 (14) ◽  
pp. 4774-4780 ◽  
Author(s):  
Li-Chang Yin ◽  
Hui-Ming Cheng ◽  
Riichiro Saito ◽  
Mildred S. Dresselhaus
Keyword(s):  
Carbon Nanotubes ◽  
Fermi Level ◽  
Transition Energy ◽  
Optical Transition ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Optical Transition Energy ◽  
Walled Carbon Nanotubes

Selective Synthesis of Single-Walled Carbon Nanotubes by Blending Catalysts

2007 ◽  
Author(s):  
Shuhei Inoue ◽  
Takeshi Nakajima ◽  
Kazuya Nomura ◽  
Yoshihiro Kikuchi
Keyword(s):  
Carbon Nanotubes ◽  
Fermi Level ◽  
Chemical Vapor ◽  
Single Walled Carbon Nanotubes ◽  
Diameter Distribution ◽  
Efficient Catalyst ◽  
Single Walled Carbon ◽  
Similar Density ◽  
Walled Carbon Nanotubes ◽  
Diameter Distributions

Single-walled carbon nanotubes are considered the most attractive material and a lot of synthesis processes are developed. Among these synthesis processes chemical vapor deposition processes are considered to be most suitable for macroscopic production. In many CVD processes the alcohol catalytic CVD process can be the best process because it can produce very pure nanotubes without any purification. However, cobalt is essential as a catalyst that makes the flexibility of catalysts restricted. In this paper, our investigation mainly focused on as follows: The efficiency of combined catalysts with/without cobalt. The diameter distributions against catalysts density. The electrical states of catalysts near Fermi level. Consequently, almost all of cobalt containing catalysts worked well, and the diameter distributions were proportional to the particle size. Efficient catalysts had enough states around Fermi level and the cobalt-less efficient catalyst cluster model showed the similar density of state to the cobalt cluster. Thus, noticing to the DOS, other efficient catalysts can be discovered and the diameter distribution will be controllable by adjusting temperature, a catalyst size, and a catalyst combination without any complicated techniques and facilities.

scholarly journals Universal Kataura Plot for Optical Transition Energies of Single-Walled Carbon Nanotubes (abstract)

2009 ◽  
Author(s):  
Jong Hyun Choi ◽  
Michael S. Strano ◽  
Beverly Karplus Hartline ◽  
Renee K. Horton ◽  
Catherine M. Kaicher
Keyword(s):  
Carbon Nanotubes ◽  
Optical Transition ◽  
Single Walled Carbon Nanotubes ◽  
Transition Energies ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Fermi level engineering of metallicity-sorted metallic single-walled carbon nanotubes by encapsulation of few-atom-thick crystals of silver chloride

2018 ◽  
Vol 53 (18) ◽  
pp. 13018-13029 ◽  
Author(s):  
Marianna V. Kharlamova ◽  
Christian Kramberger ◽  
Oleg Domanov ◽  
Andreas Mittelberger ◽  
Kazuhiro Yanagi ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fermi Level ◽  
Silver Chloride ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

scholarly journals Ultrafast Mid-Infrared Intra-Excitonic Response of Individualized Single-Walled Carbon Nanotubes

2009 ◽  
Vol 1230 ◽  
Author(s):  
Jigang Wang ◽  
Matt W. Graham ◽  
Yingzhong Ma ◽  
Graham R. Fleming ◽  
Robert A Kaindl
Keyword(s):  
Carbon Nanotubes ◽  
Transition Energy ◽  
Single Walled Carbon Nanotubes ◽  
Energy Response ◽  
Mid Infrared ◽  
Single Walled Carbon ◽  
Excitonic Absorption ◽  
Ir Studies ◽  
A Value ◽  
Walled Carbon Nanotubes

AbstractWe present femtosecond mid-infrared (mid-IR) studies of the broadband low-energy response of individualized (6,5) and (7,5) single-walled carbon nanotubes. Strong photoinduced absorption is observed in these semiconducting tubes around 200 meV photon energy. The transition energy and broadly sloping spectral shape are characteristic of quasi 1D intra-excitonic transitions between different relative-momentum states. Our result yields a value of the intra-excitonic absorption cross section of σ∥MIR≈4×10-5.

Influence of Gas Adsorption on Optical Transition Energies of Single-Walled Carbon Nanotubes

Nano Letters ◽  
2008 ◽  
Vol 8 (10) ◽  
pp. 3097-3101 ◽  
Author(s):  
Shohei Chiashi ◽  
Satoshi Watanabe ◽  
Tateki Hanashima ◽  
Yoshikazu Homma
Keyword(s):  
Carbon Nanotubes ◽  
Gas Adsorption ◽  
Optical Transition ◽  
Single Walled Carbon Nanotubes ◽  
Transition Energies ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Fermi Level Engineering of Single-Walled Carbon Nanotubes by AuCl3Doping

2008 ◽  
Vol 130 (38) ◽  
pp. 12757-12761 ◽  
Author(s):  
Ki Kang Kim ◽  
Jung Jun Bae ◽  
Hyeon Ki Park ◽  
Soo Min Kim ◽  
Hong-Zhang Geng ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Fermi Level ◽  
Single Walled Carbon Nanotubes ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

Systematic Study of Work Functions of Single-walled Carbon Nanotubes

2009 ◽  
Vol 1204 ◽  
Author(s):  
Koichiro Kato ◽  
Susumu Saito
Keyword(s):  
Carbon Nanotubes ◽  
Fermi Level ◽  
Systematic Study ◽  
Density Functional ◽  
Small Diameter ◽  
Single Walled Carbon Nanotubes ◽  
Chiral Angle ◽  
Single Walled Carbon ◽  
Work Functions ◽  
Walled Carbon Nanotubes

AbstractThe work function is one of the crucial quantities in understanding their field emission properties and applying carbon nanotubes to electronic devices. We perform the systematic study of work functions of 44 kinds of isolated single-walled carbon nanotubes in the framework of the density functional theory. It has been revealed that the first-principles study plays a very important role for predicting various properties of carbon nanotubes. In general, we have to perform the structural relaxation in order to know the accurate electronic properties of carbon nanotubes. Therefore we carry out the complete geometrical relaxations for 44 kinds of carbon nanotubes and evaluate their work functions. The diameters (D) of nanotubes studied satisfy 0.3 < D < 2.0 nm. Especially, we focus on the small diameter carbon nanotubes. We determine the values of work functions from the difference between the Fermi level and the vacuum level. In the semiconducting carbon nanotubes, the Fermi level is chosen at the midgap. As a result, it is found that the carbon nanotubes should be classified into three classes according to the diameter and chiral-angle dependences of work functions.

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