Third-Nearest-Neighbors Tight-Binding Description of Optical Response of Carbon Nanotubes: Effects of Chirality and Diameter

Chegel, Raad

doi:10.1007/s11664-015-3877-3

Cited by 12 publications

(6 citation statements)

References 41 publications

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“…This is reasonable because the energy of the second valence band of semiconducting SWCNTs strongly depends on the nanotube diameter. [ 41,58 ] The calculation results for metallic SWCNTs with different average diameters show a similar dependence of ISBP energy and intensity on nanotube diameter, supporting the experimental results (Figure S12, Supporting Information).…”

Section: Resultssupporting

confidence: 77%

“…In their work, the use of mixed nanotube samples containing metallic and semiconducting SWCNTs with a wide diameter distribution renders unambiguous assessment of the influence of the diameter and electronic types of SWCNTs on their ISBPs difficult. It is well known that there is a significant difference in excitonic band structure [ 38–41 ] and selection rules [ 42 ] on allowed intersubband transitions between semiconducting and metallic SWCNTs. Therefore, ISBP‐derived excitations are reasonably expected to be different for semiconducting and metallic SWCNTs, but a detailed study has not been performed.…”

Section: Introductionmentioning

confidence: 99%

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Electronic Type and Diameter Dependence of the Intersubband Plasmons of Single‐Wall Carbon Nanotubes

Wang

Yang

et al. 2021

Adv Funct Materials

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The intersubband plasmons (ISBPs) of single‐wall carbon nanotubes (SWCNTs) endow SWCNT‐based optoelectronic devices with more functions. However, the structural dependence of the ISBPs of SWCNTs is not fully understood. Here, the effect of electronic types and diameters of SWCNTs on the energy and intensity of their ISBPs is investigated systematically. The results show that the ISBP energy of semiconducting SWCNTs is ≈50–250 meV larger than that of metallic SWCNTs with the same diameters, while the ISBP integral intensity is approximately 1.25 to 4 times stronger. Diameter dependence of ISBPs for both semiconducting and metallic SWCNTs is also observed. With a decrease in diameter, the ISBPs shift to higher energies, while the intensity decreases dramatically. When the diameter is reduced to less than 1 nm, the ISBPs become unobservable. Interestingly, the energy separation between the ISBPs and interband transition S22 (M11) decreases with an increase in diameter. Theoretical calculations show that the structure‐dependent ISBP characteristics are dominated by the electronic states of SWCNTs. Based on the ISBP characteristics of different SWCNTs, high‐performance SWCNT‐based near‐infrared electrochromic devices are fabricated by mixing small‐diameter metallic SWCNTs with semiconducting SWCNTs due to their high conductivity and negligible ISBP signals.

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Section: Resultssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Electronic Type and Diameter Dependence of the Intersubband Plasmons of Single‐Wall Carbon Nanotubes

Wang

Yang

et al. 2021

Adv Funct Materials

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“…To obtain the energy band structure of carbon nanotubes, we adopt the zone-folding approximation of graphene with long-range atomic interactions up to the third nearest-neighbor transfer integrals, or the socalled third nearest-neighbor tight-binding (3rd NNTB) model [43,44]. Although this approach does not include the curvature effect, the resulting band structure is sufficiently accurate for SWNTs with diameter larger than 1 nm [45].…”

Section: A Defining Plasmons From Dielectric Functionmentioning

confidence: 99%

Intersubband plasmon excitations in doped carbon nanotubes

et al. 2019

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We theoretically investigate intersubband plasmon excitations in doped single wall carbon nanotubes (SWNTs) by examining the dependence of plasmon frequency on the nanotube diameter, chirality, and Fermi energy. The intersubband plasmons can be excited by light with polarization perpendicular to the nanotube axis and thus the plasmon excitations corresponds to optical transitions between the two different subbands, which are sensitive to the Fermi energy. In every SWNT, this mechanism leads to the emergence of the optical absorption peak at the plasmon frequency for a given Fermi energy, EF . The plasmon frequencies calculated for many SWNTs with diameter dt < 2 nm exhibit a dependence on (1/dt) 0.7 and the frequencies are further affected by Fermi energy as E 0.25 F . With this knowledge, it is possible to develop a map of intersubband plasmon excitations in doped SWNTs that could be useful to quickly estimate the doping level and also be an alternative way to characterize nanotube chirality.

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“…For clarity of the picture, we plot the van Hove singularity transitions with corresponding Fermi level shift in the density of states (DOS) of typical 2 nm in diameter semiconducting and metallic nanotubes (Figure f) calculated within the third-nearest-neighbor tight-binding mode . While the doping time and corresponding amount of dopant (Figure S9) increase, the van Hove singularity transitions disappear one by one (Figure a,f).…”

mentioning

confidence: 99%

Aerosol-Assisted Fine-Tuning of Optoelectrical Properties of SWCNT Films

Tsapenko

Romanov

Satco

et al. 2019

J. Phys. Chem. Lett.

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We propose a novel, scalable, and simple method for aerosol doping of single-walled carbon nanotube (SWCNT) films. This method is based on aerosolization of a dopant solution (HAuCl4 in ethanol) and time-controlled deposition of uniform aerosol particles on the nanotube film surface. The approach developed allows fine-tuning of the SWCNT work function in the range of 4.45 (for pristine nanotubes) to 5.46 eV, controllably varying the sheet resistance of the films from 79 to 3.2 Ω/□ for the SWCNT films with 50% transmittance (at 550 nm). This opens a new avenue for traditional and flexible optoelectronics, both to replace existing indium–tin oxide electrodes and to develop novel applications of the highly conductive transparent films.

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Third-Nearest-Neighbors Tight-Binding Description of Optical Response of Carbon Nanotubes: Effects of Chirality and Diameter

Cited by 12 publications

References 41 publications

Electronic Type and Diameter Dependence of the Intersubband Plasmons of Single‐Wall Carbon Nanotubes

Electronic Type and Diameter Dependence of the Intersubband Plasmons of Single‐Wall Carbon Nanotubes

Intersubband plasmon excitations in doped carbon nanotubes

Aerosol-Assisted Fine-Tuning of Optoelectrical Properties of SWCNT Films

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