Charge dynamics in transparent single-walled carbon nanotube films from optical transmission measurements

Borondics, Ferenc; Kamarás, Katalin; Nikolou, Maria; Tanner, D. B.; Chen, Z. H.; Rinzler, Andrew G.

doi:10.1103/physrevb.74.045431

Cited by 119 publications

(121 citation statements)

References 30 publications

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“…It exhibits a broad peak centered at a resonance frequency ! res =2 of roughly 4 THz in agreement with previous reports [8][9][10][11][12][13][14]21]. As seen in Fig.…”

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confidence: 82%

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Mechanism of the Far-Infrared Absorption of Carbon-Nanotube Films

et al. 2008

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The far-infrared conductivity of single-wall carbon-nanotube ensembles is dominated by a broad absorption peak around 4 THz whose origin is still debated. We observe an overall depletion of this peak when the nanotubes are excited by a short visible laser pulse. This finding excludes optical absorption due to a particle-plasmon resonance and instead shows that interband transitions in tubes with an energy gap of $10 meV dominate the far-infrared conductivity. A simple model based on an ensemble of two-level systems naturally explains the weak temperature dependence of the far-infrared conductivity by the tubeto-tube variation of the chemical potential.

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“…It exhibits a broad peak centered at a resonance frequency ! res =2 of roughly 4 THz in agreement with previous reports [8][9][10][11][12][13][14]21]. As seen in Fig.…”

supporting

confidence: 82%

“…1(b), particle plasmons [10] were suggested as alternative mechanisms. It is crucial to clarify this point, since the FIR absorption has already been extensively used as a sensitive probe of side chains covalently bound to the NT wall [11] and of the doping level of the tubes [12][13][14].…”

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confidence: 99%

Mechanism of the Far-Infrared Absorption of Carbon-Nanotube Films

et al. 2008

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“…16,19,26 To gain more quantitative understanding via comparison with theoretical models, we performed KramersKronig (KK) transformation on our broadband transmission spectra T (ω) and obtained the phase spectra φ t (ω). 20,24,43 We first interpolated the T (ω) data in the region between the THz and IR and then applied fourpass binomial smoothing to prevent spikes. On the UV side, we extrapolated T (ω) by using 1 − Aω −n , where A is a real constant and n is around 1.…”

Section: Discussionmentioning

confidence: 99%

“…[13][14][15][16][17][18][19][20][21][22][23][24][25][26] Two interpretations have emerged regarding the THz peak, but there is no consensus about its origin. One of the possible mechanisms proposed by many authors 14,[20][21][22] is based on interband absorption across the curvature-induced bandgap 27,28 in non-armchair metallic SWCNTs, while the other is the plasmon resonance in metallic and doped semiconducting SWCNTs due to their finite lengths. 16,19,23,25,29 Hence, spectroscopic studies of type-sorted SWCNT samples are crucial for determining which of the two working hypotheses is correct.…”

Section: -12mentioning

confidence: 99%

Plasmonic Nature of the Terahertz Conductivity Peak in Single-Wall Carbon Nanotubes

et al. 2013

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Plasmon resonance is expected to occur in metallic and doped semiconducting carbon nanotubes in the terahertz frequency range, but its convincing identification has so far been elusive. The origin of the terahertz conductivity peak commonly observed for carbon nanotube ensembles remains controversial. Here we present results of optical, terahertz, and DC transport measurements on highly enriched metallic and semiconducting nanotube films. A broad and strong terahertz conductivity peak appears in both types of films, whose behaviors are consistent with the plasmon resonance explanation, firmly ruling out other alternative explanations such as absorption due to curvature-induced gaps.

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“…The transmission coefficient is an analytical function whose phase and amplitude satisfy a dispersion relation. Therefore, the phase can be analytically calculated from the integral of the amplitude [13], similar to the Kramers-Kronig transformation of single-bounce reflectance:…”

Section: T I Imentioning

confidence: 99%

Calculation of optical constants from carbon nanotube transmission spectra

Pekker

Borondics

Rinzler

et al. 2006

Physica Status Solidi (b)

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We want to clarify a few issues about using optical absorption spectra for characterizing carbon nanotubes. The common method of using optical density for nanotube counting is reasonable in the nearinfrared and visible spectral region, but fails for the mid and far infrared, where metallic tubes can be unambigously detected. By performing Kramers -Kronig transformation on wide-range transmittance spectra of free-standing films, the far-infrared spectral region creates a unique possibility for estimating the amount of metallic tubes in different nanotube networks. We want to clarify a few issues about using optical absorption spectra for characterizing carbon nanotubes. The common method of using optical density for nanotube counting is reasonable in the nearinfrared and visible spectral region, but fails for the mid and far infrared, where metallic tubes can be unambigously detected. By performing Kramers -Kronig transformation on wide-range transmittance spectra of free-standing films, the far-infrared spectral region creates a unique possibility for estimating the amount of metallic tubes in different nanotube networks.

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Charge dynamics in transparent single-walled carbon nanotube films from optical transmission measurements

Cited by 119 publications

References 30 publications

Mechanism of the Far-Infrared Absorption of Carbon-Nanotube Films

Mechanism of the Far-Infrared Absorption of Carbon-Nanotube Films

Plasmonic Nature of the Terahertz Conductivity Peak in Single-Wall Carbon Nanotubes

Calculation of optical constants from carbon nanotube transmission spectra

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