Amphoteric doping of single-wall carbon-nanotube thin films as probed by optical absorption spectroscopy

Kazaoui, Saïd; Minami, Nobutsugu; Jacquemin, R.; Kataura, Hiromichi; Achiba, Yohji

doi:10.1103/physrevb.60.13339

Cited by 255 publications

(252 citation statements)

References 20 publications

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“…Larger wavelengths, corresponding to tubes with smaller bandgap, and thus tubes with larger diameters, were suppressed more effectively. The reduction of absorption peaks is typically attributed to electron depletion from or filling specific bands due to doping [19]. The doping is more efficient for tubes with smaller bandgaps (larger wavelengths).…”

Section: Resultsmentioning

confidence: 99%

Interaction of solid organic acids with carbon nanotube field effect transistors

Klinke

Afzali

Avouris

2006

Chemical Physics Letters

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A series of solid organic acids were used to p-dope carbon nanotubes. The extent of doping is shown to be dependent on the pKa value of the acids. Highly fluorinated carboxylic acids and sulfonic acids are very effective in shifting the threshold voltage and making carbon nanotube field effect transistors to be more p-type devices. Weaker acids like phosphonic or hydroxamic acids had less effect. The doping of the devices was accompanied by a reduction of the hysteresis in the transfer characteristics. In-solution doping survives standard fabrication processes and renders p-doped carbon nanotube field effect transistors with good transport characteristics.

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Section: Resultsmentioning

confidence: 99%

Interaction of solid organic acids with carbon nanotube field effect transistors

Klinke

Afzali

Avouris

2006

Chemical Physics Letters

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“…Similar results were obtained under electrochemical cycling 63 and by controlled doping of thin films of carbon nanotubes. 111,112 Furthermore, solid state doping with halogens has been shown to influence the conductivity and Raman spectra of SWNTs. 113,114 …”

Section: Ionic Chemistry (Doping)mentioning

confidence: 99%

Chemistry of Single-Walled Carbon Nanotubes

et al. 2002

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In this Account we highlight the experimental evidence in favor of our view that carbon nanotubes should be considered as a new macromolecular form of carbon with unique properties and with great potential for practical applications. We show that carbon nanotubes may take on properties that are normally associated with molecular species, such as solubility in organic solvents, solutionbased chemical transformations, chromatography, and spectroscopy. It is already clear that the nascent field of nanotube chemistry will rival that of the fullerenes.

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“…Peak 2 and peak 3 also shift to higher energies, as already reported by Itkis et al 6 The high-frequency changes upon doping have been reported and explained extensively. 27,28 On hole doping, metallic tubes get depleted of charge and therefore a slight decrease in their contribution to the low frequency conductivity is expected. In semiconductors a redistribution of oscillator strength occurs as the highest-lying valence band loses electrons.…”

Section: B Unbaked (Doped) Samplesmentioning

confidence: 99%

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

et al. 2006

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We report on the transmission over a wide frequency range ͑from the far infrared through the visible͒ of pristine and hole-doped, free-standing carbon nanotube films at temperatures between 50 and 300 K. Optical constants are estimated by Kramers-Kronig analysis of the transmittance. We see evidence in the far infrared for a gap below 10 meV. Hole doping causes a shift of spectral weight from the first interband transition into the far infrared. Temperature dependence in both the doped and undoped samples is restricted to the farinfrared region.

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Amphoteric doping of single-wall carbon-nanotube thin films as probed by optical absorption spectroscopy

Cited by 255 publications

References 20 publications

Interaction of solid organic acids with carbon nanotube field effect transistors

Interaction of solid organic acids with carbon nanotube field effect transistors

Chemistry of Single-Walled Carbon Nanotubes

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

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