Effect of oxidation on electronic and geometric properties of carbon nanotubes

Seong Chu Lim; Chul Su Jo; Hee Jin Jeong; Young Min Shin; Young Hee Lee; Iran Amildo Samayoa; Jaewu Choi

doi:10.1143/jjap.41.5635

Effect of oxidation on electronic and geometric properties of carbon nanotubes

Seong Chu Lim, Chul Su Jo, Hee Jin Jeong, Young Min Shin, Young Hee Lee, Iran Amildo Samayoa, Jaewu Choi

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26 Citations (Scopus)

Abstract

We have studied an oxidation effect of multiwalled carbon nanotubes (MWCNTs) grown by thermal chemical vapor deposition (CVD) using ultraviolet photoelectron spectroscopy (LIPS) and transmission electron microscopy (TEM). With an increasing oxygen exposure, the carbon 2p-π states at ∼3 eV below the Fermi level in the UPS spectra almost disappear, whereas the 2p-σ states around 6 eV are significantly increased. Annealing above 1000 K results in an increase of the density of states (DOSs) near the Fermi level, although a complete recovery of the 2p-π electron states is not observed. We also observe a mode around 23 eV that is associated with the collective σ + π plasmon excitation and chemisorbed C-O bonds, which is confirmed by the density functional calculations.

Original language	English
Pages (from-to)	5635-5639
Number of pages	5
Journal	Japanese Journal of Applied Physics
Volume	41
Issue number	9
DOIs	https://doi.org/10.1143/jjap.41.5635
Publication status	Published - Sept 2002

Keywords

Carbon nanotubes
Density of states
Oxidation
Transformation from metallic to semiconducting tube
σ + π plasmon excitation

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10.1143/jjap.41.5635

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title = "Effect of oxidation on electronic and geometric properties of carbon nanotubes",

abstract = "We have studied an oxidation effect of multiwalled carbon nanotubes (MWCNTs) grown by thermal chemical vapor deposition (CVD) using ultraviolet photoelectron spectroscopy (LIPS) and transmission electron microscopy (TEM). With an increasing oxygen exposure, the carbon 2p-π states at ∼3 eV below the Fermi level in the UPS spectra almost disappear, whereas the 2p-σ states around 6 eV are significantly increased. Annealing above 1000 K results in an increase of the density of states (DOSs) near the Fermi level, although a complete recovery of the 2p-π electron states is not observed. We also observe a mode around 23 eV that is associated with the collective σ + π plasmon excitation and chemisorbed C-O bonds, which is confirmed by the density functional calculations.",

keywords = "Carbon nanotubes, Density of states, Oxidation, Transformation from metallic to semiconducting tube, σ + π plasmon excitation",

author = "Lim, {Seong Chu} and Jo, {Chul Su} and Jeong, {Hee Jin} and Shin, {Young Min} and Lee, {Young Hee} and Samayoa, {Iran Amildo} and Jaewu Choi",

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T1 - Effect of oxidation on electronic and geometric properties of carbon nanotubes

AU - Lim, Seong Chu

AU - Jo, Chul Su

AU - Jeong, Hee Jin

AU - Shin, Young Min

AU - Lee, Young Hee

AU - Samayoa, Iran Amildo

AU - Choi, Jaewu

PY - 2002/9

Y1 - 2002/9

N2 - We have studied an oxidation effect of multiwalled carbon nanotubes (MWCNTs) grown by thermal chemical vapor deposition (CVD) using ultraviolet photoelectron spectroscopy (LIPS) and transmission electron microscopy (TEM). With an increasing oxygen exposure, the carbon 2p-π states at ∼3 eV below the Fermi level in the UPS spectra almost disappear, whereas the 2p-σ states around 6 eV are significantly increased. Annealing above 1000 K results in an increase of the density of states (DOSs) near the Fermi level, although a complete recovery of the 2p-π electron states is not observed. We also observe a mode around 23 eV that is associated with the collective σ + π plasmon excitation and chemisorbed C-O bonds, which is confirmed by the density functional calculations.

AB - We have studied an oxidation effect of multiwalled carbon nanotubes (MWCNTs) grown by thermal chemical vapor deposition (CVD) using ultraviolet photoelectron spectroscopy (LIPS) and transmission electron microscopy (TEM). With an increasing oxygen exposure, the carbon 2p-π states at ∼3 eV below the Fermi level in the UPS spectra almost disappear, whereas the 2p-σ states around 6 eV are significantly increased. Annealing above 1000 K results in an increase of the density of states (DOSs) near the Fermi level, although a complete recovery of the 2p-π electron states is not observed. We also observe a mode around 23 eV that is associated with the collective σ + π plasmon excitation and chemisorbed C-O bonds, which is confirmed by the density functional calculations.

KW - Carbon nanotubes

KW - Density of states

KW - Oxidation

KW - Transformation from metallic to semiconducting tube

KW - σ + π plasmon excitation

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Effect of oxidation on electronic and geometric properties of carbon nanotubes

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Keywords

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