Photoinduced luminescence blinking and bleaching in individual single-walled carbon nanotubes

Carsten Georgi; Nicolai Hartmann; Tobias Gokus; Alexander A. Green; Mark C. Hersam; Achim Hartschuh

doi:10.1002/cphc.200800179

Photoinduced luminescence blinking and bleaching in individual single-walled carbon nanotubes

Carsten Georgi, Nicolai Hartmann, Tobias Gokus, Alexander A. Green, Mark C. Hersam, Achim Hartschuh

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

The temporal evolution of photoluminescence in individual single-walled carbon nanotubes (SWNT) under strong laser irradiation is studied and pronounced blinking and bleaching is observed, caused by photoinduced oxidation that subsequently quenches mobile excitons. The nanotubes are isolated with sodium cholate and spun onto either a glass or mica surface. Their bleaching behavior is investigated for variable laser intensities in air and argon atmosphere. The decay rate for luminescence bleaching generally increases with higher laser intensity, however saturating on mica substrates, which is attributed to limited availability of oxygen in the vicinity of the nanotubes. Step-like events in the luminescence time traces corresponding to single oxidation events are analyzed regarding relative step height and suggest an exciton diffusion range of about 105 nm.

Original language	English (US)
Pages (from-to)	1460-1464
Number of pages	5
Journal	ChemPhysChem
Volume	9
Issue number	10
DOIs	https://doi.org/10.1002/cphc.200800179
State	Published - Jul 14 2008
Externally published	Yes

Keywords

Carbon nanotubes
Chemisorption
Luminescence
Oxidation
Quenching

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
Physical and Theoretical Chemistry

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10.1002/cphc.200800179

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title = "Photoinduced luminescence blinking and bleaching in individual single-walled carbon nanotubes",

abstract = "The temporal evolution of photoluminescence in individual single-walled carbon nanotubes (SWNT) under strong laser irradiation is studied and pronounced blinking and bleaching is observed, caused by photoinduced oxidation that subsequently quenches mobile excitons. The nanotubes are isolated with sodium cholate and spun onto either a glass or mica surface. Their bleaching behavior is investigated for variable laser intensities in air and argon atmosphere. The decay rate for luminescence bleaching generally increases with higher laser intensity, however saturating on mica substrates, which is attributed to limited availability of oxygen in the vicinity of the nanotubes. Step-like events in the luminescence time traces corresponding to single oxidation events are analyzed regarding relative step height and suggest an exciton diffusion range of about 105 nm.",

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AU - Georgi, Carsten

AU - Hartmann, Nicolai

AU - Gokus, Tobias

AU - Green, Alexander A.

AU - Hersam, Mark C.

AU - Hartschuh, Achim

PY - 2008/7/14

Y1 - 2008/7/14

N2 - The temporal evolution of photoluminescence in individual single-walled carbon nanotubes (SWNT) under strong laser irradiation is studied and pronounced blinking and bleaching is observed, caused by photoinduced oxidation that subsequently quenches mobile excitons. The nanotubes are isolated with sodium cholate and spun onto either a glass or mica surface. Their bleaching behavior is investigated for variable laser intensities in air and argon atmosphere. The decay rate for luminescence bleaching generally increases with higher laser intensity, however saturating on mica substrates, which is attributed to limited availability of oxygen in the vicinity of the nanotubes. Step-like events in the luminescence time traces corresponding to single oxidation events are analyzed regarding relative step height and suggest an exciton diffusion range of about 105 nm.

AB - The temporal evolution of photoluminescence in individual single-walled carbon nanotubes (SWNT) under strong laser irradiation is studied and pronounced blinking and bleaching is observed, caused by photoinduced oxidation that subsequently quenches mobile excitons. The nanotubes are isolated with sodium cholate and spun onto either a glass or mica surface. Their bleaching behavior is investigated for variable laser intensities in air and argon atmosphere. The decay rate for luminescence bleaching generally increases with higher laser intensity, however saturating on mica substrates, which is attributed to limited availability of oxygen in the vicinity of the nanotubes. Step-like events in the luminescence time traces corresponding to single oxidation events are analyzed regarding relative step height and suggest an exciton diffusion range of about 105 nm.

KW - Carbon nanotubes

KW - Chemisorption

KW - Luminescence

KW - Oxidation

KW - Quenching

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Photoinduced luminescence blinking and bleaching in individual single-walled carbon nanotubes

Abstract

Keywords

ASJC Scopus subject areas

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