Molecular orientation and photoswitching kinetics on single-walled carbon nanotubes by optical second harmonic generation

David J. McGee; Changshui Huang; Myungwoong Kim; Jonathan W. Choi; Mark A. Eriksson; Padma Gopalan

doi:10.1063/1.4772786

Molecular orientation and photoswitching kinetics on single-walled carbon nanotubes by optical second harmonic generation

David J. McGee, Changshui Huang, Myungwoong Kim, Jonathan W. Choi, Mark A. Eriksson, Padma Gopalan

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

9 Scopus citations

Abstract

Electrical conduction through chromophore-functionalized nanotubes can be modulated by light with wavelengths expected to isomerize the chromophores. Here, we use second harmonic generation to directly measure the orientation and photoisomerization kinetics of azo-benzene chromophores on single-walled carbon nanotubes. We find a net chromophore orientation with an average chromophore tilt angle of 40°± 3°. We show that this angle can be reduced effectively to zero with an applied corona field. Periodic illumination with unpolarized 495 nm light induces reversible trans-cis switching, enabling the extraction of switching time scales both with and without an applied electric field.

Original language	English
Article number	264101
Journal	Applied Physics Letters
Volume	101
Issue number	26
DOIs	https://doi.org/10.1063/1.4772786
State	Published - 24 Dec 2012
Externally published	Yes

Bibliographical note

Funding Information:
P.G., M.A.E., and C.H. acknowledge support from the Division of Materials Sciences and Engineering, Office of Basic Energy Science, U.S. Department of Energy under Award No. ER46590 for the synthesis, fabrication, and characterization of the hybrids. P.G. acknowledges NSF CAREER Award No. DMR-0449688 for funds supporting SHG experimental work. D.J.M. acknowledges support from NSF-DMR Award No. 1138416 as well as the technical assistance of D. Schwandt and U. Labahn for SHG characterization.

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title = "Molecular orientation and photoswitching kinetics on single-walled carbon nanotubes by optical second harmonic generation",

abstract = "Electrical conduction through chromophore-functionalized nanotubes can be modulated by light with wavelengths expected to isomerize the chromophores. Here, we use second harmonic generation to directly measure the orientation and photoisomerization kinetics of azo-benzene chromophores on single-walled carbon nanotubes. We find a net chromophore orientation with an average chromophore tilt angle of 40°± 3°. We show that this angle can be reduced effectively to zero with an applied corona field. Periodic illumination with unpolarized 495 nm light induces reversible trans-cis switching, enabling the extraction of switching time scales both with and without an applied electric field.",

author = "McGee, {David J.} and Changshui Huang and Myungwoong Kim and Choi, {Jonathan W.} and Eriksson, {Mark A.} and Padma Gopalan",

note = "Funding Information: P.G., M.A.E., and C.H. acknowledge support from the Division of Materials Sciences and Engineering, Office of Basic Energy Science, U.S. Department of Energy under Award No. ER46590 for the synthesis, fabrication, and characterization of the hybrids. P.G. acknowledges NSF CAREER Award No. DMR-0449688 for funds supporting SHG experimental work. D.J.M. acknowledges support from NSF-DMR Award No. 1138416 as well as the technical assistance of D. Schwandt and U. Labahn for SHG characterization.",

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T1 - Molecular orientation and photoswitching kinetics on single-walled carbon nanotubes by optical second harmonic generation

AU - McGee, David J.

AU - Huang, Changshui

AU - Kim, Myungwoong

AU - Choi, Jonathan W.

AU - Eriksson, Mark A.

AU - Gopalan, Padma

N1 - Funding Information: P.G., M.A.E., and C.H. acknowledge support from the Division of Materials Sciences and Engineering, Office of Basic Energy Science, U.S. Department of Energy under Award No. ER46590 for the synthesis, fabrication, and characterization of the hybrids. P.G. acknowledges NSF CAREER Award No. DMR-0449688 for funds supporting SHG experimental work. D.J.M. acknowledges support from NSF-DMR Award No. 1138416 as well as the technical assistance of D. Schwandt and U. Labahn for SHG characterization.

PY - 2012/12/24

Y1 - 2012/12/24

N2 - Electrical conduction through chromophore-functionalized nanotubes can be modulated by light with wavelengths expected to isomerize the chromophores. Here, we use second harmonic generation to directly measure the orientation and photoisomerization kinetics of azo-benzene chromophores on single-walled carbon nanotubes. We find a net chromophore orientation with an average chromophore tilt angle of 40°± 3°. We show that this angle can be reduced effectively to zero with an applied corona field. Periodic illumination with unpolarized 495 nm light induces reversible trans-cis switching, enabling the extraction of switching time scales both with and without an applied electric field.

AB - Electrical conduction through chromophore-functionalized nanotubes can be modulated by light with wavelengths expected to isomerize the chromophores. Here, we use second harmonic generation to directly measure the orientation and photoisomerization kinetics of azo-benzene chromophores on single-walled carbon nanotubes. We find a net chromophore orientation with an average chromophore tilt angle of 40°± 3°. We show that this angle can be reduced effectively to zero with an applied corona field. Periodic illumination with unpolarized 495 nm light induces reversible trans-cis switching, enabling the extraction of switching time scales both with and without an applied electric field.

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JO - Applied Physics Letters

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ER -

Molecular orientation and photoswitching kinetics on single-walled carbon nanotubes by optical second harmonic generation

Abstract

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