Transient reflectivity on vertically aligned single-wall carbon nanotubes

Gianluca Galimberti; Stefano Ponzoni; Gabriele Ferrini; Stephan Hofmann; Muhammad Arshad; Cinzia Cepek; Stefania Pagliara

doi:10.1016/j.tsf.2013.02.133

Transient reflectivity on vertically aligned single-wall carbon nanotubes

Gianluca Galimberti, Stefano Ponzoni, Gabriele Ferrini, Stephan Hofmann, Muhammad Arshad, Cinzia Cepek, Stefania Pagliara^*

^*Corresponding author for this work

Surfaces and Thin Films

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

3 Citations (Scopus)

Abstract

One-color transient reflectivity measurements are carried out on two different samples of vertically aligned single-wall carbon nanotube bundles and compared with the response recently published on unaligned bundles. The negative sign of the optical response for both samples indicates that the free electron character revealed on unaligned bundles is only due to the intertube interactions favored by the tube bending. Neither the presence of bundles nor the existence of structural defects in aligned bundles is able to induce a free-electron like behavior of the photoexcited carriers. This result is also confirmed by the presence of non-linear excitonic effects in the transient response of the aligned bundles. (C) 2013 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	51-55
Number of pages	5
Journal	Thin Solid Films
Volume	543
DOIs	https://doi.org/10.1016/j.tsf.2013.02.133
Publication status	Published - 30-Sept-2013
Event	4th International Conference on Nanostructures Self-Assembly (NANOSEA) - , Italy Duration: 25-Jun-2012 → 29-Jun-2012

Keywords

Single-wall carbon nanotubes
Time resolved optical spectroscopy
Excitons
RAMAN-SPECTROSCOPY

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title = "Transient reflectivity on vertically aligned single-wall carbon nanotubes",

abstract = "One-color transient reflectivity measurements are carried out on two different samples of vertically aligned single-wall carbon nanotube bundles and compared with the response recently published on unaligned bundles. The negative sign of the optical response for both samples indicates that the free electron character revealed on unaligned bundles is only due to the intertube interactions favored by the tube bending. Neither the presence of bundles nor the existence of structural defects in aligned bundles is able to induce a free-electron like behavior of the photoexcited carriers. This result is also confirmed by the presence of non-linear excitonic effects in the transient response of the aligned bundles. (C) 2013 Elsevier B.V. All rights reserved.",

keywords = "Single-wall carbon nanotubes, Time resolved optical spectroscopy, Excitons, RAMAN-SPECTROSCOPY",

author = "Gianluca Galimberti and Stefano Ponzoni and Gabriele Ferrini and Stephan Hofmann and Muhammad Arshad and Cinzia Cepek and Stefania Pagliara",

year = "2013",

month = sep,

day = "30",

doi = "10.1016/j.tsf.2013.02.133",

language = "English",

volume = "543",

pages = "51--55",

journal = "Thin Solid Films",

issn = "0040-6090",

publisher = "Elsevier Science",

note = "4th International Conference on Nanostructures Self-Assembly (NANOSEA) ; Conference date: 25-06-2012 Through 29-06-2012",

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T1 - Transient reflectivity on vertically aligned single-wall carbon nanotubes

AU - Galimberti, Gianluca

AU - Ponzoni, Stefano

AU - Ferrini, Gabriele

AU - Hofmann, Stephan

AU - Arshad, Muhammad

AU - Cepek, Cinzia

AU - Pagliara, Stefania

PY - 2013/9/30

Y1 - 2013/9/30

N2 - One-color transient reflectivity measurements are carried out on two different samples of vertically aligned single-wall carbon nanotube bundles and compared with the response recently published on unaligned bundles. The negative sign of the optical response for both samples indicates that the free electron character revealed on unaligned bundles is only due to the intertube interactions favored by the tube bending. Neither the presence of bundles nor the existence of structural defects in aligned bundles is able to induce a free-electron like behavior of the photoexcited carriers. This result is also confirmed by the presence of non-linear excitonic effects in the transient response of the aligned bundles. (C) 2013 Elsevier B.V. All rights reserved.

AB - One-color transient reflectivity measurements are carried out on two different samples of vertically aligned single-wall carbon nanotube bundles and compared with the response recently published on unaligned bundles. The negative sign of the optical response for both samples indicates that the free electron character revealed on unaligned bundles is only due to the intertube interactions favored by the tube bending. Neither the presence of bundles nor the existence of structural defects in aligned bundles is able to induce a free-electron like behavior of the photoexcited carriers. This result is also confirmed by the presence of non-linear excitonic effects in the transient response of the aligned bundles. (C) 2013 Elsevier B.V. All rights reserved.

KW - Single-wall carbon nanotubes

KW - Time resolved optical spectroscopy

KW - Excitons

KW - RAMAN-SPECTROSCOPY

U2 - 10.1016/j.tsf.2013.02.133

DO - 10.1016/j.tsf.2013.02.133

M3 - Article

SN - 0040-6090

VL - 543

SP - 51

EP - 55

JO - Thin Solid Films

JF - Thin Solid Films

T2 - 4th International Conference on Nanostructures Self-Assembly (NANOSEA)

Y2 - 25 June 2012 through 29 June 2012

ER -

Transient reflectivity on vertically aligned single-wall carbon nanotubes

Abstract

Keywords

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