Femtosecond transient absorption spectroscopy of nanocrystalline polydiacetylene colloids

Tsuyoshi Asahi; Kazumasa Kibisako; Hiroshi Masuhara; Hitoshi Kasai; Hideyuki Katagi; Hidetoshi Oikawa; Hachiro Nakanishi

doi:10.1080/10587259808042462

Femtosecond transient absorption spectroscopy of nanocrystalline polydiacetylene colloids

Tsuyoshi Asahi^*, Kazumasa Kibisako, Hiroshi Masuhara, Hitoshi Kasai, Hideyuki Katagi, Hidetoshi Oikawa, Hachiro Nakanishi

^*Corresponding author for this work

Department of Applied Chemistry

Research output: Contribution to journal › Conference article › peer-review

8 Scopus citations

Abstract

Femtosecond transient absorption spectral measurements have been performed for size-controlled polydiacetylene microcrystals (30, 100, and 150 nm mean diameter) dispersed in water. Ultrafast relaxation processes within 5 ps after excitation were attributed to formation and decay of self-trapped exciton, which was independent on the size. A time-dependent spectral shift of transient bleaching, corresponding to the stationary excitonic absorption band, was observed in the time region from 10 ps to a few ns. It is explained as a thermalization of absorbed light energy within the microcrystal and the succeeding cooling by comparing transient absorption spectra with temperature difference spectra of the ground state absorption. Size-dependent cooling dynamics of a 'hot' microcrystal was successfully demonstrated; the time constant increases with the crystal size.

Original language	English
Pages (from-to)	95-100
Number of pages	6
Journal	Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals
Volume	314
DOIs	https://doi.org/10.1080/10587259808042462
State	Published - 1 Jan 1998
Event	Proceedings of the 1998 TAPPI Metered Size Press Forum - New Orleans, LA, USA Duration: 30 Apr 1998 → 2 May 1998

Keywords

Cooling dynamics
Femtosecond absorption spectroscopy
Microcrystals
Polydiacetylene
Size dependence

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Asahi, Tsuyoshi ; Kibisako, Kazumasa ; Masuhara, Hiroshi ; Kasai, Hitoshi ; Katagi, Hideyuki ; Oikawa, Hidetoshi ; Nakanishi, Hachiro. / Femtosecond transient absorption spectroscopy of nanocrystalline polydiacetylene colloids. In: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals. 1998 ; Vol. 314. pp. 95-100.

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title = "Femtosecond transient absorption spectroscopy of nanocrystalline polydiacetylene colloids",

abstract = "Femtosecond transient absorption spectral measurements have been performed for size-controlled polydiacetylene microcrystals (30, 100, and 150 nm mean diameter) dispersed in water. Ultrafast relaxation processes within 5 ps after excitation were attributed to formation and decay of self-trapped exciton, which was independent on the size. A time-dependent spectral shift of transient bleaching, corresponding to the stationary excitonic absorption band, was observed in the time region from 10 ps to a few ns. It is explained as a thermalization of absorbed light energy within the microcrystal and the succeeding cooling by comparing transient absorption spectra with temperature difference spectra of the ground state absorption. Size-dependent cooling dynamics of a 'hot' microcrystal was successfully demonstrated; the time constant increases with the crystal size.",

keywords = "Cooling dynamics, Femtosecond absorption spectroscopy, Microcrystals, Polydiacetylene, Size dependence",

author = "Tsuyoshi Asahi and Kazumasa Kibisako and Hiroshi Masuhara and Hitoshi Kasai and Hideyuki Katagi and Hidetoshi Oikawa and Hachiro Nakanishi",

year = "1998",

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volume = "314",

pages = "95--100",

journal = "Molecular Crystals and Liquid Crystals",

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Femtosecond transient absorption spectroscopy of nanocrystalline polydiacetylene colloids. / Asahi, Tsuyoshi; Kibisako, Kazumasa; Masuhara, Hiroshi; Kasai, Hitoshi; Katagi, Hideyuki; Oikawa, Hidetoshi; Nakanishi, Hachiro.

In: Molecular Crystals and Liquid Crystals Science and Technology Section A: Molecular Crystals and Liquid Crystals, Vol. 314, 01.01.1998, p. 95-100.

Research output: Contribution to journal › Conference article › peer-review

TY - JOUR

T1 - Femtosecond transient absorption spectroscopy of nanocrystalline polydiacetylene colloids

AU - Asahi, Tsuyoshi

AU - Kibisako, Kazumasa

AU - Masuhara, Hiroshi

AU - Kasai, Hitoshi

AU - Katagi, Hideyuki

AU - Oikawa, Hidetoshi

AU - Nakanishi, Hachiro

PY - 1998/1/1

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N2 - Femtosecond transient absorption spectral measurements have been performed for size-controlled polydiacetylene microcrystals (30, 100, and 150 nm mean diameter) dispersed in water. Ultrafast relaxation processes within 5 ps after excitation were attributed to formation and decay of self-trapped exciton, which was independent on the size. A time-dependent spectral shift of transient bleaching, corresponding to the stationary excitonic absorption band, was observed in the time region from 10 ps to a few ns. It is explained as a thermalization of absorbed light energy within the microcrystal and the succeeding cooling by comparing transient absorption spectra with temperature difference spectra of the ground state absorption. Size-dependent cooling dynamics of a 'hot' microcrystal was successfully demonstrated; the time constant increases with the crystal size.

AB - Femtosecond transient absorption spectral measurements have been performed for size-controlled polydiacetylene microcrystals (30, 100, and 150 nm mean diameter) dispersed in water. Ultrafast relaxation processes within 5 ps after excitation were attributed to formation and decay of self-trapped exciton, which was independent on the size. A time-dependent spectral shift of transient bleaching, corresponding to the stationary excitonic absorption band, was observed in the time region from 10 ps to a few ns. It is explained as a thermalization of absorbed light energy within the microcrystal and the succeeding cooling by comparing transient absorption spectra with temperature difference spectra of the ground state absorption. Size-dependent cooling dynamics of a 'hot' microcrystal was successfully demonstrated; the time constant increases with the crystal size.

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KW - Femtosecond absorption spectroscopy

KW - Microcrystals

KW - Polydiacetylene

KW - Size dependence

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