Conformational changes of poly(3-alkylthiophene)s with temperature and pressure

Iwasaki, Kazuo; Fujimoto, Hitoshi; Matsuzaki, Susumu

doi:10.1016/0379-6779(94)90256-9

Cited by 54 publications

(53 citation statements)

References 32 publications

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“…A blue shift in the absorption peaks upon annealing P3HT NPs and films was reported in [16,21,22], which was associated with the decrease in the π-conjugation length in the polymer chain, and changes in the peak intensities with annealing were noted in [23,24]. In contrast, a redshift was observed in this study.…”

Section: Resultscontrasting

confidence: 54%

Tuning optical properties of poly(3-hexylthiophene) nanoparticles through hydrothermal processing

Lee

Park

et al. 2011

Science and Technology of Advanced Materials

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Poly(3-hexylthiophene) (P3HT) nanoparticles (NPs) were prepared by a reprecipitation method. Hydrothermal processing applied external pressure to the pristine P3HT NPs at temperatures ranging from 60 to 150• C. Optical absorption and photoluminescence (PL) spectra for the hydrothermally treated P3HT NPs varied markedly with the processing temperature. With increasing treatment temperature, the absorption peak broadened and the peak position shifted from 510 to 623 nm; moreover, the intensity ratio of the 0-1 to 0-0 emission varied. These changes were caused by interactions between the P3HT main chains and alkyl side groups and conformational modifications induced by the high pressure during the hydrothermal process. The evolution of the optical absorption spectra of the P3HT NPs during the hydrothermal processing was strongly correlated with the variation of PL excitation spectra and with the PL emission spectra of a single NP.

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Section: Resultscontrasting

confidence: 54%

Tuning optical properties of poly(3-hexylthiophene) nanoparticles through hydrothermal processing

Lee

Park

et al. 2011

Science and Technology of Advanced Materials

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“…On the other hand, the kinetics of this conformational transition are sometimes complicated by the presence of amorphous and crystalline phases in the macromolecules. Indeed, the transition temperature of the crystallites is expected to deviate from that of the A2.2 Optical Transducers 23 amorphous region and this effect can explain the absence of a clear isosbestic point during the thermochromic transition of some semicrystalline, regioregular, polythiophenes [60,61]. With some polythiophene derivatives, kinetic effects can even hinder the reversibility of the thermochromic transition; however, these irreversible thermochromic effects can be useful in thermal recording [62] and packaging applications.…”

Section: Thermochromism and Structural Aspectsmentioning

confidence: 99%

Optical and Electrochemical Transducers Based on Functionalized Conjugated Polymers

Leclerc

2000

Sensors Update

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“…account for the observed piezochromism in many σ-and π-conjugated polymers that have been reported (30)(31)(32)(33)(34)(35)(36)(37)(38).…”

Section: Piezochromic Polymersmentioning

confidence: 95%

“…Reversible piezochromism has been observed in regioregular and regiorandom poly(3-alkylthiophene)s (32)(33)(34)(35). Optical absorption spectra of solutions of poly(3-hexylthiophene) (P3HT) in toluene were observed to exhibit large bathochromic shifts with increasing hydrostatic pressure, compared to ambient pressure.…”

Section: Piezochromic Polymersmentioning

confidence: 97%

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Chromogenic Effects in Polymers: An Overview of the Diverse Ways of Tuning Optical Properties in Real Time

Jenekhe

Kiserow

2004

ACS Symposium Series

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In this overview chapter we introduce the subject of chromogenic phenomena in polymers and briefly review some of the recent advances in the field. Many external stimuli--responsive phenomena in polymers, including electrochromism, photochromism, photoelectrochromism, and piezochromism are discussed. Relatively new approaches to dynamic tunability of optical properties, such as mechanochromism, tunable electroluminescence and photonic band gap structures in polymers, are also discussed. There are good prospects that future advances in chromogenic polymers, particularly the integration of multiple chromogenic effects in the same material system, will usher in an era of "intelligent" materials for many technological applications.2

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Conformational changes of poly(3-alkylthiophene)s with temperature and pressure

Cited by 54 publications

References 32 publications

Tuning optical properties of poly(3-hexylthiophene) nanoparticles through hydrothermal processing

Tuning optical properties of poly(3-hexylthiophene) nanoparticles through hydrothermal processing

Optical and Electrochemical Transducers Based on Functionalized Conjugated Polymers

Chromogenic Effects in Polymers: An Overview of the Diverse Ways of Tuning Optical Properties in Real Time

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