Fluorescence switch in red-phase polydiacetylene films and vesicles upon thermal cycles

Chunzhi Cui, Hyun Choi, Gil Sun Lee, Dong June Ahn

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The switch phenomena of thermochromism of red-phase polymerized PCDA (10,12-pentacosadiynoic acid) Langmuir-Schaefer (LS) films and vesicles were investigated in situ during repeated heating and cooling processes between 25 °C and 70 °C. During repeated thermal cycles, the solid-supported LS films exhibited switch phenomena in both the visible and fluorescent spectra, that is, the colorimetric response (CR) of the PCDA LS films was ca. 80% at 70 °C but is ca. 50∼60% at 25 °C with an increase of fluorescent intensity in the cooling process and a decrease in the heating process. On the other hand, the PCDA vesicles exhibited such phenomenon only in the fluorescent spectra, that is, the CR of the PCDA vesicles was constant as ca. 100% after being stable red form with the same trend in the fluorescent intensity. The changes in molecular configuration revealed by in situ Fourier transform infrared (FTIR) were in good agreement with the trend of fluorescence emission upon repeated thermal stimuli rather than that of visible absorption.

Original languageEnglish
Pages (from-to)5754-5760
Number of pages7
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number7
DOIs
Publication statusPublished - 2011 Jul 1

Fingerprint

Langmuir Blodgett films
switches
Hot Temperature
Fluorescence
Switches
fluorescence
cycles
acids
Acids
Heating
Cooling
Molecular Conformation
trends
cooling
heating
Industrial heating
Fourier Analysis
visible spectrum
stimuli
Fourier transforms

Keywords

  • Fluorescence Switch
  • Photopolymerization
  • Polydiacetylenes
  • Thermochromism

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)
  • Bioengineering
  • Biomedical Engineering

Cite this

Fluorescence switch in red-phase polydiacetylene films and vesicles upon thermal cycles. / Cui, Chunzhi; Choi, Hyun; Lee, Gil Sun; Ahn, Dong June.

In: Journal of Nanoscience and Nanotechnology, Vol. 11, No. 7, 01.07.2011, p. 5754-5760.

Research output: Contribution to journalArticle

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