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Fluorescence and Phosphorescence: Instrumentation01:25

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A time-temperature integrator based on fluorescent and polymorphic compounds.

Denis Gentili1, Margherita Durso, Cristian Bettini

  • 1Consiglio Nazionale delle Ricerche-Istituto per lo studio dei Materiali Nanostrutturati (CNR- ISMN), via P. Gobetti 101, 40129 Bologna, Italy.

Scientific Reports
|September 5, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces polymorphic molecular fluorescent thin films as novel time temperature integrators. These films change color irreversibly to record thermal history, offering a new method for monitoring product temperatures.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physical Chemistry

Background:

  • Molecular materials offer diverse functionalities but suffer from aggregation and polymorphism in thin films, hindering applications.
  • Time temperature integrators are crucial for monitoring thermal history in various products.

Purpose of the Study:

  • To develop polymorphic molecular fluorescent thin films for use as time temperature integrators.
  • To demonstrate the application of these films in recording thermal exposure history.

Main Methods:

  • Fabrication of thin films using a patterned fluorescent model compound, thieno(bis)imide-oligothiophene.
  • Utilizing irreversible, temperature-driven phase variations in the thin film to alter fluorescence color.
  • Quantitative analysis of experimental results in the 20-200°C range.

Main Results:

  • The fluorescence color of the patterned thin films changes irreversibly with temperature exposure.
  • The observed color change is quantitatively analyzed and attributed to polymorph recrystallization.
  • The developed device effectively reveals the temperature at which the pattern was exposed.

Conclusions:

  • Polymorphic molecular fluorescent thin films can serve as effective time temperature integrators.
  • The method is based on irreversible, temperature-dependent changes in fluorescence.
  • This approach is broadly applicable to compounds exhibiting similar temperature-responsive fluorescence behavior.