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Spiropyran-based chromic hydrogels for CO

Arnau Marco1, Gonzalo Guirado1, Rosa María Sebastián1

  • 1Departament de Química, Universitat Autònoma de Barcelona, Cerdanyola del Vallès, Spain.

Frontiers in Chemistry
|June 8, 2023
PubMed
Summary
This summary is machine-generated.

New colorimetric CO2 sensors utilize spiropyran-functionalized hydrogels for selective and reusable carbon dioxide detection. These advanced sensors offer a promising solution for real-time monitoring applications.

Keywords:
CO2 detectionacidochromismhydrogelphotochromismspiropyran

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Area of Science:

  • Materials Science
  • Chemical Sensing
  • Polymer Chemistry

Background:

  • Colorimetric CO2 sensors offer rapid, cost-effective, and user-friendly in situ detection.
  • Developing optical chemosensors for CO2 with high sensitivity, selectivity, reusability, and solid-state integration remains challenging.

Purpose of the Study:

  • To develop novel spiropyran-based chromic hydrogels for selective and reversible colorimetric detection of carbon dioxide (CO2).
  • To investigate the integration of molecular switches into solid materials for enhanced CO2 sensing capabilities.

Main Methods:

  • Hydrogels were functionalized with spiropyrans, molecular switches exhibiting color changes in response to acid stimuli.
  • Polymerizable spiropyran derivatives were synthesized and incorporated into hydrogels.
  • Acidochromic responses were analyzed to assess selectivity against other acid gases like HCl.
  • The reversibility and quantification of CO2-induced color changes were evaluated.

Main Results:

  • Spiropyran-functionalized hydrogels demonstrated selective and reversible color changes upon exposure to CO2.
  • The acidochromic response of spiropyrans allowed discrimination of CO2 from other acid gases.
  • Visible light irradiation facilitated CO2 desorption, enabling sensor recovery and reuse.
  • The developed hydrogels showed quantifiable color changes correlating with CO2 concentrations.

Conclusions:

  • Spiropyran-based chromic hydrogels offer a promising platform for selective, reversible, and quantifiable colorimetric CO2 monitoring.
  • The facile integration into solid materials and light-assisted recovery enhance their applicability.
  • These sensors are suitable for diverse applications requiring in situ carbon dioxide detection.