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A nanocellulose-dye conjugate for multi-format optical pH-sensing.

Prashant Chauhan1, Caroline Hadad, Ana Herreros López

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Researchers developed novel pH-sensitive nanostructured optodes using azo-dye grafted cellulose nanocrystals. These materials enable optical pH detection in various formats like membranes, sticks, and inks.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Analytical Chemistry

Background:

  • Optical sensors offer advantages for pH monitoring.
  • Cellulose nanocrystals (CNCs) provide a versatile nanomaterial platform.
  • Developing sensitive and stable pH indicators is crucial.

Purpose of the Study:

  • To create novel nanostructured optodes for optical pH detection.
  • To functionalize cellulose nanocrystals with a pH-sensitive azo-dye.
  • To demonstrate the utility of these optodes in different physical forms.

Main Methods:

  • Covalent grafting of an azo-dye onto cellulose nanocrystals.
  • Fabrication of nanostructured optodes (membranes, sticks, inks).
  • Characterization of the optode properties for pH sensing.

Main Results:

  • Successfully synthesized pH-sensitive azo-dye-grafted cellulose nanocrystals.
  • Developed nanostructured optodes exhibiting optical responses to pH changes.
  • Demonstrated optode functionality in membrane, stick, and ink formats.

Conclusions:

  • Azo-dye functionalized CNCs are effective for creating nanostructured optical pH sensors.
  • The developed optodes offer versatile platforms for optical pH detection.
  • This approach provides a new method for fabricating advanced sensing materials.