Cellulose-Based Fluorescent Material for Extreme pH Sensing and Smart Printing Applications

Area of Science:

• Materials Science
• Analytical Chemistry
• Biotechnology

Background:

• Environment-responsive fluorescence materials are crucial for instrument-free environmental monitoring.
• Developing eco-friendly, cellulose-based fluorescent sensors for extreme pH remains a challenge.

Purpose of the Study:

• To develop a highly fluorescent and multifunctional cellulose-based material for extreme pH sensing.
• To create a ratiometric sensing system for precise differentiation of extreme acidic and alkaline conditions.

Main Methods:

• Chemically bonding luminol onto cellulose acetate using MDI as a cross-linker to create Lum-MDI-CA.
• Characterization using UV-vis, FTIR, NMR, and fluorescence spectroscopy.
• Fabrication into transparent flexible films for additional applications.

Main Results:

• The Lum-MDI-CA material exhibits excellent aqua blue fluorescence.
• A ratiometric method using MTPP reference clearly differentiates extreme pH values (e.g., pH 1 vs. 2, pH 12-14).
• The material shows potential for UV shielding, security printing, and smart food packaging.

Conclusions:

• A novel, eco-friendly cellulose acetate-based fluorescent material (Lum-MDI-CA) was successfully synthesized.
• The developed ratiometric sensor enables visual and fluorescence-based detection of extreme pH levels.
• The material's versatility extends to applications in smart packaging and security printing.