UiO-66(Zr) : Tb3+, Eu3+/PVDF Composite Films as Dual-Responsive Optical Thermometers for Wide-Range Temperature
Ipshita Majumdar1, Ashok K Ganguli1,2
1Department of Chemistry, Indian Institute of Technology Delhi, New Delhi, 110016, India.
Chemistry, an Asian Journal
|February 27, 2025
Summary
We developed novel nanothermometers using Tb3+ and Eu3+ doped UiO-66(Zr) metal-organic frameworks. These advanced optical thermometers show high sensitivity across a wide temperature range, from cryogenic to physiological and beyond.
Area of Science:
- Materials Science
- Nanotechnology
- Analytical Chemistry
Background:
- Nanothermometers are crucial for nanoscale temperature measurement in diverse fields.
- Fluorescence-based optical thermometers using Tb3+ and Eu3+ offer self-referenced detection but often lack sensitivity at higher temperatures.
- Existing lanthanide thermometers have limited applicability beyond cryogenic temperatures.
Purpose of the Study:
- To synthesize Tb3+, Eu3+ codoped UiO-66(Zr) metal-organic frameworks for enhanced nanothermometry.
- To investigate the thermal sensitivity of these nanothermometers over a broad temperature range.
- To develop a flexible composite material for thermometry in fluid environments.
Main Methods:
- One-pot microemulsion synthesis of highly crystalline Tb3+, Eu3+ codoped UiO-66(Zr) metal-organic frameworks.
- Ratiometric fluorescence detection utilizing Tb3+-Eu3+ energy transfer for temperature sensing.
- Fabrication of nanoparticle-PVDF composite films for application in liquid media.
Main Results:
- The synthesized nanothermometers exhibit high thermal sensitivity from cryogenic to physiological temperatures and beyond.
- UiO-66(Zr) framework ensures stability, and Tb3+-Eu3+ codoping enables precise, non-blinking ratiometric detection.
- Superior performance at 400 K compared to lanthanide-terephthalate frameworks; retained sensitivity in PVDF composite films in isopropyl alcohol.
Conclusions:
- A simple, one-pot method for incorporating lanthanides into UiO-66(Zr) for advanced optical thermometry was established.
- These nanothermometers demonstrate significant potential for applications in biological and industrial systems requiring wide-range temperature monitoring.
- The developed composite films offer a pathway for thermometry in fluid environments.
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