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Luminescence Nanothermometry: Investigating Thermal Memory in UiO-66-NH2 Nanocrystals.
Nour Merhi1, Abdullah Hakeem1, Mohamad Hmadeh1
1Chemistry Department, American University of Beirut, P.O. Box 11-0236, Beirut 1107 2020, Lebanon.
ACS Applied Materials & Interfaces
|July 10, 2024
Summary
Amino-functionalized zirconium metal-organic frameworks (MOFs) show enhanced fluorescence when heated, a property that persists after cooling. This discovery opens doors for novel photonic applications and understanding MOF-environment interactions.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Metal-organic frameworks (MOFs) are versatile crystalline materials with broad application potential.
- Amino-functionalized UiO-66-NH2 MOFs possess unique chemical and physical characteristics.
- Understanding MOF photophysics is crucial for advanced material design.
Purpose of the Study:
- To investigate the novel temperature-dependent fluorescence enhancement in UiO-66-NH2 nanocrystals.
- To elucidate the underlying mechanisms responsible for the observed fluorescence changes.
- To explore potential applications of this thermochromic photophysical behavior.
Main Methods:
- Steady-state fluorescence spectroscopy
- Fluorescence lifetime measurements
- Fluorescence microscopy
Main Results:
- UiO-66-NH2 nanocrystals exhibited a significant and persistent fluorescence enhancement upon heating.
- Heating induced MOF disaggregation and surface phenomena, contributing to fluorescence increase.
- The enhanced fluorescence was maintained even after the material cooled down.
Conclusions:
- UiO-66-NH2 displays a unique, persistent, temperature-dependent fluorescence enhancement.
- Disaggregation and surface effects are key mechanisms driving the observed photophysical changes.
- This finding offers new avenues for thermally modulated photonic applications and MOF-environment studies.
