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Kinetically Encoded Microstrain Governs Growth, Electronic Structure, and Functionality in Microwave-Synthesized
Felipe Ribeiro de Vasconcelos1, Priscila Hasse Palharim1, Caroline Helena Claudino1
1Center for Natural and Humanities Sciences (CCNH), Federal University of ABC, Avenida dos Estados, 5001, Santo Andre, São Paulo 09210-170, Brazil.
ACS Omega
|May 25, 2026
Summary
Nonequilibrium synthesis using microwave heating kinetically encodes lattice microstrain in nanocrystals. This microstrain tunes optical properties and photocatalytic activity, offering a new route for designing functional oxide nanomaterials.
Area of Science:
- Materials Science
- Nanotechnology
- Solid State Chemistry
Background:
- Nonequilibrium synthesis offers access to metastable materials.
- Understanding the link between synthesis kinetics, defects, and material function is crucial.
- Microwave-assisted synthesis is a promising nonequilibrium technique.
Purpose of the Study:
- Investigate microwave-assisted synthesis of Eu3+ and Tb3+ doped Lu2O3 nanocrystals.
- Elucidate how nonequilibrium crystallization encodes lattice microstrain.
- Correlate microstrain with material properties and photocatalytic performance.
Main Methods:
- Time-resolved X-ray diffraction
- Transmission electron microscopy
- Kinetic modeling
- Williamson-Hall analysis
- Photoluminescence spectroscopy
Main Results:
- Diffusion-controlled crystallite growth (Ostwald ripening) with persistent microstrain.
- Dopant chemistry modulates microstrain, indicating coupling between defects and mass transport.
- Eu3+ emission directly tracks microstrain, while Tb3+ emission is quenched by defects.
- Photocatalytic activity is maximized at intermediate strain levels.
Conclusions:
- Microwave-assisted nonequilibrium synthesis kinetically encodes lattice microstrain.
- Lattice strain acts as an internal structural field tuning material properties.
- This provides a strategy for rational design of functional oxide nanomaterials via controlled growth pathways.
