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Quantum Confined High-Entropy Lanthanide Oxysulfide Colloidal Nanocrystals
Brendan Ward-O'Brien1, Paul D McNaughter2, Rongsheng Cai1
1Department of Materials, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
Nano Letters
|October 4, 2022
Summary
Researchers created novel quantum confined high-entropy nanoparticles using lanthanide oxysulfides. These nanoparticles exhibit unique optical properties due to their small size and uniform elemental distribution, indicating quantum confinement effects.
Area of Science:
- Materials Science
- Nanotechnology
- Quantum Physics
Background:
- High-entropy (HE) materials offer unique properties due to their complex compositions.
- Lanthanide oxysulfides (Ln2SO2) are explored as host materials for novel functionalities.
- Quantum confinement effects in nanomaterials lead to altered optical and electronic properties.
Purpose of the Study:
- To synthesize and characterize the first quantum confined high-entropy (HE) nanoparticles.
- To investigate the influence of size and composition on the optical properties of HE lanthanide oxysulfides.
- To confirm quantum confinement effects through spectroscopic and theoretical analysis.
Main Methods:
- Simultaneous thermolysis of lanthanide dithiocarbamate precursors in solution.
- Powder X-ray diffraction (PXRD) for phase analysis.
- High-resolution scanning transmission electron microscopy (HR-STEM) with energy dispersive X-ray spectroscopy (EDS) for compositional mapping.
- UV-Vis absorption and photoluminescence spectroscopy.
- Theoretical calculations of bandgap energy and exciton Bohr radii.
Main Results:
- Successfully synthesized uniform HE nanoparticles of Ln2SO2 (equimolar Pr, Nd, Gd, Dy, Er).
- Confirmed uniform distribution of lanthanides within nanoparticles via EDS mapping.
- Observed a significant blue shift in absorption (edge 330 nm, λmax 410 nm) and photoluminescence spectra compared to bulk material.
- Spectroscopic data and theoretical analysis support quantum confinement effects due to size, strain, and surface effects.
Conclusions:
- Demonstrated the successful synthesis of quantum confined HE nanoparticles in the lanthanide oxysulfide system.
- Established a correlation between nanoparticle size, composition, and altered optical properties.
- Provided evidence for quantum confinement in these novel HE nanomaterials, opening avenues for advanced optical applications.
