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Published on: October 16, 2017
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Liquid lasing from solutions of ligand-engineered semiconductor nanocrystals
Max J H Tan1, Shreya K Patel1, Jessica Chiu2
1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, USA.
The Journal of Chemical Physics
|April 16, 2024
Summary
Ligand-engineered semiconductor nanocrystals (NCs) achieve liquid lasing in plasmonic cavities. This enables ion detection by monitoring lasing thresholds, paving the way for lab-on-chip biosensing platforms.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Semiconductor nanocrystals (NCs) exhibit tunable optical properties influenced by surface ligands.
- Ligand-environment interactions in solution affect NC optical responses.
- Achieving sufficient optical gain for lasing is hindered by colloidal instability at high NC concentrations.
Purpose of the Study:
- To demonstrate liquid lasing from plasmonic lattice cavities using ligand-engineered NCs.
- To utilize NC aggregation for ion detection via lasing threshold changes.
- To establish NC-plasmonic lattice systems as a biosensing platform for lab-on-chip devices.
Main Methods:
- Integration of ligand-engineered Cadmium Zinc Sulfide/Zinc Sulfide (CdZnS/ZnS) NCs into plasmonic lattice cavities.
- Dispersion of NCs in both toluene and aqueous solutions.
- Induction of NC aggregation in aqueous solutions using calcium ions to modulate optical properties.
Main Results:
- Successful demonstration of liquid lasing from the integrated NC-plasmonic lattice system.
- Lasing threshold was observed to change with calcium ion concentration, indicating ion detection capability.
- The system showed potential for sensitive optical response amplification.
Conclusions:
- Ligand engineering of semiconductor nanocrystals enables stable liquid lasing.
- Plasmonic lattice cavities enhance NC gain and facilitate optical transduction.
- This approach offers a promising route for developing sensitive biosensors on lab-on-chip platforms.
