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Designing Hybrid Plasmonic Superlattices with Spatially Confined Responsive Heterostructural Units
Jianxi Liu1, Haowen Luo1, Zhihuan Li1
1State Key Laboratory of Solidification Processing, Center of Advanced Lubrication and Seal Materials, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, P.R. China.
Nano Letters
|January 3, 2025
Summary
We developed a novel plasmonic superlattice using metal-organic frameworks (MOFs) and polyelectrolytes for tunable optical properties. This enables ultrafast chemical sensing with high sensitivity by manipulating electromagnetic fields.
Area of Science:
- Nanotechnology
- Materials Science
- Chemical Sensing
Background:
- Plasmonic superlattices offer nanoscale electromagnetic field control but lack reconfigurable optical properties.
- Existing static lattices are limited by fixed geometry, hindering dynamic applications.
Purpose of the Study:
- To engineer a reconfigurable plasmonic superlattice for tunable plasmon resonance.
- To achieve ultrafast chemical sensing with enhanced sensitivity.
Main Methods:
- Fabrication of a surface-interface engineered plasmonic superlattice using electron-beam lithography.
- Grafting humidity-responsive polyelectrolyte brushes onto gold nanoparticles via atom transfer radical polymerization.
- Assembly of metal-organic framework (MOF) thin films on the functionalized nanoparticle lattice.
Main Results:
- Achieved tunable surface lattice resonance in the visible spectrum.
- Demonstrated resonance tuning by adjusting polyelectrolyte layer thickness and refractive index.
- Observed high chemical sensitivity and ultrafast response attributed to MOF-polymer layer coherence.
Conclusions:
- The developed hybrid plasmonic superlattice allows for dynamic tuning of optical properties.
- This platform is suitable for developing highly sensitive and rapid chemical sensors.
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