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Binary Plasmonic Assembly Films with Hotspot-Type-Dependent Surface-Enhanced Raman Scattering Properties.

Shuang Lin¹, Haoyu Guan¹, Yuqi Liu¹

¹Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Key Laboratory of Photosensitive Materials&Devices of Liaoning Province, School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China.

ACS Applied Materials & Interfaces

|October 27, 2021

Summary

Controlling plasmon coupling in gold nanostructures enhances optical responses. A novel assembly of gold nanospheres and nanocubes created tunable "hot spots" for superior surface-enhanced Raman scattering (SERS) detection.

Keywords:

binary assembly film hotspot type plasmonic surface-enhanced Raman scattering

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Area of Science:

Nanotechnology
Materials Science
Physical Chemistry

Background:

Controlling plasmon coupling in noble metal nanoparticles is crucial for optimizing near-field and far-field optical responses.
Heterogeneous plasmonic assemblies offer tunable properties for advanced applications.

Purpose of the Study:

To propose and fabricate a novel heterogeneous plasmonic assembly with controllable hot spot configurations.
To investigate the impact of different hot spot conformations on localized surface plasmon resonance (LSPR) and surface-enhanced Raman scattering (SERS) performance.

Main Methods:

Co-assembly of gold nanospheres (Au NS) and gold@silver core-shell nanocube (Au@Ag NC) films.
Fabrication of three distinct hot spot configurations (point-to-point, point-to-facet, facet-to-facet) by adjusting nanoparticle doping ratios.
Finite-difference time-domain (FDTD) simulations to analyze plasmon coupling and electric field enhancement.

Main Results:

The study successfully fabricated heterogeneous plasmonic assemblies with tunable hot spot configurations.
Distinct LSPR properties and SERS performance were observed across different hot spot types.
The point-to-facet hot spot configuration demonstrated the most significant SERS enhancement compared to single-component assemblies.
The developed assemblies showed high sensitivity and reproducibility in identifying ketamine.

Conclusions:

Adjusting the doping ratio of nanoparticles in co-assembled films provides a simple method to control hot spot configurations.
Heterogeneous plasmonic assemblies with optimized hot spot designs significantly enhance SERS activity.
This work presents a new strategy for fabricating plasmonic materials with collective LSPR and sensitive SERS capabilities for molecular detection.