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Plasmonic Multi-Layered Built-in Hotspots Nanogaps for Effectively Activating Analytes.
Lei Jiang1, Xiaoyuan Wang1, Jingyi Zhou1
1College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou, Zhejiang, 311121, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 3, 2023
Summary
Researchers developed multi-layered plasmonic nanostructures (multi-Au@Ag-Au NPs) for enhanced analyte detection. These novel nanoparticles exhibit strong electromagnetic field confinement and high sensitivity, advancing Surface-Enhanced Raman Spectroscopy (SERS) applications.
Area of Science:
- Plasmonics
- Nanotechnology
- Surface Chemistry
Background:
- Multi-layered plasmonic nanostructures are crucial for near-field confinement and analyte activation.
- Achieving high performance in these nanostructures presents significant challenges.
Purpose of the Study:
- To develop semi-open Au core@carved AuAg multi-shell superstructure nanoparticles (multi-Au@Ag-Au NPs) with tunable electromagnetic fields and analyte-capturing capabilities.
- To investigate the plasmonic properties and sensing performance of these novel nanostructures.
Main Methods:
- Synthesis of multi-Au@Ag-Au NPs with varying layer numbers (mono to penta) through controlled galvanic exchange and silver growth.
- Characterization of nanoparticle structure, including asymmetric nanoholes and internal nanogaps.
- Evaluation of electromagnetic field enhancement and light-harvesting capabilities.
- Assessment of sensing performance using Surface-Enhanced Raman Spectroscopy (SERS).
Main Results:
- Successfully synthesized multi-Au@Ag-Au NPs with tunable layer numbers and asymmetric nanoholes.
- Achieved significant electromagnetic field enhancement (up to 48841 for penta-Au@Ag-Au NPs) due to collective plasmon oscillations.
- Demonstrated remarkable, laser-adaptive light-harvesting capability for high-diversity detection.
- Attained highly sensitive detection with a limit of detection as low as 3.22 × 10-12 M due to structural specificity and interior hotspots.
Conclusions:
- The study presents a novel pathway for creating plasmonic superstructures with integrated hotspots for effective analyte activation.
- The developed multi-Au@Ag-Au NPs offer a promising platform for highly sensitive and diverse SERS detection.
- This work stimulates advancements in SERS substrates for a wide range of applications.
