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Analysis and Optimization of Rotationally Symmetric Au-Ag Alloy Nanoparticles for Refractive Index Sensing Properties
Long Cheng1, Shuhong Gong1, Paerhatijiang Tuersun2
1School of Physics, Xidian University, Xi'an 710071, China.
Nanomaterials (Basel, Switzerland)
|July 12, 2025
Summary
This study optimized gold-silver alloy nanorods for biosensing, achieving high refractive index sensitivity and figure of merit. These findings guide the development of advanced, non-spherical nanoparticle biosensors.
Area of Science:
- Nanotechnology
- Materials Science
- Biomedical Engineering
Background:
- Non-spherical nanoparticles are crucial for biosensing, with research focusing on shape optimization and size parameters.
- Gold-silver (Au-Ag) alloy nanoparticles offer excellent optical properties for refractive index sensing.
Purpose of the Study:
- To systematically analyze and optimize rotationally symmetric Au-Ag alloy nanoparticles for biosensing applications.
- To determine optimal size parameters and gold molar fractions for enhanced figure of merit.
Main Methods:
- Utilized complex media function correction model and T-matrix approach.
- Analyzed extinction properties, refractive index sensitivity, FWHM, and figure of merit.
- Optimized figure of merit for Au-Ag alloy nanostructures.
Main Results:
- Optimized Au-Ag alloy nanorods demonstrated a refractive index sensitivity of 395.2 nm/RIU and a figure of merit of 7.16.
- Identified optimal size parameters and Au molar fractions for enhanced sensing performance.
- Calculated dimensional parameter ranges yielding >98% of maximum figure of merit.
Conclusions:
- Optimized Au-Ag alloy nanorods are suitable for high-performance biosensor applications.
- The study provides theoretical guidance for fabricating and utilizing these nanoparticles in biosensing.
