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Polymer/AgPt bimetallic nanoparticle synergy: optimizing plasmonic durability through controlled synthesis and matrix
Abeer Fahes1, Lavinia Balan2, Caroline Andreazza-Vignolle1
1Université d'Orléans, CNRS, ICMN, UMR 7374 Orléans France abeer.fahes@cnrs-orleans.fr pascal.andreazza@univ-orleans.fr.
Nanoscale Advances
|May 29, 2025
Summary
Researchers developed a new method to create tiny silver-platinum bimetallic nanoparticles (BNPs) in a polymer matrix. This technique offers better control and stability for nanoparticles, enhancing their plasmonic properties for applications like SERS and solar cells.
Area of Science:
- Materials Science
- Nanotechnology
- Polymer Science
Background:
- Conventional methods for synthesizing bimetallic nanoparticles (BNPs) often struggle with controlling size, uniformity, and stability within polymer matrices.
- Porous polymer strategies can lead to aggregation and loss of desired nanoparticle properties during processing.
Purpose of the Study:
- To develop an innovative method for synthesizing and dispersing 2-3 nm AgPt BNPs within a non-porous polymer matrix.
- To achieve unprecedented control over nanoparticle structural properties, spatial arrangement, and size uniformity.
- To enhance the stability and plasmonic properties of AgPt BNPs for advanced applications.
Main Methods:
- Combining UV-induced polymerization with ultra-high vacuum (UHV) atomic vapor deposition to synthesize AgPt BNPs.
- Utilizing a non-porous poly(dipropylene glycol diacrylate) (PDGDA) matrix for nanoparticle embedding and stabilization.
- Employing high-temperature annealing (up to 320 °C) to accelerate nanoparticle confinement and diffusion within the polymer.
Main Results:
- Successfully synthesized and dispersed 2-3 nm AgPt BNPs with low dispersity (σD/D = 0.16) in a non-porous PDGDA matrix.
- Demonstrated enhanced nanoparticle stability and maintained small sizes during high-temperature annealing due to steric stabilization and controlled diffusion.
- Achieved near-instantaneous nanoparticle incorporation upon heating, significantly reducing embedding time compared to room temperature methods.
- Observed significantly stronger localized surface plasmon resonances (LSPRs) in AgPt BNPs compared to pure platinum nanoparticles due to synergistic metal effects.
Conclusions:
- The developed UV-polymerization and UHV deposition method offers superior control over AgPt BNP synthesis and dispersion in a non-porous matrix.
- The PDGDA matrix plays a crucial role in stabilizing nanoparticles and enabling rapid, high-temperature confinement.
- Enhanced LSPR properties of AgPt BNPs highlight their potential for advanced plasmonic applications, including SERS and solar cells.
