Porous spherical gold nanoparticles via a laser induced process
Gabriele Schmidl1, Marc Raugust2,1, Guobin Jia1
1Leibniz Institute of Photonic Technology (Leibniz IPHT) Albert-Einstein-Straße 9 Jena 07745 Germany gabriele.schmidl@leibniz-ipht.de +49 (0) 3641 206299 +49 (0)3641 206438.
Nanoscale Advances
|October 26, 2022
Summary
We developed a new method to create porous gold nanoparticles using UV laser and etching. These nanoparticles have increased surface area, making them ideal for catalysis and drug delivery applications.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Chemistry
Background:
- Porous nanoparticles and mixed-metal nanoparticles offer unique properties for applications in catalysis and spectroscopic detection.
- Existing fabrication methods include top-down and bottom-up approaches.
Purpose of the Study:
- To present a novel, combined approach for fabricating spherical porous gold nanoparticles.
- To investigate the influence of fabrication parameters on nanoparticle properties and spectral response.
Main Methods:
- Utilized a UV-laser induced particle preparation process on a silver/gold bilayer system.
- Employed wet chemical selective etching using diluted nitric acid to remove silver.
- Analyzed nanoparticle composition using energy-dispersive X-ray spectroscopy.
Main Results:
- Successfully fabricated spherical porous gold nanoparticles on glass substrates under ambient conditions.
- Demonstrated that laser parameters, film thickness, and etching time influence nanoparticle porosity and gold-to-silver ratio.
- Observed an increase in surface area of gold nanoparticles after etching, altering localized plasmon resonances.
Conclusions:
- The developed method offers a cost-effective route to porous gold nanoparticles with tunable properties.
- Increased surface area makes these nanoparticles promising for advanced catalytic applications and as carrier particles for targeted substance delivery.
