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Nanopore fabrication by heating Au particles on ceramic substrates
Lennart J de Vreede1, Albert van den Berg, Jan C T Eijkel
1MESA+ Institute for Nanotechnology, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente , Drienerlolaan 5, 7522 NB Enschede, The Netherlands.
Nano Letters
|December 31, 2014
Summary
Gold nanoparticles move into amorphous substrates when heated near melting point. This process, driven by gold evaporation and capillary forces, creates deep nanopores and can be controlled by temperature and substrate selection.
Area of Science:
- Materials Science
- Nanotechnology
- Surface Science
Background:
- Understanding nanoparticle-substrate interactions is crucial for nanotechnology.
- Controlling nanoparticle behavior at elevated temperatures presents unique challenges.
Purpose of the Study:
- To investigate the perpendicular movement of gold nanoparticles into amorphous substrates.
- To elucidate the mechanisms driving nanoparticle penetration and nanopore formation.
Main Methods:
- Heating gold nanoparticles on amorphous silicon dioxide (SiO2) and silicon nitride (Si3N4) substrates.
- Observing nanoparticle behavior and nanopore characteristics at temperatures near the melting point of gold.
Main Results:
- Gold nanoparticles moved perpendicularly into SiO2 and Si3N4 substrates upon heating.
- Nanopores with extreme aspect ratios (diameter ~25 nm, length up to 800 nm) were formed.
- Particle burial was observed depending on applied temperatures.
Conclusions:
- The observed phenomenon is driven by gold evaporation and modulated by capillary forces.
- Temperature programming and substrate choice are key parameters for controlling the process.
- This controlled nanopore formation offers potential applications in nanofabrication.
