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Probing quantum plasmon coupling using gold nanoparticle dimers with tunable interparticle distances down to the
Hoon Cha1, Jun Hee Yoon, Sangwoon Yoon
1Department of Chemistry, Dankook University , 152 Jukjeon-ro, Suji-gu, Yongin, Gyeonggi 448-701, Korea.
ACS Nano
|August 5, 2014
Summary
We developed a novel method to assemble gold nanoparticles (AuNPs) into dimers with high yield. This technique allows precise control over interparticle distance, revealing quantum tunneling effects in subnanometer gaps.
Area of Science:
- Nanotechnology
- Plasmonics
- Surface Science
Background:
- Controlling plasmonic properties of nanostructures is crucial.
- Noble metal nanoparticle assemblies, especially dimers, offer fundamental insights into nanoparticle interactions.
- Existing assembly methods often lack efficiency and precise control.
Purpose of the Study:
- To develop a highly efficient and facile method for assembling gold nanoparticle (AuNP) dimers.
- To investigate the influence of interparticle distance on surface plasmon coupling.
- To explore the role of quantum tunneling in subnanometer gaps.
Main Methods:
- Utilized a masked desilanization technique on aminosilanized glass surfaces.
- Assembled AuNPs, achieving homodimers with high yield (∼90%).
- Tuned interparticle distances using alkanedithiol self-assembled monolayers.
Main Results:
- Demonstrated tunable surface plasmon coupling by controlling interparticle distance.
- Observed a redshift in surface plasmon coupling with decreasing distance, consistent with classical models.
- Identified a blueshift and broadening of the resonance band in the subnanometer regime, attributed to quantum tunneling.
Conclusions:
- The masked desilanization method enables efficient AuNP dimer formation with controlled interparticle gaps.
- Quantum tunneling significantly impacts the plasmonic response of AuNP dimers at subnanometer separations.
- This assembly strategy is versatile for creating diverse nanoassemblies, advancing the understanding of plasmonic interactions.
