Journal
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
Volume 22, Issue 19, Pages -Publisher
MDPI
DOI: 10.3390/ijms221910595
Keywords
self-assembly; metallic nanoparticles; plasmonic modes; simulations; surface charge mappings; full-width three-quarter maximum
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2021R1I1A1A01050424, 2020R1I1A1A01069244, 2020R1A6A3A01095799, 2020R1A2C2011090]
- National Research Foundation of Korea [2021R1I1A1A01050424, 2020R1A6A3A01095799, 2020R1A2C2011090, 2020R1I1A1A01069244] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This study demonstrates the significance of the shape and surface morphology of plasmonic nanoparticles in achieving efficient self-assembled plasmonic nanoparticle clusters. Spherical nanoparticles show better near-field strength and broad-spectral optical performance compared to cubical nanoparticles, attributed to their dipole mode characteristics.
We reveal the significance of plasmonic nanoparticle's (NP) shape and its surface morphology en route to an efficient self-assembled plasmonic nanoparticle cluster. A simplified model is simulated in the form of free-space dimer and trimer nanostructures (NPs in the shape of a sphere, cube, and disk). A ~200% to ~125% rise in near-field strength (gap mode enhancement) is observed for spherical NPs in comparison with cubical NPs (from 2 nm to 8 nm gap sizes). Full-width three-quarter maximum reveals better broad-spectral optical performance in a range of ~100 nm (dimer) and ~170 nm (trimer) from spherical NPs as compared to a cube (~60 nm for dimer and trimer). These excellent properties for sphere-based nanostructures are merited from its dipole mode characteristics.
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