□ About the Research
o A technology was developed to analyze the crystal and bonding structure of the synthesized hexagonal gold nanoplate particles using an Aberration-Corrected Transmission/Scanning Transmission Electron Microscopy in atomic units, and at the same time, a monochromated STEM-EELs was used to visualize the plasmon resonance energy (wavelength) and spatial distribution characteristics in nanoscale units.
o Four localized surface plasmon resonance (LSPR) modes with significantly different energies exist in a single hexagonal gold nanoplate particle, and the properties of these modes change with the geometry (shape, length, thickness) of the gold nanoplate particles.
o It was discovered for the first time that through the nanoscale strain mapping of hexagonal gold nanoplate particles with an asymmetrical surface plasmon resonance intensity distribution on both sides, tensile strain generated on one side significantly improved the local surface plasmon resonance intensity. This was consistent with the results predicted by computational simulation.
o In addition, it was confirmed at the atomic level that the large tensile strain that occurred on one side of the hexagonal gold nanoplate particles was caused by the Z-type faulted dipole generated near the boundary of the other crystal structure.
 
□ Research Results
Localized surface plasmon resonance (LSPR) induces a locally strong electromagnetic field enhancement and significantly improves optical properties. Various localized surface plasmon resonance modes and intensity distributions of single hexagonal gold nanoplate particles, which are not possible with current spectroscopic analysis methods, were first measured in nanoscale units by developing high energy resolution electron energy loss spectroscopy of transmission electron microscopy (TEM). In addition, through strain mapping, it was discovered for the first time in the world that tensile strain generated from the side of the hexagonal gold nanoplate particles greatly improved the localized surface plasmon resonance strength.
 
□ Picture Description
Asymmetric localized surface plasmon resonance (LSPR) intensity distribution of hexagonal gold nanoplate particles and improvement of surface plasmon strength according to tensile strain Single hexagonal gold nanoplate particles have four (α, β, γ, δ) local surface plasmon resonance modes, of which the lateral surface plasmon resonance (γ) intensity distribution is asymmetric because the tensile strain from one side greatly improves the lateral surface plasmon resonance strength.