2018•Modern Physics Letters BRequires access

Probing plasmon resonances of individual aluminum nanoparticles

Zhongxia Wei, Peng Mao, Lu Cao, Fengqi Song

Abstract

The plasmon resonances of individual aluminum nanoparticles are investigated by electron energy-loss spectroscopy (EELS) in scanning transmission electron microscope (STEM). Surface plasmon mode and bulk plasmon mode of Al nanoparticles are clearly characterized in the EEL spectra. Discrete dipole approximation (DDA) calculations show that as the particle diameter increases from 20 nm to 100 nm, the plasmon resonance shifts to lower energy and higher mode of surface plasmon arises when the diameter reaches 60 nm and larger.

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Key concepts: Plasmon, Surface plasmon resonance, Localized surface plasmon, Surface plasmon, Materials science, Nanoparticle, Electron energy loss spectroscopy, Discrete dipole approximation