Laser-induced shape transformation and electrophoretic analysis of triangular silver nanoplates

Area of Science:

• Nanotechnology
• Materials Science
• Physical Chemistry

Background:

• Silver nanoplates are crucial in plasmonics and sensing.
• Understanding laser-induced nanomaterial transformations is vital for controlling their properties.
• Nanoplate shape influences optical and surface characteristics.

Purpose of the Study:

• To investigate the shape transformation of silver triangular nanoplates under nanosecond laser irradiation.
• To correlate shape changes with alterations in optical properties and surface charge.
• To explore the impact on surface-enhanced Raman scattering (SERS).

Main Methods:

• Monitoring shape evolution using agarose gel electrophoresis, optical spectroscopy, and electron microscopy.
• Irradiating silver nanoplates (110 nm edge, 14 nm thickness) with nanosecond laser pulses.
• Measuring surface-enhanced Raman scattering of 4-nitrobenzenethiol and electrophoretic mobility.

Main Results:

• Laser irradiation gradually truncated nanoplates into hexagonal and spherical shapes.
• Surface-enhanced Raman scattering decreased significantly with laser exposure.
• Electrophoretic mobility decreased with irradiation time, indicating modified surface charge density.

Conclusions:

• Nanosecond laser pulses induce significant shape transformations in silver nanoplates.
• Shape evolution directly impacts the SERS activity and surface charge of silver nanostructures.
• This study provides insights into laser-based control of nanoparticle morphology and functionality.