Laser stripping of Ag shell from Au@Ag nanoparticles

摘要

Metallic nanoparticles(NPs)are a class of important materials with widespread applications due to their chemical stability and high photothermal conversion efficiency.It is essential to post-control the morphology and structure of metallic NPs for practical applications.Laser processing of metallic NPs has been widely investigated.Most of previous studies on the reshaping process have been related to the single metallic NPs,and no attempt has been made to separate the components in bimetallic NPs.Here,the stripping of Ag shell from Au@Ag NPs based on ultrafast laser excitation was investigated.The experimental work combined spectrum and microscopy analysis showed the structure transformation of Au@Ag NPs.Through the electric field simulation,the stripping of the Ag shell may arise from the electric field effect.