Strain-Induced Segregation in Bimetallic Multiply Twinned Particles.
We analyze the possibility of strain-induced segregation in bimetallic multiply twinned particles by an analytic first-order expansion within a continuum model. The results indicate that while the change in free energy may be small, there will be a noticeable segregation of larger atoms to the external surface and smaller ones to the core, which could have interesting effects when such nanoparticles are used as heterogeneous catalysts.
†Department of Materials Science and Engineering and ‡Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
Lingxuan
L
Peng
†Department of Materials Science and Engineering and ‡Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
Richard P
RP
Van Duyne
†Department of Materials Science and Engineering and ‡Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.
Laurence D
LD
Marks
alloy nanoparticles; multiply twinned particles; segregation; strain field; thermodynamic modeling