Tug-of-war in nanoparticles: competitive growth of Au on Au-Fe3O4 nanoparticles.
Mechanical property of dumbbell-like Au-Fe(3)O(4) nanoparticles (NPs) is investigated from a synthetic point of view by overgrowing Au(2) on the Au(1)-Fe(3)O(4) NPs. The competitive growth of Au(2) on the preformed Au(1)-Fe(3)O(4) NPs induced an interesting "tug-of-war" between Au(2) and Fe(3)O(4) in the formed Au(2)-Au(1)-Fe(3)O(4) ternary nanostructure. An interpretation of the observed phenomena is proposed based on a mechanical analysis of the stress and strain distribution across the nanoparticle, which is further verified by control experiments with particle size tuned.
Wang
Chao
C
Department of Chemistry, Division of Engineering, Brown University, Providence, Rhode Island 02912, USA.
Wei
Yujie
Y
Jiang
Hongyuan
H
Sun
Shouheng
S
D003460:Crystallization / Q000379:methods*; D055119:Elastic Modulus; D005290:Ferric Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008956:Models, Chemical; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D013314:Stress, Mechanical; D013499:Surface Properties
D005290:Ferric Compounds; D046911:Macromolecular Substances; C000499:ferric oxide; D006046:Gold