Surface Segregated AgAu Tadpole‐Shaped Nanoparticles Synthesized Via a Single Step Combined Galvanic and Citrate Reduction Reaction
Abstract
New AgAu tadpole nanocrystals were synthesized in a one‐step reaction involving simultaneous galvanic replacement between Ag nanospheres and AuCl4−(aq.) and AuCl4−(aq.) reduction to Au in the presence of citrate. The AgAu tadpoles display nodular polycrystalline hollow heads, while their undulating tails are single crystals. The unusual morphology suggests an oriented attachment growth mechanism. Remarkably, a 1 nm thick Ag layer was found to segregate so as to cover the entire surface of the tadpoles. By varying the nature of the seeds (Au NPs), double‐headed Au tadpoles could also be obtained. The effect of a number of reaction parameters on product morphology were explored, leading to new insights into the growth mechanisms and surface segregation behavior involved in the synthesis of bimetallic and anisotropic nanomaterials.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 29, 2015
- Source ID
- 10.1002/chem.201501704
Entities
People
- Anderson G. M. Da Silva
- Edward A. Lewis
- Pedro H. C. Camargo
- Rafael S. Alves
- Sarah Jane Haigh
- Thenner S. Rodrigues
- Thomas J. A. Slater
Organizations
- Coordenação de Aperfeicoamento de Pessoal de Nível Superior
- Defense Threat Reduction Agency
- Engineering and Physical Sciences Research Council
- National Council for Scientific and Technological Development
- São Paulo Research Foundation