期刊
ACS NANO
卷 5, 期 9, 页码 6843-6854出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn200565y
关键词
Cu diffusion; nanomaterials; unconventional galvanic replacement reaction; surface-limited Cu nanocrystals; diffusion coefficient
类别
资金
- National Research Council (NRC, NIH(NIBIB)/NIST)
- NSF
Metal diffusion in nanoscale materials is of great Interest, yet the detailed kinetic behavior of such diffusion remains elusive. We observe direction-controlled Cu diffusion during unconventional galvanic replacement reactions between surface-limited Cu nanocrystals (NCs) and HAuCl4. Using presynthesized Cu-Cu1.81S hetero-oligomer and Cu-Cu2S heterodimer NCs as templates and reactants, the controlled addition of HAuCl4 leads to the preferential outward diffusion of Cu, visualized by the formation of single-crystalline and straight, or polycrystalline and kinked, CuAu nanowires, respectively. The time dependent growth of these nanowires enables determination of nanoscale diffusion coefficients of Cu during these processes, for the first time.
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