1D material systems such as Ag–Ni, Ag–Co, Ag–Fe nanowires or nanotubes have tremendous potential for making devices that require the coexistence of electrically conducting and magnetic phases and interfaces. The realization of such microstructures is very challenging essentially due to their high positive mixing enthalpies which makes it difficult to achieve unique non-equilibrium microstructures. In the present exploration, silver–nickel nanotubes were synthesized by adopting the electrodeposition technique. Detailed microstructural characterization of the nanotubes was carried out by using electron microscopy technique. The transmission electron microscopic examinations revealed that the microstructure of the nanotube consisted of nearly spherical, Ag–Ni nanoparticles encapsulated in a Ni-rich amorphous matrix. Ag–Ni nanoparticles exhibited two types of structures. The small-sized particles had single-phase crystal structure, whereas large-sized particles exhibited multiple twinned structure. Mechanism of formation of the nanotube involved the nucleation and subsequent growth of Ag–Ni nanoparticles inside the alumina template. Owing to the twinned structure, few nanoparticles grow larger and decomposed into Ag-rich and Ni-rich clusters that eventually matured to the nanotube.
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Rai, R.K., Srivastava, C. Synthesis and Mechanism of Formation of Non-equilibrium Ag–Ni Nanotubes. Metallogr. Microstruct. Anal. (2021). https://doi.org/10.1007/s13632-021-00713-1
- Electron microscopy