Growth dynamics and thermal stability of Ni nanocrystalline nanowires

The growth dynamics and the thermal stability of a Ni nanocrystalline nanowire (NNW) model system fabricated using electrochemical deposition has been investigated using X-ray diffraction, scanning and transition electron microcopy, and differential scanning calorimetry (DSC). It has been found that the thermal stability of the Ni-NNW is dominated by the microstructure movement and the grain boundary rotation mechanism at temperature ranging from 400 to 600 °C. The Ni-NNW experiences the Rayleigh instability at temperature approaching the melting point. The observed fragment separation in the Rayleigh phase-transition is much greater than that expected theoretically.

► The thermal instability of the Ni nanocrystalline nanowire (NNW) is dominated by the microstructure movement and the grain boundary rotation mechanism at temperature ranging from 400 to 600 °C. ► The Ni-NNW experiences the Rayleigh instability at temperature approaching the melting point. ► The observed fragment separation in the Rayleigh phase-transition is much greater than that expected theoretically.