Zelenina Iryna, Veremchuk Igor, Grin Yuri, Simon Paul
Max-Planck-Institut für Chemische Physik Fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany.
Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstr. 400, 01314 Dresden, Germany.
Nanomaterials (Basel). 2021 Jan 10;11(1):163. doi: 10.3390/nano11010163.
Nano-scaled thermoelectric materials attract significant interest due to their improved physical properties as compared to bulk materials. Well-shaped nanoparticles such as nano-bars and nano-cubes were observed in the known thermoelectric material PbTe. Their extended two-dimensional nano-layer arrangements form directly in situ through electron-beam treatment in the transmission electron microscope. The experiments show the atomistic depletion mechanism of the initial crystal and the recrystallization of PbTe nanoparticles out of the microparticles due to the local atomic-scale transport via the gas phase beyond a threshold current density of the beam.
与块体材料相比，纳米级热电材料因其改善的物理性能而备受关注。在已知的热电材料碲化铅（PbTe）中观察到了形状良好的纳米颗粒，如纳米棒和纳米立方体。它们通过在透射电子显微镜中进行电子束处理直接原位形成扩展的二维纳米层排列。实验表明，由于电子束的阈值电流密度以上通过气相的局部原子尺度传输，初始晶体的原子耗尽机制以及碲化铅纳米颗粒从微粒中再结晶。
