Atomic imprinting in the absence of an intrinsic length scale
Atomic imprinting in the absence of an intrinsic length scale
复制标题
DOI：
10.1063/5.0027982
复制
发表时间：
2020-11
期刊：
影响因子：
6.1
通讯作者：
Chao Zhou;A. Datye;Zheng Chen;G. Simon;Xinzhe Wang;J. Schroers;U. Schwarz
中科院分区：
文献类型：
--
作者：
Chao Zhou;A. Datye;Zheng Chen;G. Simon;Xinzhe Wang;J. Schroers;U. Schwarz
块体金属玻璃（BMG）已成功地用于通过热塑性成形（TPF）复制在纳米甚至原子尺度上结构化的模具，这种能力被推测是植根于玻璃的无特征原子结构。然而，这些原子级精确压印的先前演示是在模具原子特征尺寸与BMG中成分的晶胞尺寸一致的条件下进行的。为了评估精确的原子级复制是否可能，即，独立于有利的组分尺寸/特征尺寸关系的偶然存在，我们已经使用Pt57.5Cu14.7Ni5.3P22.5来复制LaAlO 3单晶的三个不同的晶面，每个晶面暴露出不同的原子台阶高度。我们发现，在所有情况下，梯田表面终止可以复制显着的保真度，证实BMG热塑性塑料形成时，能够适应任何外部施加的限制与亚埃精度，而不受限制的因素有关的细节，其内部结构。这种前所未有的准无限复制保真度的能力揭示了BMG的过冷液态中的变形机制基本上是均匀的，并表明BMG的TPF是用于原子和精确纳米级压印的通用工具箱。
Bulk metallic glasses (BMGs) have successfully been used to replicate molds that are structured at the nano- and even atomic scale through thermoplastic forming (TPF), an ability that was speculated to be rooted in the glass’ featureless atomic structure. These previous demonstrations of atomically precise imprinting, however, were performed under conditions where mold atomic feature dimensions coincided with the unit cell size of constituents in the BMG. In order to evaluate if accurate atomic-scale replication is possible in general, i.e., independent of the accidental presence of favorable constituent size/feature size relationships, we have used Pt57.5Cu14.7Ni5.3P22.5 to replicate three different crystalline facets of LaAlO3 single crystals, each exposing distinct atomic step heights. We find that in all cases, the terraced surface termination can be copied with remarkable fidelity, corroborating that BMGs when thermoplastic formed are capable of adapting to any externally imposed confinement with sub-angstrom precision without being limited by factors related to the specifics of their internal structure. This unprecedented capability of quasi-limitless replication fidelity reveals that the deformation mechanism in the supercooled liquid state of BMGs is essentially homogeneous and suggests TPF of BMGs to be a versatile toolbox for atomic and precision nanoscale imprinting.