Strain Anisotropy Driven Spontaneous Formation of Nanoscrolls from 2D Janus Layers
Strain Anisotropy Driven Spontaneous Formation of Nanoscrolls from 2D Janus Layers
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DOI：
10.1002/adfm.202303526
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发表时间：
2023-05
影响因子：
19
通讯作者：
M. Sayyad;Ying Qin;J. Kopaczek;Adway Gupta;N. Patoary;S. Sinha;Emmie Benard;A. Davis;K. Y
中科院分区：
文献类型：
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作者：
M. Sayyad;Ying Qin;J. Kopaczek;Adway Gupta;N. Patoary;S. Sinha;Emmie Benard;A. Davis;K. Y
二维Janus过渡金属二硫族化合物（TMDs）由于其在破镜对称和自驱动极化场中产生的涌现特性而受到人们的关注。虽然有人提出他们的vdW超晶格是实现压电和光伏优异性能的关键，但现有的合成最终限制了它们的实现。本文报道了通过简单的单滴溶液技术，由Janus tdmds制成的第一个封装的vdW纳米卷。计算结果表明，Janus MSeS${\rm{M}}_{\rm{Se}}}^{\rm{S}}$ （M = Mo， W）中顶部硫原子和底部硒原子之间的玻尔半径差导致了一个永久的压缩表面应变，该表面应变在小的液体相互作用后成为纳米卷形成的催化剂。与经典2D层不同，Janus tmd的表面应变可以通过在顶部放置更大的玻尔半径原子（MSSe）${\rm{M}}_{\rm{S}}^{{\rm{Se}}}) $ $来实现从压缩到拉伸的转变，从而产生倒C形卷轴。详细的显微镜研究提供了对它们的形态和容易形成的摩尔格的第一个见解。相比之下，光谱学和fet研究建立了它们的激子和器件特性，并突出了与2D平面Janus tmd相比的显着差异。这些结果引入了第一个极性Janus TMD纳米涡旋，并引入了固有的应变驱动的涡旋动力学作为产生超晶格的催化剂。
2D Janus transition metal dichalcogenides (TMDs) have attracted attention due to their emergent properties arising from broken mirror symmetry and self‐driven polarization fields. While it has been proposed that their vdW superlattices hold the key to achieving superior properties in piezoelectricity and photovoltaic, available synthesis has ultimately limited their realization. Here, the first packed vdW nanoscrolls made from Janus TMDs through a simple one‐drop solution technique are reported. The results, including ab initio simulations, show that the Bohr radius difference between the top sulfur and the bottom selenium atoms within Janus MSeS${\rm{M}}_{{\rm{Se}}}^{\rm{S}}$ (M = Mo, W) results in a permanent compressive surface strain that acts as a nanoscroll formation catalyst after small liquid interaction. Unlike classical 2D layers, the surface strain in Janus TMDs can be engineered from compressive to tensile by placing larger Bohr radius atoms on top ( MSSe)${\rm{M}}_{\rm{S}}^{{\rm{Se}}})\ $ to yield inverted C scrolls. Detailed microscopy studies offer the first insights into their morphology and readily formed Moiré lattices. In contrast, spectroscopy and FETs studies establish their excitonic and device properties and highlight significant differences compared to 2D flat Janus TMDs. These results introduce the first polar Janus TMD nanoscrolls and introduce inherent strain‐driven scrolling dynamics as a catalyst to create superlattices.