Strained Epitaxy of Monolayer Transition Metal Dichalcogenides for Wrinkle Arrays
Strained Epitaxy of Monolayer Transition Metal Dichalcogenides for Wrinkle Arrays
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用于皱纹阵列的单层过渡金属二硫属化物的应变外延
DOI：
10.1021/acsnano.0c09983
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发表时间：
2021
期刊：
影响因子：
17.1
通讯作者：
Cheng Chun
中科院分区：
文献类型：
--
作者：
Wang Jingwei;Han Mengjiao;Wang Qun;Ji Yaqiang;Zhang Xian;Shi Run;Wu Zefei;Zhang Liang;Amini Abbas;Guo Liang;Wang Ning;Lin Junhao;Cheng Chun
起皱的二维（2D）过渡金属二硫属化物（TMDC）提供了根据需要调节物理和化学性质的机制。传统上，通过将剥落的材料转移到预拉伸的聚合物上而实现的TMDC褶皱遭受差的控制和有限的样品面积，这显著阻碍了期望的应用。本文采用应变外延法在石英衬底上直接制作了大面积单层TMDCs褶皱阵列。衬底和TMDC材料之间的单轴热膨胀系数失配使得能够产生大的单轴热应变。通过在生长后对TMDC进行淬火，这种单轴热应变可以作为沿[0001]石英方向沿着的褶皱阵列的形式快速释放。以WS 2为模型体系，通过改变淬火温度，可以将生长皱纹的尺寸精细调节到100 nm以下。这些WS2褶皱可以在转移过程中局部折叠并形成具有奇数层数的各种多层结构。此外，WS2褶皱中的波纹结构引起了光学性质的显著变化，包括各向异性拉曼响应，增强的光致发光和二次谐波产生发射。此外，这些褶皱阵列表现出增强的化学反应性，其可以选择性地设计成具有改进的电催化性能的带阵列。应变外延的发展战略，在这里应该使更复杂的二维结构的设计的灵活性，提供了一个简单而有效的方式来调制性能与增强的性能。
Wrinkling two-dimensional (2D) transition metal dichalcogenides (TMDCs) provides a mechanism to adjust the physical and chemical properties as per need. Traditionally, TMDCs wrinkles achieved by transferring exfoliated materials on prestretched polymer suffer from poor control and limited sample area, which significantly hinders desirable applications. Herein, we fabricate large-area monolayer TMDCs wrinkle arrays directly on them-quartz substrate using strained epitaxy. The uniaxial thermal expansion coefficient mismatch between the substrate and TMDCs materials enables the generation of large uniaxial thermal strain. By quenching the TMDCs after growth, this uniaxial thermal strain can be quickly released as a form of wrinkle arrays along the [0001]quartzdirection. Using WS2as a model system, the size of as-grown wrinkles can be finely modulated within sub-100 nm by changing the quenching temperature. These WS2wrinkles can be locally folded and form various multilayer structures with odd layer numbers during the transfer process. Besides, the corrugated structures in WS2wrinkles induce significant changes to optical properties including anisotropic Raman response, enhanced photoluminescence, and second harmonic generation emissions. Furthermore, these wrinkle arrays exhibit enhanced chemical reactivity that can be selectively engineered to ribbon arrays with improved electrocatalytic performance. The developed strategy of strained epitaxy here should enable flexibility in the design of more sophisticated 2D-based structures, offering a simple but effective way toward the modulation of properties with enhanced performances.