MoS2 Liquid Cell Electron Microscopy Through Clean and Fast Polymer-Free MoS2 Transfer,Nano Letters

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MoS2 Liquid Cell Electron Microscopy Through Clean and Fast Polymer-Free MoS2 Transfer
Nano Letters ( IF 9.6 ) Pub Date : 2019-02-11 00:00:00 , DOI: 10.1021/acs.nanolett.8b04821
Jiwoong Yang ₁ , Moon Kee Choi _{2,

3} , Yuewen Sheng ₄ , Jaebong Jung ₅ , Karen Bustillo ₆ , Tongxin Chen ₄ , Seung-Wuk Lee _{2,

3} , Peter Ercius ₆ , Ji Hoon Kim ₅ , Jamie H. Warner ₄ , Emory M. Chan ₆ , Haimei Zheng _{1,

7}

Affiliation

Two dimensional (2D) materials have found various applications because of their unique physical properties. For example, graphene has been used as the electron transparent membrane for liquid cell transmission electron microscopy (TEM) due to its high mechanical strength and flexibility, single-atom thickness, chemical inertness, etc. Here, we report using 2D MoS₂ as a functional substrate as well as the membrane window for liquid cell TEM, which is enabled by our facile and polymer-free MoS₂ transfer process. This provides the opportunity to investigate the growth of Pt nanocrystals on MoS₂ substrates, which elucidates the formation mechanisms of such heterostructured 2D materials. We find that Pt nanocrystals formed in MoS₂ liquid cells have a strong tendency to align their crystal lattice with that of MoS₂, suggesting a van der Waals epitaxial relationship. Importantly, we can study its impact on the kinetics of the nanocrystal formation. The development of MoS₂ liquid cells will allow further study of various liquid phenomena on MoS₂, and the polymer-free MoS₂ transfer process will be implemented in a wide range of applications.

中文翻译：

通过干净且快速的无聚合物MoS ₂转移获得MoS ₂液池电子显微镜

二维（2D）材料因其独特的物理特性而得到了广泛的应用。例如，石墨烯由于其高的机械强度和柔韧性，单原子厚度，化学惰性等原因而被用作液体细胞透射电子显微镜（TEM）的电子透明膜。在此，我们报道使用2D MoS ₂作为材料。功能性基材以及用于液体电池TEM的膜窗，这是通过我们便捷且无聚合物的MoS ₂转移工艺实现的。这为研究Pt纳米晶体在MoS ₂衬底上的生长提供了机会，从而阐明了这种异质结构2D材料的形成机理。我们发现在MoS _2中形成的Pt纳米晶体液态电池具有使其晶格与MoS _2的晶格对齐的强烈趋势，表明范德华斯外延关系。重要的是，我们可以研究其对纳米晶体形成动力学的影响。MoS ₂液体电池的发展将允许进一步研究MoS ₂上的各种液体现象，并且无聚合物的MoS ₂转移过程将在广泛的应用中实现。

更新日期：2019-02-11

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