4 years ago

Low-energy transmission electron diffraction and imaging of large-area graphene

Xiaoyang Xiao, Li Lin, Peng Liu, Kaili Jiang, Qunqing Li, Lina Zhang, Yong Xu, Xiaoyang Lin, Lianmao Peng, Mingwen Zhao, Zhongfan Liu, Wenhui Duan, Peng Lei, Hailin Peng, Wei Zhao, Rong Yu, Shoushan Fan, Yuanmin Zhu, Jiangtao Wang, Bingyu Xia

Two-dimensional (2D) materials have attracted interest because of their excellent properties and potential applications. A key step in realizing industrial applications is to synthesize wafer-scale single-crystal samples. Until now, single-crystal samples, such as graphene domains up to the centimeter scale, have been synthesized. However, a new challenge is to efficiently characterize large-area samples. Currently, the crystalline characterization of these samples still relies on selected-area electron diffraction (SAED) or low-energy electron diffraction (LEED), which is more suitable for characterizing very small local regions. This paper presents a highly efficient characterization technique that adopts a low-energy electrostatically focused electron gun and a super-aligned carbon nanotube (SACNT) film sample support. It allows rapid crystalline characterization of large-area graphene through a single photograph of a transmission-diffracted image at a large beam size. Additionally, the low-energy electron beam enables the observation of a unique diffraction pattern of adsorbates on the suspended graphene at room temperature. This work presents a simple and convenient method for characterizing the macroscopic structures of 2D materials, and the instrument we constructed allows the study of the weak interaction with 2D materials.

Publisher URL: http://advances.sciencemag.org/cgi/content/short/3/9/e1603231

DOI: 10.1126/sciadv.1603231

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