Affiliation:
1. Department of Mechanical Engineering and Materials Science and Institute of Materials Science and Engineering Washington University in St. Louis St. Louis MO 63130 USA
2. Department of Energy Systems Research and Department of Materials Science and Engineering Ajou University Suwon 16499 South Korea
3. Department of Materials Science and Engineering Chonnam National University Gwangju 61186 South Korea
4. School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 16419 South Korea
Abstract
AbstractCrystallographic characteristics, including grain boundaries and crystallographic orientation of each grain, are crucial in defining the properties of two‐dimensional materials (2DMs). To date, local microstructure analysis of 2DMs, which requires destructive and complex processes, is primarily used to identify unknown 2DM specimens, hindering the subsequent use of characterized samples. Here, a nondestructive large‐area 2D crystallographic analytical method through sticky‐note‐like van der Waals (vdW) assembling–disassembling is presented. By the vdW assembling of veiled polycrystalline graphene (PCG) with a single‐atom‐thick single‐crystalline graphene filter (SCG‐filter), detailed crystallographic information of each grain in PCGs is visualized through a 2D Raman signal scan, which relies on the interlayer twist angle. The scanned PCGs are seamlessly separated from the SCG‐filter using vdW disassembling, preserving their original condition. The remaining SCG‐filter is then reused for additional crystallographic scans of other PCGs. It is believed that the methods can pave the way for advances in the crystallographic analysis of single‐atom‐thick materials, offering huge implications for the applications of 2DMs.
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