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Chen W, Wu T, Wang Y, Wang Y, Ma M, Zheng Q, Wu Z. Filtering Robust Graphite without Incommensurate Interfaces by Electrical Technique. ACS APPLIED MATERIALS & INTERFACES 2023; 15. [PMID: 38047454 PMCID: PMC10726965 DOI: 10.1021/acsami.3c12234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Revised: 11/13/2023] [Accepted: 11/13/2023] [Indexed: 12/05/2023]
Abstract
Two-dimensional (2D) van der Waals (vdW) layered materials have attracted considerable attention due to their potential applications in various fields. Among these materials, graphite is widely employed to achieve structural superlubricity (SSL), where the interfacial friction between two solids is almost negligible and the wear is zero. However, the development of integrated SSL systems using graphite flakes still faces a major obstacle stemming from the inherent delamination-induced instability in vdW layered materials. To address this issue, we propose a nondestructive filtering technique that utilizes electrical measurement to identify robust graphite flakes without delamination. Our experimental results confirm that all the filtered graphite flakes exhibit delamination-free behavior after more than 7000 cycles of sliding on a series of 2D and 3D substrates. Besides, we employ three types of characterizing methods to confirm that the filtering process does not impair the graphite flakes. Moreover, with focused ion beam (FIB) assisted slicing characterization and statistical analysis, we have discovered that all of the filtered flakes possess a graphite layer thickness below 100 nm. This is consistent with the thickness of the single crystalline graphite layer of our samples reported in the literature, suggesting the absence of incommensurate interfaces in the filtered graphite flakes. Our work contributes to a deeper understanding of the relationship between graphite conductance and incommensurate interfaces. In addition, we present a possible solution to address the delamination problem in layered materials, and this technique shows the potential to characterize the internal microstructure of grains and the distribution of grain boundaries in vdW materials on a large scale.
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Affiliation(s)
- Weipeng Chen
- Center
for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department
of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
| | - Tielin Wu
- Center
for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department
of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
| | - Yelingyi Wang
- Center
for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department
of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
| | - Yiran Wang
- Center
for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department
of Mechanical Engineering, Tsinghua University, Beijing 100084, China
| | - Ming Ma
- Center
for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department
of Mechanical Engineering, Tsinghua University, Beijing 100084, China
- State
Key Lab of Tribology in Advanced Equipment (SKLT), Tsinghua University, Beijing 10084, China
- Institute
of Superlubricity Technology, Research Institute
of Tsinghua University in Shenzhen, Shenzhen 518057, China
| | - Quanshui Zheng
- Center
for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department
of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
- State
Key Lab of Tribology in Advanced Equipment (SKLT), Tsinghua University, Beijing 10084, China
- Institute
of Superlubricity Technology, Research Institute
of Tsinghua University in Shenzhen, Shenzhen 518057, China
- Tsinghua
Shenzhen International Graduate School, Shenzhen 518057, China
| | - Zhanghui Wu
- Center
for Nano and Micro Mechanics, Tsinghua University, Beijing 100084, China
- Department
of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing 100084, China
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