journal article·2018-03-27

Rapid Identification of the Layer Number of Large-Area Graphene on Copper

Zhikai Qi, Xudong Zhu, Hongchang Jin, Tiezhu Zhang, Xianghua Kong, Rodney S. Ruoff, Zhenhua Qiao, Hengxing Ji

Chemistry of Materials· Volume 30· Issue 6
Publisher page

Abstract

Chemical vapor deposition (CVD) on Cu foils emerged as an important method for preparing high-quality and large-area graphene films for practical applications. However, to date it remains challenging to rapidly identify the structural features, especially the layer numbers, of CVD-graphene directly on Cu substrate. Herein, we report an O2-plasma-assisted approach for identifying the coverage, wrinkles, domain size, and layer number of large-area graphene films on Cu foils by optical microscopy. The wrinkles and grain boundaries of five-layer graphene can be observed with a grayscale increment of ∼23.4% per one graphene layer after O2-plasma treatment for only 15 s, which allows for checking graphene on Cu foils with a sample size of 17 cm × 20 cm in a few minutes. The Raman spectroscopy and X-ray photoelectron spectroscopy presents a strong layer number dependence of both the plasma induced graphene defects and Cu oxides, which, as indicated by molecular dynamic simulation, is responsible for the improved image contrast as a result of the interaction between O-ions and graphene with different layer numbers. We expect that this O2-plasma-assisted method would be applied to meter-scale samples if atmospheric-pressure plasma is used and therefore will be beneficial for the fast evaluation of CVD-graphene in both laboratory and industry.
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Research context

OpenAlex topics: Graphene research and applications · Diamond and Carbon-based Materials Research · ZnO doping and properties

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Technology of China, Hefei, Anhui 230026, China

ICQD, Hefei National Laboratory for Physical Sciences at Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China

School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, China

Center for Multidimensional Carbon Materials, Institute for Basic Science Center at UNIST Campus, Ulsan 44919, Republic of Korea

Funding

Ministry of Education of the People's Republic of China · National Natural Science Foundation of China · Natural Science Foundation of Anhui Province · Chinese Academy of Sciences · Collaborative Innovation Center of Chemistry for Energy Materials, University of Science and Technology of China

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