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Vol. 15 (2023)

Flexible Large-Area Graphene Films of 50–600 nm Thickness with High Carrier Mobility

https://doi.org/10.1007/s40820-023-01032-6
Shiyu Luo
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Li Peng
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Yangsu Xie
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, Guangdong, People’s Republic of China
Xiaoxue Cao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Xiao Wang
Shenzhen Key Laboratory of Nanobiomechanics, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, People’s Republic of China
Xiaoting Liu
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Tingting Chen
College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518055, Guangdong, People’s Republic of China
Zhanpo Han
School of Micro‑Nanoelectronics, Zhejiang University, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou 311200, People’s Republic of China
Peidong Fan
Hangzhou Gaoxi Technol Co Ltd, Hangzhou 311113, People’s Republic of China
Haiyan Sun
Hangzhou Gaoxi Technol Co Ltd, Hangzhou 311113, People’s Republic of China
Ying Shen
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Fan Guo
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Yuxing Xia
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Kaiwen Li
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Xin Ming
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
Chao Gao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China

Corresponding Author: Chao Gao

chaogao@zju.edu.cn

Nano-Micro Letters, Vol. 15 (2023), Article Number: 61

Abstract

Bulk graphene nanofilms feature fast electronic and phonon transport in combination with strong light–matter interaction and thus have great potential for versatile applications, spanning from photonic, electronic, and optoelectronic devices to charge-stripping and electromagnetic shielding, etc. However, large-area flexible close-stacked graphene nanofilms with a wide thickness range have yet to be reported. Here, we report a polyacrylonitrile-assisted ‘substrate replacement’ strategy to fabricate large-area free-standing graphene oxide/polyacrylonitrile nanofilms (lateral size ~ 20 cm). Linear polyacrylonitrile chains-derived nanochannels promote the escape of gases and enable macro-assembled graphene nanofilms (nMAGs) of 50–600 nm thickness following heat treatment at 3,000 °C. The uniform nMAGs exhibit 802–1,540 cm2 V−1 s−1 carrier mobility, 4.3–4.7 ps carrier lifetime, and > 1,581 W m−1 K−1 thermal conductivity (nMAG-assembled 10 µm-thick films, mMAGs). nMAGs are highly flexible and show no structure damage even after 1.0 × 105 cycles of folding–unfolding. Furthermore, nMAGs broaden the detection region of graphene/silicon heterojunction from near-infrared to mid-infrared and demonstrate higher absolute electromagnetic interference (EMI) shielding effectiveness than state-of-the-art EMI materials of the same thickness. These results are expected to lead to the broad applications of such bulk nanofilms, especially as micro/nanoelectronic and optoelectronic platforms.


Highlights:


1 Large-area production of self-standing graphene nanofilm (~ 20 cm) through a clean ‘substrate replacement’ strategy.
2 Realizing highly crystalline graphene nanofilms without micro-gasbags by introducing polymers.
3 The graphene nanofilms demonstrate a solid light–matter interaction (photoelectric conversion in the mid-infrared and electromagnetic interference (EMI) shielding in X-band) with performance beyond state-of-the-art graphene/silicon diodes and EMI materials.

Keywords

Flexible large-area graphene nanofilm High carrier mobility Mid-infrared detection Electromagnetic interference shielding Heat transfer
Luo, Shiyu, Li Peng, Yangsu Xie, Xiaoxue Cao, Xiao Wang, Xiaoting Liu, Tingting Chen, Zhanpo Han, Peidong Fan, Haiyan Sun, Ying Shen, Fan Guo, Yuxing Xia, Kaiwen Li, Xin Ming, and Chao Gao. 2023. “Flexible Large-Area Graphene Films of 50–600 Nm Thickness With High Carrier Mobility”. Nano-Micro Letters 15 (March):61. https://doi.org/10.1007/s40820-023-01032-6.
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