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Multifunctional Macroassembled Graphene Nanofilms with High Crystallinity

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Title
Multifunctional Macroassembled Graphene Nanofilms with High Crystallinity
Author(s)
Li Peng; Han, Ying; Meihui Wang; Cao, Xiaoxue; Gao, Junfeng; Liu, Yingjun; Xianjue Chen; Bin Wang; Bo Wang; Chongyang Zhu; Wang, Xiao; Cao, Ke; Ming Huang; Benjamin V. Cunning; Pang, Jintao; Xu, Wendao; Ying, Yibin; Xu, Zhen; Fang, Wenzhang; Lu, Yang; Rodney S. Ruoff; Gao, Chao
Publication Date
2021-12
Journal
Advanced Materials, v.33, no.49
Publisher
John Wiley and Sons Inc
Abstract
© 2021 Wiley-VCH GmbHA “cooling–contraction” method to separate large-area (up to 4.2 cm in lateral size) graphene oxide (GO)-assembled films (of nanoscale thickness) from substrates is reported. Heat treatment at 3000 °C of such free-standing macroscale films yields highly crystalline “macroassembled graphene nanofilms” (nMAGs) with 16–48 nm thickness. These nMAGs present tensile strength of 5.5–11.3 GPa (with ≈3 µm gauge length), electrical conductivity of 1.8–2.1 MS m−1, thermal conductivity of 2027–2820 W m−1 K−1, and carrier relaxation time up to ≈23 ps. As a demonstration application, an nMAG-based sound-generator shows a 30 µs response and sound pressure level of 89 dB at 1 W cm−2. A THz metasurface fabricated from nMAG has a light response of 8.2% for 0.159 W mm−2 and can detect down to 0.01 ppm of glucose. The approach provides a straightforward way to form highly crystallized graphene nanofilms from low-cost GO sheets.
URI
https://pr.ibs.re.kr/handle/8788114/10837
DOI
10.1002/adma.202104195
ISSN
0935-9648
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > 1. Journal Papers (저널논문)
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