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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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Multifunctional Macroassembled Graphene Nanofilms with High Crystallinity

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Title
Multifunctional Macroassembled Graphene Nanofilms with High Crystallinity
Author
Li PengHan, YingWang, MeihuiCao, XiaoxueGao, JunfengLiu, YingjunChen, XianjueWang, BinWang, BoZhu, ChongyangWang, XiaoCao, KeHuang, MingCunning, Benjamin, VPang, JintaoXu, WendaoYing, YibinXu, ZhenFang, WenzhangLu, YangRuoff, Rodney S.Gao, Chao
Issue Date
2021-12
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED MATERIALS, v.33, no.49, pp.2104195
Abstract
A "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 degrees 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 approximate to 3 mu m 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 approximate to 23 ps. As a demonstration application, an nMAG-based sound-generator shows a 30 mu s 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://scholarworks.unist.ac.kr/handle/201301/55356
URL
https://onlinelibrary.wiley.com/doi/10.1002/adma.202104195
DOI
10.1002/adma.202104195
ISSN
0935-9648
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CHM_Journal Papers
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