石墨烯
材料科学
聚丙烯腈
光电子学
电子迁移率
纳米技术
异质结
电磁屏蔽
复合材料
聚合物
作者
Shiyu Luo,Peng Li,Yangsu Xie,Xiaoxue Cao,Xiao Wang,Xiaoting Liu,Tingting Chen,Zhanpo Han,Peidong Fan,Haiyan Sun,Ying Shen,Fangwei Guo,Yuxing Xia,Kaiwen Li,Xin Ming,Chao Gao
标识
DOI:10.1007/s40820-023-01032-6
摘要
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 cm 2 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 × 10 5 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.
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