Second Timescale Synthesis of High-Quality Graphite Films by Quenching for Effective Electromagnetic Interference Shielding.
Second Timescale Synthesis of High-Quality Graphite Films by Quenching for Effective Electromagnetic Interference Shielding.
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DOI：
10.1021/acsnano.9b08169
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发表时间：
2020-02
期刊：
影响因子：
17.1
通讯作者：
Tianya Zhou;Chuan Xu;Haopeng Liu;Qinwei Wei;Han Wang;Jiangang Zhang;T. Zhao;Zhibo Liu;
中科院分区：
文献类型：
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作者：
Tianya Zhou;Chuan Xu;Haopeng Liu;Qinwei Wei;Han Wang;Jiangang Zhang;T. Zhao;Zhibo Liu;
石墨薄膜具有许多优异的性能，在储能、电磁屏蔽、热管理、紫外光刻等领域有着广泛的应用。然而，现有的合成方法需要约3000 ℃的极高加工温度和/或通常数小时的长加工时间。在这里，我们报告的超快合成几十纳米厚的高品质石墨薄膜在几秒钟内淬火热镍箔在乙醇中。垂直生长速率可达64 nm s-1以上，比现有方法提高两个数量级以上。此外，该薄膜显示出优异的电导率（~2.6 × 105 S/m）和机械强度（~110 MPa），与化学气相沉积合成的那些相当或甚至更好。作为一个例子，我们证明了这些石墨薄膜有效的EMI屏蔽的潜力，显示出创纪录的绝对屏蔽效率为481，000 dB cm 2 g-1，优于所有报道的合成材料。
Graphite film has many remarkable properties and intriguing applications from energy storage, electromagnetic interference (EMI) shielding, thermal management to ultraviolet lithography. However, the existing synthesis methods require extremely high processing temperature of ~3000 ºC and/or long processing time of typically hours. Here, we report ultrafast synthesis of tens-nanometer-thick high-quality graphite films within a few seconds by quenching a hot Ni foil in ethanol. The vertical growth rate can reach over 64 nm s-1, which is more than two orders of magnitude higher than those of the existing methods. Moreover, the films show excellent electrical conductivity (~2.6 105 S/m) and mechanical strength (~110 MPa) comparable to or even better than those synthesized by chemical vapor deposition. As an example, we demonstrate the potential of these graphite films for effective EMI shielding, which show a record absolute shielding effectiveness of 481,000 dB cm2 g-1, outperforming all the reported synthetic materials.