One-step method for the fabrication of pure and metal-decorated densified CNT films for effective electromagnetic interference shielding
One-step method for the fabrication of pure and metal-decorated densified CNT films for effective electromagnetic interference shielding
复制标题
DOI：
10.1016/j.carbon.2023.118370
复制
发表时间：
2023-08
期刊：
影响因子：
10.9
通讯作者：
Fan Yang;Shengcun Ma;Chia Miang Khor;Yiming Su;Zahra Barani;Zhenpeng Xu;Arthur Boyko;Arpita Iddya-Arpita
中科院分区：
文献类型：
--
作者：
Fan Yang;Shengcun Ma;Chia Miang Khor;Yiming Su;Zahra Barani;Zhenpeng Xu;Arthur Boyko;Arpita Iddya-Arpita
现代先进的电子和电信技术需要轻、薄、坚固的高导电性电磁屏蔽材料来保护电路免受电磁干扰。碳纳米管（CNT）因其优异的机械强度、高导电性和重量轻而成为电磁屏蔽材料的理想候选者。然而，由于邻近碳纳米管之间存在许多接触电阻点，碳纳米管薄膜的导电性相对较差，这阻碍了它们作为屏蔽材料的使用。在这里，我们提出了一种简单的碳纳米管薄膜制造方法，通过破坏碳纳米管网络中相邻碳纳米管之间的分离（即致密化材料）来增强碳纳米管薄膜的导电性。通过这种简单的方法得到的致密碳纳米管薄膜具有高导电性（~ 106S m-1），并且在8.2 GHz和12.4 GHz之间的频率范围内具有99.999992% （71 dB）的优异屏蔽效果，厚度为14.3 μm。卓越的绝对屏蔽效能（3.50 × 105dB cm-2g-1）是由于材料的低密度（即~ 1.0 g/cm3）、薄度（即1.3-14.3 μm）和类似金属的导电性。此外，所制备的碳纳米管片是一种理想的金装饰衬底，可以进一步显著提高EMI屏蔽性能（EMI SE从松散膜中的43.90 dB增加到致密膜中的56.67 dB，当致密碳纳米管膜上涂有薄金层时进一步增加到66.12 dB）。金装饰致密碳纳米管薄膜的卓越性能使其成为满足现代尖端、轻量化和紧凑型电子设备电磁屏蔽需求的强有力的候选者。
Light-weight, thin, and robust electromagnetic shielding materials with high electrical conductivity are needed for advanced modern electronics and telecommunication technologies to protect circuits from electromagnetic interference. Carbon nanotubes (CNT) are ideal candidates for electromagnetic shielding materials due to their excellent mechanical strength, high electrical conductivity, and light weight. However, the relatively poor electrical conductivity of CNT films, a result of the many points of contact resistance between neighboring CNTs, is an obstacle towards their utilization as a shielding material. Here, we propose a facile CNT film fabrication method that enhances the conductivity of CNT films by collapsing the separation between neighboring CNTs (i.e., densifying the material) in the CNT network. The dense CNT films resulting from this facile method exhibit high electrical conductivity (∼106S m-1), and achieve excellent shielding of 99.999992% (71 dB) at frequencies between 8.2 GHz and 12.4 GHz with a thickness of 14.3 μm. The remarkable absolute shielding effectiveness (3.50 × 105dB cm-2g-1) is due to the material's low density (i.e., ∼1.0 g/cm3), thinness (i.e., 1.3–14.3 μm), and metal-like conductivity. Also, the produced CNT sheet is an ideal substrate for gold decoration that can dramatically enhance the EMI shielding performance further (EMI SE increased from 43.90 dB in the loose film to 56.67 dB in the dense film, which further increased to 66.12 dB when the dense CNT film was coated with a thin gold layer). The outstanding properties of gold-decorated dense CNT films make them strong candidates to meet the electromagnetic shielding needs of modern cutting-edge, lightweight, and compact electronic devices.