通过二维过渡金属碳化物Ti3CNT (MXene) 的异常吸收电磁波
Aamir Iqbal1,2,3, Faisal Shahzad1, Kanit Hantanasirisakul3
1Materials Architecturing Research Centre, Korea Institute of Science and Technology (KIST), Seoul 02792, Korea.
Science (New York, N.Y.)
|July 25, 2020
概括
一种新的二维 (2D) 过渡金属碳化物Ti3CNT MXene显示出优异的电磁干扰 (EMI) 屏蔽. 通过利用高电磁波吸收的独特层次结构来提高其性能.
科学领域:
- 材料科学
- 凝聚物质物理学
- 纳米技术
背景情况:
- 轻质,超薄,灵活的电磁干扰 (EMI) 屏蔽材料对于保护电子电路和便携式电信设备至关重要.
- 现有材料通常面临导电性,厚度和屏蔽效率之间的权衡.
- 减少电子元件之间的交叉交谈需要先进的屏蔽解决方案.
研究的目的:
- 调查二维 (2D) 过渡金属碳化物,Ti3CNT MXene的EMI屏蔽能力.
- 将Ti3CNT MXene与其他导电材料 (如Ti3C2T MXene和金属) 的屏蔽效果进行比较.
- 了解对观察到的屏蔽性能负责的基本机制.
主要方法:
- Ti3CNT MXene的合成和表征
- 用Ti3CNT MXene进行热,以增强其性能.
- 测量Ti3CNT MXene的电磁干扰屏蔽效率 (SE).
- 与Ti3C2T MXene和类似厚度的金属进行比较.
主要成果:
- Ti3CNT MXene的屏蔽效率高于具有更高导电性的Ti3C2T MXene和相同厚度的金属.
- 热显著提高了Ti3CNT MXene的屏蔽性能.
- 这种增强的屏蔽是由于其多层的超材料结构导致电磁波的异常高吸收.
结论:
- Ti3CNT MXene是先进的电磁干扰屏蔽应用的一个有前途的材料.
- 独特的分层结构和热回火有助于特殊的屏蔽性能.
- 需要进一步研究电磁波与二维材料之间的基本相互作用机制.
相关概念视频
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...