滑动石墨烯桥梁液体金属层状异构结构纳米复合材料用于稳定的高性能电磁干扰屏蔽
1Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, Beijing Key Laboratory of Bio-Inspired Energy Materials and Devices, School of Chemistry, Beihang University, Beijing 100191, China.
ACS nano
|June 29, 2023
概括
研究人员开发了一种新型纳米复合材料,使用液态金属 (LM) 和减少的氧化石墨烯 (rGO) 来进行优质的电磁干扰 (EMI) 屏蔽. 这种材料为高级应用提供了卓越的稳定性和抗结冰能力.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 电磁学 电磁学 电磁学 电磁学
背景情况:
- 液体金属 (LM) 复合材料显示出由于高导电性和流动性而具有灵活的电磁干扰 (EMI) 屏蔽的前景.
- 现有的LM复合材料难以平衡高EMI屏蔽效率 (SE) 和低厚度.
- 环境稳定的EMI屏蔽材料对于苛刻的应用至关重要.
研究的目的:
- 开发一种高性能,稳定的EMI屏蔽材料,采用减少氧化石墨烯 (rGO) 桥接LM层异构结构.
- 克服现有的LM复合材料在SE和厚度方面的局限性.
- 为了创造一种具有增强耐用性和额外功能,如抗结冰的材料.
主要方法:
- 制备一个减少的石墨烯氧化物 (rGO) 桥梁液体金属 (LM) 层层的异构结构纳米复合材料.
- 加入液体注入的滑动表面 (S-rGO/LM) 增强稳定性.
- 关于EMI屏蔽性能,在恶劣条件下的稳定性和光热/朱尔加热性能的特征.
主要成果:
- 该S-rGO/LM纳米复合材料实现了超高X波段EMI SE的80dB在33μm和100dB在67μm内部厚度.
- 在暴露于强化学品,极端温度和机械磨损后,特殊的EMI屏蔽稳定性 (SE>70dB) 保持不变.
- 该材料表现出有效的光热行为和快速的朱尔加热 (179°C,<10秒),使其具有抗结冰/脱冰能力.
结论:
- 开发的S-rGO/LM纳米复合材料为高性能,稳定的EMI屏蔽提供了可行的解决方案.
- 该材料的独特特性使其适用于可穿戴设备,国防和航空航天领域的苛刻应用.
- 这项工作为设计具有多功能能力的基于LM的先进材料提供了一种新方法.
相关概念视频
01:24Metal-Semiconductor Junctions
395
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
395
01:27Biasing of Metal-Semiconductor Junctions
284
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
284