Electromagnetic Interference Shielding of Graphene Aerogel with Layered Microstructure Fabricated via Mechanical Compression
| Autor: | Chuan-Bing Li, Hu Yi, Zhao Qi, Yujun Li, Yue Luo, Guo-Yu Yang, Jian-Jun Jiang |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Graphene Aerogel 02 engineering and technology Dissipation 010402 general chemistry 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Electromagnetic interference 0104 chemical sciences law.invention law Self-healing hydrogels Electromagnetic shielding Formability General Materials Science Composite material 0210 nano-technology |
| Zdroj: | ACS Applied Materials & Interfaces. 12:30686-30694 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.0c05688 |
| Popis: | Graphene aerogel is a promising electromagnetic interference (EMI) shielding material because of its light weight, excellent electrical conductivity, uniform three-dimensional (3D) microporous structure, and good mechanical strength. The graphene aerogel with high EMI shielding performance is attracting considerable critical attention. In this study, a novel procedure to fabricate high EMI shielding graphene aerogel was presented, inspired by the irreversible deformation of hydrogels under mechanical pressure. The procedure involved a mechanical compression step on graphene hydrogels for the purpose of altering microstructures followed by freeze-drying and thermal annealing at 900 °C to generate the final products. Because of the flow of internal liquid caused by mechanical compression, the microstructures of hydrogels changed from a cellular configuration to a layered configuration. After a high degree of compression, GAs can be endowed with homogeneous layered structure and high density, which plays a leading role in electromagnetic wave dissipation. Consequently, the aerogels with excellent electrical conductivity (181.8 S/m) and EMI shielding properties (43.29 dB) could be obtained. Besides, the compression process enabled us to form complex hydrogel shapes via different molds. This method enhances the formability of graphene aerogels and provides a robust way to control the microstructure. |
| Databáze: | OpenAIRE |
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