Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, International Innovation Center for Forest Chemicals and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing 210037, China.
Key Laboratory of Green Chemical Technology of Fujian Province University, College of Ecological and Resources Engineering, Wuyi University, Wuyishan 354300, China.
Molecules. 2023 Mar 8;28(6):2482. doi: 10.3390/molecules28062482.
With the increasing pollution of electromagnetic (EM) radiation, it is necessary to develop low-cost, renewable electromagnetic interference (EMI) shielding materials. Herein, wood-derived carbon (WC) materials for EMI shielding are prepared by one-step carbonization of renewable wood. With the increase in carbonization temperature, the conductivity and EMI performance of WC increase gradually. At the same carbonization temperature, the denser WC has better conductivity and higher EMI performance. In addition, due to the layered superimposed conductive channel structure, the WC in the vertical-section shows better EMI shielding performance than that in the cross-section. After excluding the influence of thickness and density, the specific EMI shielding effectiveness (SSE/t) value can be calculated to further optimize tree species. We further discuss the mechanism of the influence of the microstructure of WC on its EMI shielding properties. In addition, the lightweight WC EMI material also has good hydrophobicity and heat insulation properties, as well as good mechanical properties.
随着电磁辐射污染的增加，有必要开发低成本、可再生的电磁干扰（EMI）屏蔽材料。本文通过可再生木材的一步碳化法制备了用于 EMI 屏蔽的木材衍生碳（WC）材料。随着碳化温度的升高，WC 的电导率和 EMI 性能逐渐增加。在相同的碳化温度下，密度更高的 WC 具有更好的导电性和更高的 EMI 性能。此外，由于层状叠加的导电通道结构，垂直截面的 WC 比横截面上的 WC 具有更好的 EMI 屏蔽性能。在排除厚度和密度的影响后，可以计算出特定 EMI 屏蔽效能（SSE/t）值，以进一步优化树种。我们进一步讨论了 WC 微观结构对其 EMI 屏蔽性能的影响机制。此外，轻质 WC EMI 材料还具有良好的疏水性和隔热性能，以及良好的机械性能。
