Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, and School of Physics and Electronic Engineering, Harbin Normal University , Harbin 150025, China.
ACS Appl Mater Interfaces. 2018 Jan 10;10(1):1399-1407. doi: 10.1021/acsami.7b15559. Epub 2017 Dec 19.
Herein we develop a facile strategy for fabricating nickel particle encapsulated in few-layer nitrogen-doped graphene supported by graphite carbon sheets as a high-performance electromagnetic wave (EMW) absorbing material. The obtained material exhibits sheetlike morphology with a lateral length ranging from a hundred nanometers to 2 μm and a thickness of about 23 nm. Nickel nanoparticles with a diameter of approximately 20 nm were encapsulated in about six layers of nitrogen-doped graphene. As applied for electromagnetic absorbing material, the heteronanostructures exhibit excellent electromagnetic wave absorption property, comparable to most EMW absorbing materials previously reported. Typically, the effective absorption bandwidth (the frequency region falls within the reflection loss below -10 dB) is up to 8.5 GHz at the thicknesses of 3.0 mm for the heteronanostructures with the optimized Ni content. Furthermore, two processes, carbonization at a high temperature and subsequent treatment in hot acid solution, were involved in the preparation of the heteronanostructures, and thus, mass production was achieved easily, facilitating their practical applications.
在此，我们开发了一种简便的策略，用于制造封装在由石墨碳片支撑的少层氮掺杂石墨烯中的镍颗粒，作为一种高性能电磁波（EMW）吸收材料。所得到的材料具有片状形态，横向长度从几百纳米到 2 微米，厚度约为 23 纳米。镍纳米颗粒的直径约为 20 纳米，封装在大约六层氮掺杂石墨烯中。作为电磁波吸收材料，异质纳米结构表现出优异的电磁波吸收性能，可与之前报道的大多数电磁波吸收材料相媲美。通常，在厚度为 3.0 毫米时，具有优化的 Ni 含量的异质纳米结构的有效吸收带宽（反射损耗低于-10 dB 的频率区域）高达 8.5 GHz。此外，异质纳米结构的制备涉及高温碳化和随后在热酸溶液中的处理两个过程，因此可以轻松实现大规模生产，有利于其实际应用。
