Zhao Man, Xiao He, Chen Shuai, Hu Tianjun, Jia Jianfeng, Wu Haishun
Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, Shanxi Normal University Linfen China 041004
The School of Chemical and Material Science, Shanxi Normal University No. 1, Gongyuan Street Linfen China 041004.
RSC Adv. 2018 Apr 9;8(24):13148-13153. doi: 10.1039/c8ra02648c.
Improving the ferromagnetism properties of pure carbon-based materials is extremely important for their application in spintronics. Hydrogenation of graphene is an effective way to induce magnetic moment into graphene with the advantage of reversibility. However, little experimental work has been done to prove the effect of hydrogen on the magnetic properties of graphene so far, except for systems containing a large amount of oxygen or plasma-induced vacancy which complicated the magnetic origin. Here we report a facile electrochemical cathodic method to generate hydrogenated multilayer graphene or few-layer graphite using graphite powder as the raw material, and observed hydrogen-induced ferromagnetism in samples annealed at different temperatures. The observed results suggest that ferromagnetism of hydrogenated multilayer graphene can be tuned by high temperature treatment, which is attributed to a changeable relative amount of hydrogen atoms chemisorpted on two different sublattices during thermal treatment.
改善纯碳基材料的铁磁性对于其在自旋电子学中的应用极为重要。石墨烯氢化是一种将磁矩引入石墨烯的有效方法，具有可逆性的优点。然而，到目前为止，除了含有大量氧或等离子体诱导空位的体系（这些体系使磁起源复杂化）外，几乎没有实验工作来证明氢对石墨烯磁性的影响。在此，我们报道一种简便的电化学阴极方法，以石墨粉为原料制备氢化多层石墨烯或少层石墨，并观察到在不同温度下退火的样品中存在氢诱导的铁磁性。观察结果表明，氢化多层石墨烯的铁磁性可通过高温处理进行调控，这归因于热处理过程中化学吸附在两个不同亚晶格上的氢原子相对数量的变化。
