Inducing ferromagnetism into graphene is vital today because it has a wide range of applications such as spintronics devices and magnetic memory devices. In this paper, we will report a new method to synthesize ferrom...Inducing ferromagnetism into graphene is vital today because it has a wide range of applications such as spintronics devices and magnetic memory devices. In this paper, we will report a new method to synthesize ferromagnetic graphene by nitrogen doping. X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy were utilized to testify the N-doped material and further discuss the N-doped process.The superconducting quantum interference device(SQUID) was put in and used to analyze the magnetic properties of the N-doped graphene sheets. It shows that the material exhibits ferromagnetism at both 3 K and 300 K and the ferromagnetic saturation moment is 0.412 emu/g and 0.051 emu/g, respectively.The mechanism of the origin of the ferromagnetism in N-doped graphene sheets will also be discussed in this paper. It shows that, when the amount graphitic N reached the threshold, the origin of the ferromagnetism will change from defects induced by nitrogen atoms to the transition in energy band caused by graphitic N.展开更多
In this paper,a hydrothermal approach is utilized for the first time in integrating graphene oxide(GO),acetic acid(HAc)and nickel foam to prepare hydrogenated graphene(HG).There are two primary aims of this study:one ...In this paper,a hydrothermal approach is utilized for the first time in integrating graphene oxide(GO),acetic acid(HAc)and nickel foam to prepare hydrogenated graphene(HG).There are two primary aims of this study:one is to ascertain the structure of the as-prepared HG,and the other one is to investigate the ferromagnetism of the HG.Under hydrothermal conditions,GO was reduced and hydrogenated by HAc,while the nickel foam served as a catalyst.This work provides a novel and facile route for the synthesis of hydrogenated graphene,which may lead to the application of hydrogenated graphene in spin electronic devices.展开更多
基金supported by National Natural Science Foundation of China (Nos. 21271082 and 21371068)。
文摘Inducing ferromagnetism into graphene is vital today because it has a wide range of applications such as spintronics devices and magnetic memory devices. In this paper, we will report a new method to synthesize ferromagnetic graphene by nitrogen doping. X-ray photoelectron spectroscopy(XPS) and Raman spectroscopy were utilized to testify the N-doped material and further discuss the N-doped process.The superconducting quantum interference device(SQUID) was put in and used to analyze the magnetic properties of the N-doped graphene sheets. It shows that the material exhibits ferromagnetism at both 3 K and 300 K and the ferromagnetic saturation moment is 0.412 emu/g and 0.051 emu/g, respectively.The mechanism of the origin of the ferromagnetism in N-doped graphene sheets will also be discussed in this paper. It shows that, when the amount graphitic N reached the threshold, the origin of the ferromagnetism will change from defects induced by nitrogen atoms to the transition in energy band caused by graphitic N.
基金supported by National Natural Science Foundation of China(Nos.21271082 and 21371068).
文摘In this paper,a hydrothermal approach is utilized for the first time in integrating graphene oxide(GO),acetic acid(HAc)and nickel foam to prepare hydrogenated graphene(HG).There are two primary aims of this study:one is to ascertain the structure of the as-prepared HG,and the other one is to investigate the ferromagnetism of the HG.Under hydrothermal conditions,GO was reduced and hydrogenated by HAc,while the nickel foam served as a catalyst.This work provides a novel and facile route for the synthesis of hydrogenated graphene,which may lead to the application of hydrogenated graphene in spin electronic devices.
