Islam Faridul, Tahmasebi Arash, Wang Rou, Yu Jianglong
Chemical Engineering, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia.
Suzhou Industrial Park Monash Research Institute of Science and Technology, Southeast University-Monash University Joint Graduate School, Suzhou 215000, China.
Nanomaterials (Basel). 2021 Jun 25;11(7):1672. doi: 10.3390/nano11071672.
Metal-supported few-layer graphene (FLG) was synthesized via microwave-assisted catalytic graphitization owing to the increasing demand for it and its wide applications. In this study, we quickly converted earth-abundant and low-cost bituminous coal to FLG over Fe catalysts at a temperature of 1300 °C. X-ray diffraction, Raman spectroscopy, transmission electron microscopy, and N adsorption-desorption experiments were performed to analyze the fabricated metal-supported FLG. The results indicated that the microwave-irradiation temperature at a set holding-time played a critical role in the synthesis of metal-supported FLG. The highest degree of graphitization and a well-developed pore structure were fabricated at 1300 °C using a S10% Fe catalyst for 20 min. High-resolution transmission electron microscopy analysis confirmed that the metal-supported FLG fabricated via microwave-assisted catalytic graphitization consisted of 3-6 layers of graphene nanosheets. In addition, the 2D band at 2700 cm in the Raman spectrum of the fabricated metal-supported FLG samples were observed, which indicated the presence of few-layer graphene structure. Furthermore, a mechanism was proposed for the microwave-assisted catalytic graphitization of bituminous coal. Here, we developed a cost-effective and environmental friendly metal-supported FLG method using a coal-based carbonaceous material.
由于对金属支撑的少层石墨烯（FLG）的需求不断增加及其广泛应用，通过微波辅助催化石墨化合成了金属支撑的少层石墨烯。在本研究中，我们在1300℃的温度下，以铁催化剂将储量丰富且成本低廉的烟煤快速转化为FLG。进行了X射线衍射、拉曼光谱、透射电子显微镜和N吸附-脱附实验，以分析制备的金属支撑的FLG。结果表明，在设定的保温时间下，微波辐射温度在金属支撑的FLG的合成中起着关键作用。使用10%的S铁催化剂在1300℃下反应20分钟，制备出了最高程度的石墨化和发达的孔隙结构。高分辨率透射电子显微镜分析证实，通过微波辅助催化石墨化制备的金属支撑的FLG由3-6层石墨烯纳米片组成。此外，在所制备的金属支撑的FLG样品的拉曼光谱中观察到了2700 cm处的二维带，这表明存在少层石墨烯结构。此外，还提出了烟煤微波辅助催化石墨化的机理。在此，我们开发了一种使用煤基碳质材料的具有成本效益且环境友好的金属支撑的FLG方法。
