高能微波辐照合成类石墨烯氮化碳纳米片的结构特征

以碳纤维为微波吸收剂,基于微波辐照法直接处理三聚氰胺,快速高效地合成类石墨烯结构的氮化碳纳米片。借助于场发射扫描电子显微镜、透射电子显微镜、原子力显微镜、X射线衍射和傅里叶变换红外光谱等分析手段,对微波合成产物进行表征。结果表明:与常规热缩聚合成的石墨相氮化碳相比,高能微波技术合成产物具有明显的纳米片特征,即成功地制备得到类石墨烯结构的氮化碳纳米片。同时,与超声剥离或氧化刻蚀得到的类石墨烯氮化碳纳米片相比,高能微波技术合成产物表面光滑平整,且可发现脆性断裂的现象,呈现出一定的刚性。

Structural feature of graphene-like graphitic carbon nitride nanosheets synthesized via high-energy microwave irradiation

Microwave synthesis has many advantages covering rapid, high-efficient, environmentally-friendly etc . Herein, graphene-like carbon nitride nanosheets (g-C 3N 4-NS) were successfully prepared by high-energy microwave heating method using melamine and carbon fibers as precursor and microwave absorber, respectively. The as-synthesized samples were investigated via various analytic techniques including X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and fourier transform infrared spectroscopy (FT-IR). Results show that the g-C 3N 4-NS sample prepared by microwave heating exhibits the obvious feature of graphene-like ultra-thin nanosheets in comparison with sample synthesized by conventional thermal polycondensation. Meanwhile, compared with graphene-like carbon nitride nanosheets prepared by other approaches including ultrasonic exfoliation and oxidation etching methods, the sample synthesized by microwave heating has smooth, flat and strong rigidity surface.