以还原氧化石墨烯为前驱体,采用一步水热法成功制备出了近似球状、分散性良好、尺寸均一的石墨烯量子点.通过傅立叶红外光谱(FTIR)、紫外-可见吸收光谱、荧光光谱等光学手段对样品的结构和光学性能进行了表征,结果显示制备的石墨烯量子点表面含有丰富的含氧官能团,在紫外区有很强的吸收,发射峰强而窄,表现出激发波长不依赖的荧光性能.研究结果表明石墨烯量子点可应用于Mn2+微量探测,石墨烯量子点的荧光强度会随着所加入的Mn2+浓度的增大而降低,在0~400 μmol/L间的校准曲线呈线性相关.

Using reduced oxide graphene (RGO) as precursor,the monodispersed spherical graphene quantum dots (GQDs) with uniform size were prepared by one-step hydrothermal method.The morphology,structure and optical properties of the samples were characterized by TEM,AFM,FTIR,UV-visible spectroscopy and photoluminescence spectra.The GQDs that contain many oxygen functional groups on their surface show a strong absorption band at UV region,and a very strong,narrow and excitation-independent emission peak.When Mn2+ ions were added into the GQDs solution,the fluorescence significantly quenched with the concentration of Mn2+.The calibration curve is linear over the range of 0-400 μmol/L.The result indicates that GQDs can serve as a fluorescent sensing platform for Mn2+ detection.