Ultraviolet-visible spectroscopy of graphene oxides

作者：Lai Qi; Zhu Shifu^*; Luo Xueping; Zou Min; Huang Shuanghua

来源：AIP Advances, 2012, 2(3): 032146.

DOI：10.1063/1.4747817

Dispersions of few-layer (1-3 layers), multi-layer (4-10 layers) and thick-layer (>10 layers) graphene oxide (GO) were prepared by a modified Hummers method with different mass ratios of KMnO4 to graphite. Ultraviolet-visible (UV-vis) spectroscopic data show that few-layer GO dispersions can be distinguished from multi- and thick-layer dispersions by a more intense peak at 230 nm. Atomic force microscopy (AFM) images of few-layer GO contain a single peak, those of multi-layer GO exhibit a shoulder and those of thick-layer GO do not contain a peak or shoulder. These findings allow qualitative analysis of GO dispersions. X-ray photoelectron spectra (XPS) show that the change of UV-vis absorption intensity of GO is caused by a conjugative effect related to chromophore aggregation that influences the pi-pi* plasmon peak.

• 出版日期2012-9
• 单位四川大学; 攀枝花学院