Ultraviolet-visible spectroscopy of graphene oxides
By Q. Lai, Shifu Zhu, Xueping Luo, M. Zou, S. Huang. 2012
355 citations recorded by the source corpus.
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 π-π* plasmon peak.
Subfields: Biomedical Engineering, Electronic, Optical and Magnetic Materials, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/9c3716e007d72e29b8ea2394d035bab7ce1ff079
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In Materials Chemistry
Citations in the corpus
- Ultrasonic exfoliation of graphene in water: A key parameter study (2020, background): “[64,65], indicating that the as-obtained FLG flakes were not oxidized up to the level that can be detected by UVevis.”