Zhang Qiang, Yang Yuying, Fan Huiqing, Feng Liu, Wen Guangwu, Qin Lu-Chang
College of Chemistry and Chemical Engineering, Shandong University of Technology China.
College of Materials Science and Engineering, Shandong University of Technology China.
RSC Adv. 2021 Apr 28;11(26):15808-15816. doi: 10.1039/d0ra10026a. eCollection 2021 Apr 26.
The functional groups and physical properties of graphene oxide (GO) are found to be sensitive to and can be controlled by the water content in the reactions when GO samples are prepared at different concentrations of sulfuric acid using a modified Hummers method. GO prepared with 93% sulfuric acid (HSO) showed fewer structural defects, less π-π conjugation, and larger interlayer spacing than GO prepared with 99% HSO. The intensity ratio of the D-band to the G-band of the Raman spectrum is 0.89 ± 0.01 and 1.02 ± 0.01, corresponding to average interlayer spacing of 0.91 nm and 0.86 nm, respectively. The yield and carbon to oxygen ratio of the GO sheets prepared from different concentrations of HSO are nearly identical. More importantly, compared with GO synthesized with 99% HSO, GO prepared with 93% HSO contains more carbon-oxygen single bonds, such as epoxy groups and hydroxyl groups, but fewer carbonyl groups.
当使用改进的Hummers方法在不同浓度的硫酸中制备氧化石墨烯（GO）样品时，发现氧化石墨烯的官能团和物理性质对反应中的含水量敏感且可由其控制。用93%硫酸（H₂SO₄）制备的GO比用99% H₂SO₄制备的GO具有更少的结构缺陷、更少的π-π共轭和更大的层间距。拉曼光谱中D带与G带的强度比分别为0.89±0.01和1.02±0.01，对应的平均层间距分别为0.91nm和0.86nm。由不同浓度H₂SO₄制备的GO片材的产率和碳氧比几乎相同。更重要的是，与用99% H₂SO₄合成的GO相比，用93% H₂SO₄制备的GO含有更多的碳氧单键，如环氧基和羟基，但羰基较少。
