单壁碳纳米管超声裂解制备石墨烯纳米带

Preparation of graphene nanoribbons based on unzipping single-walled carbon nanotubes by sonication

将单壁碳纳米管仅通过气相氧化和超声裂解两步制备出了石墨烯纳米带,采用透射电子显微镜(TEM)、原子力显微镜(AFM)、拉曼光谱(Raman)对制备出的石墨烯纳米带进行形貌和结构分析。结果表明,此方法制备的石墨烯纳米带宽度狭窄、边缘光滑,并且相比于刚性的单壁碳纳米管具有良好的柔韧性,大约为2nm的厚度也说明了石墨烯纳米带的双层结构。在气相氧化和超声裂解的过程中,拉曼光谱中D峰与G峰的比值始终保持在0.15左右,表明在整个制备过程中,并没有引入新的缺陷。此方法相比于其他方法制备出的纳米带具有结晶度高、宽度狭窄、边缘光滑等优点。

Single-walled carbon nanotubes （SWNTs） were unzipped into graphene nanoribbons （GNRs） by gas phase oxidation and sonication. Transmission electron microscope （TEM）, atomic force microscope （AFM） and Raman spectra （Raman） were used to characterize the morphology and microstructure of GNRs. The results showed that the GNRs with narrow width and smooth edges are obtained and outperform rigid SWNTs in flexibility. The width of 12 nm also shows that the GNRs are bilay- ered. Moreover, the intensity ratio of peak D to peak G in Raman keeps stable at 0. 15 during the processes of gas-phase oxidation and sonication, indicating that the oxidation is very mild and does not bring new defects. Compared with other methods, GNRs in this way have such advantages as high quality, narrow width and smooth edges.