Nano Carbon Materials Research Group, Korea Electrotechnology Research Institute, Changwon 641-120, Republic of Korea.
ACS Nano. 2011 Feb 22;5(2):870-8. doi: 10.1021/nn102017f. Epub 2011 Jan 24.
In this work, we produced large-area graphene oxide (GO) sheets with fewer defects on the basal plane by application of shear stress in solution to obtain high-quality reduced graphene oxide (RGO) sheets without the need for post-annealing processes. This is described as rheologically derived RGO. The large-area GO sheets were generated using a homogenizer in aqueous solution, which induced slippage of the GO in the in-plane direction during the exfoliation process, in contrast with the conventional sonication method. The effects of chemical reduction under mild conditions demonstrated that the formation of structural defects during the exfoliation process affected the RGO properties. In the Raman spectra, the I(D)/I(G) ratio of the homogenized RGO (HRGO) increased more than that of the sonicated RGO (SRGO) due to the large number of ordered six-fold rings on the basal plane. The enhanced sheet resistance of the HRGO thin film was found to be 2.2 kΩ/sq at 80% transmittance. The effective exfoliation method has great potential for application to high-performance RGO-transparent conducting films.
在这项工作中，我们通过在溶液中施加剪切应力来生产大面积的少层缺陷的氧化石墨烯（GO）片，以获得高质量的还原氧化石墨烯（RGO）片，而无需进行后退火处理。这被描述为流变学衍生的 RGO。大面积 GO 片是在水溶液中使用均化器生成的，在剥离过程中，GO 在面内方向上发生滑移，这与传统的超声方法不同。在温和条件下的化学还原的影响表明，在剥离过程中结构缺陷的形成影响了 RGO 的性质。在拉曼光谱中，由于基面大量的有序六元环，均质化 RGO（HRGO）的 I(D)/I(G)比值增加超过了超声 RGO（SRGO）。发现 HRGO 薄膜的有效薄层电阻在 80%透光率时为 2.2 kΩ/sq。这种有效的剥离方法对于应用于高性能 RGO-透明导电薄膜具有很大的潜力。
