Preparation of graphene oxides with different sheet sizes by temperature control
Preparation of graphene oxides with different sheet sizes by temperature control
复制标题
控温制备不同片材尺寸的氧化石墨烯
DOI：
10.1088/1674-1056/26/10/106101
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发表时间：
2017-09
影响因子：
1.7
通讯作者：
Wu M. H.
中科院分区：
文献类型：
--
作者：
Qian Z.;Chen L.;Li D. Y.;Peng B. Q.;Shi G. S.;Xu G.;Fang H. P.;Wu M. H.
氧化石墨烯（GO）的片尺寸可以极大地影响其电学、光学、机械、电化学和催化性能。在不同的应用领域中，如何控制板材的尺寸是板材制备过程中面临的一个关键挑战。根据我们前期对温度对石墨烯氧化过程影响的理论计算，采用Hummers法，通过简单控制高锰酸钾（KMnO 4）氧化石墨烯过程中的温度条件和去离子水稀释过程，制备出不同片尺寸的石墨烯。透射电子显微镜（TEM）和原子力显微镜（AFM）检测结果表明，不同温度下制备的GO片的平均尺寸分别约为1 μ m和7 μ m。紫外-可见光谱（UV-vis）分析表明，较低的温度可以降低GO的氧化程度，减少GO表面的含氧官能团。此外，我们制备GO膜以通过超声波测试它们的机械强度，并且我们发现在低温下制备的GO膜的强度显著高于在高温下制备的那些，显示较大GO片的高机械强度。我们的实验结果验证了我们以前的理论计算。与传统的离心分离法和化学切割法相比，温控法制备GO工艺简单、成本低，且可实现大尺寸合成。这些发现为大规模潜在应用开发了控制GO片尺寸的新方法。
The sheet size of a graphene oxide (GO) can greatly influence its electrical, optical, mechanical, electrochemical and catalytic property. It is a key challenge to how to control the sheet size during its preparation in different application fields. According to our previous theoretical calculations of the effect of temperature on the oxidation process of graphene, we use Hummers method to prepare GOs with different sheet sizes by simply controlling the temperature condition in the process of the oxidation reaction of potassium permanganate (KMnO4) with graphene and the dilution process with deionized water. The results detected by transmission electron microscopy (TEM) and atomic force microscopy (AFM) show that the average sizes of GO sheets prepared at different temperatures are about 1 mu m and 7 mu m respectively. The ultraviolet-visible spectroscopy (UV-vis) shows that lower temperature can lead to smaller oxidation degrees of GO and less oxygen functional groups on the surface. In addition, we prepare GO membranes to test their mechanical strengths by ultrasonic waves, and we find that the strengths of the GO membranes prepared under low temperatures are considerably higher than those prepared under high temperatures, showing the high mechanical strengths of larger GO sheets. Our experimental results testify our previous theoretical calculations. Compared with the traditional centrifugal separation and chemical cutting method, the preparation process of GO by temperature control is simple and low-cost and also enables large-size synthesis. These findings develop a new method to control GO sheet sizes for large-scale potential applications.
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