中国物理B ›› 2017, Vol. 26 ›› Issue (10): 106101-106101.doi: 10.1088/1674-1056/26/10/106101

• CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES • 上一篇    下一篇

Preparation of graphene oxides with different sheet sizes by temperature control

Zhe Qian(钱哲), Liang Chen(陈亮), De-Yuan Li(李德远), Bing-Quan Peng(彭兵权), Guo-Sheng Shi(石国升), Gang Xu(徐刚), Hai-Ping Fang(方海平), Ming-Hong Wu(吴明红)   

  1. 1. School of Environment and Chemical Engineering, Shanghai University, Shanghai 200444, China;
    2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • 收稿日期:2017-04-01 修回日期:2017-07-13 出版日期:2017-10-05 发布日期:2017-10-05
  • 通讯作者: Guo-Sheng Shi, Guo-Sheng Shi, Gang Xu E-mail:shiguosheng@sinap.ac.cn;xugang@t.shu.edu.cn;mhwu@mail.shu.edu.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 41473090, 41430644, 11675098, 41373098, 41430644, and 21490585).

Preparation of graphene oxides with different sheet sizes by temperature control

Zhe Qian(钱哲)1, Liang Chen(陈亮)1,2, De-Yuan Li(李德远)1,2, Bing-Quan Peng(彭兵权)1, Guo-Sheng Shi(石国升)2, Gang Xu(徐刚)1, Hai-Ping Fang(方海平)2, Ming-Hong Wu(吴明红)1   

  1. 1. School of Environment and Chemical Engineering, Shanghai University, Shanghai 200444, China;
    2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
  • Received:2017-04-01 Revised:2017-07-13 Online:2017-10-05 Published:2017-10-05
  • Contact: Guo-Sheng Shi, Guo-Sheng Shi, Gang Xu E-mail:shiguosheng@sinap.ac.cn;xugang@t.shu.edu.cn;mhwu@mail.shu.edu.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 41473090, 41430644, 11675098, 41373098, 41430644, and 21490585).

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摘要：

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 μm and 7 μm 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.

关键词: graphene oxide, sheet size, temperature control, degree of oxidation

Abstract:

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 μm and 7 μm 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.

Key words: graphene oxide, sheet size, temperature control, degree of oxidation

中图分类号:  (Structure of graphene)

  • 61.48.Gh
81.40.-z (Treatment of materials and its effects on microstructure, nanostructure, And properties) 68.37.-d (Microscopy of surfaces, interfaces, and thin films)