期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 38, 页码 21356-21363出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b06008
关键词
graphene oxide; manganese dioxide; potassium permanganate; hydrogels; ion intercalated exfoliation
资金
- National Nature Science Foundation of China [20805035]
- Fundamental Research Funds for the Central Universities [2042014kf0244]
- Natural Science Foundation of Hubei Province [2015CFB538]
- Large-scale Instrument and Equipment Sharing Foundation of Wuhan University
Potassium permanganate (KMnO4) has been proved to be an efficient oxidant for converting graphite into graphite oxide, but its slow diffusion in the interlayer of graphite seriously restricts the production of graphene oxide (GO). Here, we demonstrate that the preoxidation of graphite by impure manganese dioxide (MnO2) in a mixture of concentrated sulfuric acid (H2SO4) and phosphorus pentoxide (P2O5) can efficiently improve the synthesis of GO when KMnO4 is employed as the oxidant. The prepared honey-like GO hydrogels possess a high yield of single-layer sheets, large sizes (average lateral size up to 20 mu m), wide ranges of stable dispersion concentrations (from dilute solutions, viscous hydrogels, to dry films), and good conductivity after reduction (similar to 2.9 x 10(4) S/m). The mechanism for the improved synthesis of GO by impure MnO2 was explored. The enhanced exfoliation and oxidation of graphite by oxidative Mn ions (mainly Mn3+), which are synergistically produced by the reaction of impure MnO2 with H2SO4 and P2O5, are found to be responsible for the improved synthesis of such GO hydrogels. Particularly, preoxidized graphite (POG) can be partially dispersed in water with sonication, which allows the facile construction of flexible and highly conductive graphene nanosheet film electrodes with excellent electrochemical sensing properties.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据