Mechanistic aspects of the radiation-chemical reduction of graphene oxide to graphene-like materials
Mechanistic aspects of the radiation-chemical reduction of graphene oxide to graphene-like materials
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DOI：
10.3109/09553002.2014.907934
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发表时间：
2014-06-01
影响因子：
2.6
通讯作者：
Abel, Bernd
中科院分区：
文献类型：
--
作者：
Flyunt, Roman;Knolle, Wolfgang;Abel, Bernd
目的：研究利用电子束（EB）产生的还原自由基还原水中氧化石墨烯（GO）制备类石墨烯材料（GLM）的机理细节。材料和方法：采用10 MeV直线加速器在常温下辐照氧化石墨烯水相分散体。采用紫外-可见光谱法对氧化石墨烯还原动力学进行了研究。用x射线光电子能谱（XPS）、透射电子显微镜（TEM）、拉曼光谱（Raman）和电导率测量对所得GLM进行了表征。结果：在室温下，氧化石墨烯与EB辐照产生的还原自由基反应可在数分钟内实现高效还原。通过对还原机制的详细研究，可以从效率和前体及最终产物的环境影响两方面选择出最佳的还原自由基。结论：采用eb处理水相氧化石墨烯分散体是一种高效、环保、经济且易于扩展的制备GLM的方法。新方法的效率可与现有的最佳方法相媲美。
Purpose: The aim of the work was to investigate mechanistic details of the preparation of graphene-like materials (GLM) via reduction of graphene oxide (GO) in aqueous dispersions by electron beam (EB) generated reducing free radicals.Materials and methods: A 10 MeV linear accelerator was employed to irradiate aqueous GO dispersions at ambient temperatures. The kinetics of GO reduction was followed using UV-Vis spectroscopy. The resulting GLM were characterized by X-ray photoelectron spectroscopy (XPS), Transmission electron microscopy (TEM), Raman spectroscopy and conductivity measurements.Results: The reduction of GO could be afforded with high efficiency within minutes at room temperature via the reaction of GO with reducing radicals generated by EB irradiation. The detailed investigation of the reduction mechanism allowed a selection of the best reducing free radicals in terms of both their efficiency and environmental impact of their precursors and final products.Conclusions: The EB-treatment of aqueous GO dispersions is a highly efficient, environmentally friendly, cost-effective and easily up-scalable method for the preparation of GLM. The efficiency of the new reduction approach is comparable with the best existing methods.