Photochemical Engineering of Graphene Oxide Nanosheets
Photochemical Engineering of Graphene Oxide Nanosheets
复制标题
DOI：
10.1021/jp305403r
复制
发表时间：
2012-09-20
影响因子：
3.7
通讯作者：
Matsumoto, Yasumichi
中科院分区：
文献类型：
--
作者：
Koinuma, Michio;Ogata, Chikako;Matsumoto, Yasumichi
氧化石墨烯（GO）的许多独特性质强烈地依赖于氧化官能团和形貌。在这里，光反应过程被证明是非常有用的控制这些因素。我们报道了在室温下，在紫外光照射下，通过在O-2中的光反应在多孔GO中快速、简单地制备纳米孔。使用X射线光电子能谱的定量分析表明，在含氧基团（sp（3）碳键）的区域中产生纳米孔，产生多孔还原氧化石墨烯（rGO）。根据含氧基团数量的变化提出了光反应机理。质子传导发生在原始GO中的环氧基的基面，即使在低湿度下，并且在高湿度下在多孔rGO的羧基处。因此，通过控制光反应条件，可以容易地制造具有各种形貌、含氧官能团和导电类型的GO和rGO样品。
Many unique properties of graphene oxide (GO) strongly depend on the oxygenated functional groups and morphologies. Here, the photoreaction process is demonstrated to be very useful to control these factors. We report the fast, simple production of nanopores in porous GO via photoreaction in O-2 under UV irradiation at room temperature. Quantitative analysis using X-ray photoelectron spectroscopy showed that nanopores were produced in areas of oxygenated groups (sp(3) carbon bonds), creating porous reduced graphene oxide (rGO). The photoreaction mechanism was proposed on the basis of changes in the number of oxygenated groups. Proton conduction occurred the basal plane of epoxide groups in virgin GO, even at low humidity, and at carboxyl groups for porous rGO at high humidity. Thus, GO and rGO samples with various morphologies, oxygenated functional groups, and conduction types can be easily fabricated by controlling the photoreaction conditions.