Microfluidic Oxidation of Graphite in Two Minutes with Capability of Real‐Time Monitoring
Microfluidic Oxidation of Graphite in Two Minutes with Capability of Real‐Time Monitoring
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DOI：
10.1002/adma.202107083
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发表时间：
2022-02
影响因子：
29.4
通讯作者：
Chuanren Ye;Gang Wang;Hong Yuan;Jieyun Li;Kun Ni;Fei Pan;M. Guo;Yanhong Wu;Hengxing Ji;Fan Zhang;Bill Qu;Z. Tang;Yanwu Zhu
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文献类型：
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作者：
Chuanren Ye;Gang Wang;Hong Yuan;Jieyun Li;Kun Ni;Fei Pan;M. Guo;Yanhong Wu;Hengxing Ji;Fan Zhang;Bill Qu;Z. Tang;Yanwu Zhu
氧化石墨及其剥离的对应物氧化石墨烯是大规模生产石墨烯基材料和许多相关应用的重要前体。由于反应器体积大和能量交换慢，目前的氧化石墨的间歇式制备存在安全问题、反应时间长和产品质量不均匀。微通道中的反应由于增强的传质和极快的能量交换而大大提高了石墨的氧化效率，通过微通道在0.2min内实现了石墨的可控氧化。综合表征表明，通过微流体策略获得的氧化石墨烯具有实验室烧杯和工业反应器中制备的氧化石墨烯的特征，但具有较高的氧化度和更多的环氧基。更重要的是，微流体制备允许通过拉曼光谱法在线监测氧化，为反应条件和产品质量的动态控制做好准备。连续制备的能力也通过显示纤维的组装和氧化石墨烯在微流体通道中的还原以及从微流体策略制备的氧化石墨烯用于导热和导电膜的适用性来证明。
Graphite oxide and its exfoliated counterpart, graphene oxide, are important precursors for the large‐scale production of graphene‐based materials and many relevant applications. The current batch‐style preparation of graphite oxide suffers from safety concern, long reaction time, and nonuniform product quality, due to the large volume of reactors and slow energy exchange. Reaction in microchannels can largely enhance the oxidization efficiency of graphite due to the enhanced mass transfer and extremely quick energy exchange, by which the controllable oxidization of graphite is achieved in ≈2 min. Comprehensive characterizations show that the graphene oxide obtained through the microfluidic strategy has features like those prepared in laboratory beakers and industrial reactors, yet with the higher oxidization degree and more epoxy groups. More importantly, the microfluidic preparation allows for on‐line monitoring of the oxidization by Raman spectroscopy, ready for the dynamical control of reaction condition and product quality. The capability of continuous preparation is also demonstrated by showing the assembly of fibers and reduction of graphene oxide in microfluidic channels, and the applicability of graphene oxide prepared from the microfluidic strategy for thermally and electrically conductive films.