Facile and fast synthesis of graphene oxide nanosheets via bath ultrasonic irradiation
Facile and fast synthesis of graphene oxide nanosheets via bath ultrasonic irradiation
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DOI：
10.1016/j.jcis.2014.06.055
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发表时间：
2014-10-15
影响因子：
9.9
通讯作者：
Entezari, M. H.
中科院分区：
文献类型：
--
作者：
Esmaeili, A.;Entezari, M. H.
这项工作首次报道了一种通过氧化石墨(G)合成氧化石墨烯纳米片(GO)的简便的超声波化学方法。采用超声浴辐射(GO-U)的方法快速合成了GO。相比之下，经典方法(GO-C)在与超声波法相同的条件下合成GO。产物完全不同，氧化过程与超声波法完全不同。此外，GO的合成是基于最常用的经典方法(GO-C‘)，而不是在与超声波法相同的条件下。采用紫外-可见光谱、傅里叶变换红外光谱、X射线衍射仪、透射电子显微镜、热重分析和拉曼光谱等技术对氧化膜进行了表征。X-射线衍射仪证实了GO-U和GO-C‘片层之间的间距大于石墨。此外，X射线衍射仪还表明，GO-U的片层比GO-C少。透射电子显微镜观察证实了纳米片材的合成。UV-Vis结果显示，GO-U和GO-C‘的吸收峰位于230 nm，GO-C的吸收峰位于245 nm，G的吸收峰位于255 nm。GO-U相对于G和GO-C的蓝移可以解释为GO-U中的sp(3)/sp(2)比G和Go-C具有更高的特征。FT-IR表征了氧化石墨烯的含氧官能团。拉曼光谱观察到面内sp(2)磁畴的尺寸减小。对G、GO-U和GO-C‘的BET分析证实，GO-U具有最高的比表面积。因此，即使是低强度的超声波浴法也在氧化石墨烯纳米片的合成中起着基础性的作用，而且与经典方法相比，它具有相对快速、简单、经济和高效的特点。(C)2014 Elsevier Inc.保留所有权利。
For the first time, this work reports a facile sonochemical route in the synthesis of graphene oxide nanosheets (GO) via oxidation of graphite (G). The synthesis of GO was carried out in a fast way under ultrasonic bath irradiation (GO-U). In comparison, the synthesis of GO via classical method (GO-C) was done under the same conditions as ultrasonic method. The products were completely different and the oxidation did not happen the same as way as ultrasonic method. Furthermore, GO was synthesized based on classical approach that most commonly used (GO-C'), not under the same conditions as ultrasonic method. The GO sheets were characterized using UV-Vis, Fourier transform infrared (FT-IR), X-ray diffraction (XRD), transmission electron microscope (TEM), thermal gravimetry (TG), and Raman spectroscopy techniques. The XRD confirms that the spaces between GO-U and GO-C' sheets were higher than graphite. Also, XRD indicated that the GO-U has fewer sheets rather than GO-C'. The TEM observations were confirmed the synthesis of nanosheets. The UV-Vis results were shown the absorption peaks at 230 nm for GO-U and GO-C', at 245 nm for GO-C, and at 255 nm for G. The blue shift in GO-U with respect to G and GO-C can be interpreted based on the higher character of sp(3)/sp(2) in GO-U than G and GO-C. The FT-IR presents the oxygenated functional groups on graphene oxide sheets. A reduction in size of the in-plane sp(2) domains was observed by Raman spectrum. The BET analysis for G, GO-U and GO-C' confirmed that GO-U has a highest specific surface area among all the samples. Therefore, the ultrasonic bath method even with low intensity has a fundamental role in the synthesis of graphene oxide nanosheets and it is relatively fast, simple, cost-effective and efficient as compared to the classical method. (C) 2014 Elsevier Inc. All rights reserved.