Quantitative investigation of the fragmentation process and defect density evolution of oxo-functionalized graphene due to ultrasonication and milling
Quantitative investigation of the fragmentation process and defect density evolution of oxo-functionalized graphene due to ultrasonication and milling
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DOI：
10.1016/j.carbon.2015.10.021
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发表时间：
2016-01-01
期刊：
影响因子：
10.9
通讯作者：
Peukert, Wolfgang
中科院分区：
文献类型：
--
作者：
Halbig, Christian E.;Nacken, Thomas J.;Peukert, Wolfgang
从技术和医学应用的角度来看，我们第一次检查了具有几乎完整的碳晶格（oxo-G）的氧代官能化石墨烯的超声处理和球磨对碳晶格中横向薄片尺寸减小和缺陷形成的影响。这两种方法的能量输入进行了筛选，其特征在于在溶液中的横向薄片尺寸分布的定量变化，通过分析超离心（AUC）支持原子力显微镜（AFM）。对于第一次，我们应用统计拉曼光谱可靠地评估晶格缺陷的形成与处理时间。令人惊讶的是，晶格缺陷的密度保持不受能量输入低于极限阈值的影响。此外，对于这两种加工技术，根据幂律函数，尺寸减小与能量输入成比例，这对于乳化和机械粉碎过程是众所周知的。根据这项研究的结果，可以在超声处理或研磨处理后精确地预先确定oxo-G薄片的横向尺寸，从而保留碳晶格。了解oxo-G薄片的这种受控形成，可以实现具有定制特性的目标导向技术，医疗和电子应用。(C)2015爱思唯尔有限公司版权所有。
In the view of technical and medical applications we examined the effect of ultrasonication and ball milling of oxo-functionalized graphene bearing an almost intact carbon lattice (oxo-G) with respect to the lateral flake size reduction and defect formation in the carbon lattice for the first time. The energy input was screened for both methods and quantitative changes in lateral flake size distribution were characterized in solution by analytical ultracentrifugation (AUC) supported by atomic force microscopy (AFM). For the first time, we applied statistical Raman spectroscopy to reliably evaluate the formation of lattice defects with processing time. Surprisingly, the density of lattice defects remains unaffected with energy inputs below a limiting threshold. Furthermore, for both processing techniques, the size reduction scales with the energy input according to a power law function, which is well known for emulsification and mechanical comminution processes. With the results of this study it is possible to precisely predetermine the lateral size of flakes of oxo-G upon sonication or milling processing, preserving the carbon lattice. Understanding this controlled formation of oxo-G flakes enables target oriented technical, medical and electronic applications with tailored properties. (C) 2015 Elsevier Ltd. All rights reserved.