A Comparative Study of Particle Size Distribution of Graphene Nanosheets Synthesized by an Ultrasound-Assisted Method
A Comparative Study of Particle Size Distribution of Graphene Nanosheets Synthesized by an Ultrasound-Assisted Method
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DOI：
10.3390/nano9020152
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发表时间：
2019-02-01
期刊：
影响因子：
5.3
通讯作者：
Romero-Salguero, Francisco J.
中科院分区：
文献类型：
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作者：
Amaro-Gahete, Juan;Benitez, Almudena;Romero-Salguero, Francisco J.
基于石墨烯的材料因其优异的化学、物理和机械性能而备受关注，这使得它们在不同的工业应用中作为特权材料非常有用。超声波化学方法可以生产低缺陷的石墨烯材料，这是某些用途的首选。用超声波探头剥离商业微型石墨(MG)制备了石墨烯纳米片(GNS)。利用X射线衍射仪、透射电子显微镜、拉曼光谱和X射线光电子能谱等测试手段对两种材料进行了表征。它们都揭示了剥离的石墨烯纳米片的形成，其表面特征与原始石墨相似，但微晶尺寸和层数减少。采用动态光散射(DLS)、纳米颗粒跟踪分析(NTA)和非对称流场流动分馏(AF4)等分析技术对纳米颗粒的粒度分布进行了详尽的研究。对这些技术提供的结果进行了比较。NTA和AF4的分辨率高于DLS。AF4已被证明是一种分离不同大小GN的精确分析技术。
Graphene-based materials are highly interesting in virtue of their excellent chemical, physical and mechanical properties that make them extremely useful as privileged materials in different industrial applications. Sonochemical methods allow the production of low-defect graphene materials, which are preferred for certain uses. Graphene nanosheets (GNS) have been prepared by exfoliation of a commercial micrographite (MG) using an ultrasound probe. Both materials were characterized by common techniques such as X-ray diffraction (XRD), Transmission Electronic Microscopy (TEM), Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). All of them revealed the formation of exfoliated graphene nanosheets with similar surface characteristics to the pristine graphite but with a decreased crystallite size and number of layers. An exhaustive study of the particle size distribution was carried out by different analytical techniques such as dynamic light scattering (DLS), nanoparticle tracking analysis (NTA) and asymmetric flow field flow fractionation (AF4). The results provided by these techniques have been compared. NTA and AF4 gave higher resolution than DLS. AF4 has shown to be a precise analytical technique for the separation of GNS of different sizes.