使用热重分析 (TGA) 方法计算石墨烯材料中的碳质假冒品,Analytical Chemistry

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使用热重分析 (TGA) 方法计算石墨烯材料中的碳质假冒品
Analytical Chemistry ( IF 6.7 ) Pub Date : 2021-07-28 , DOI: 10.1021/acs.analchem.1c02662
Dusan Losic _{1,

2} , Farzaneh Farivar _{1,

2} , Pei Lay Yap _{1,

2} , Afshin Karami ₁

Affiliation

石墨烯及其衍生物等高价值先进材料供应链中的假冒产品已成为一个令人担忧的问题，对这个不断发展的新兴行业可能产生负面影响。最近的研究揭示了令人震惊的事实，即市场上的大部分人造石墨烯材料都不是石墨烯，这引起了最终用户的极大关注。石墨烯材料表征的常用和推荐方法，如透射电子显微镜 (TEM)、原子力显微镜 (AFM) 和基于单个石墨烯颗粒的点分析和探测特性的拉曼光谱，仅限于提供大规模“散装”石墨烯粉末的特性以及非石墨烯成分或有意添加的添加剂的识别。这些限制正在通过将低成本黑色碳质材料添加到制造的石墨烯粉末中来创造伪造机会。为了解决这个问题，拥有可靠的表征方法至关重要，该方法可以在大批量探测石墨烯粉末的特定特性，确认其典型的石墨烯特征，并检测不需要的其他化合物的存在，其中热重分析 (TGA) 方法是执行这项具有挑战性的任务的最有前途的方法之一。本文介绍了 TGA 方法的评估及其检测低成本碳添加剂（如石墨、炭黑、生物炭和活性炭）作为石墨烯材料及其衍生物（如氧化石墨烯 (GO) 和还原性石墨烯材料）的潜在伪造材料的能力。走。

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Accounting Carbonaceous Counterfeits in Graphene Materials Using the Thermogravimetric Analysis (TGA) Approach

Counterfeits in the supply chain of high-value advanced materials such as graphene and their derivatives have become a concerning problem with a potential negative impact on this growing and emerging industry. Recent studies have revealed alarming facts that a large percentage of manufactured graphene materials on market are not graphene, raising considerable concerns for the end users. The common and recommended methods for the characterization of graphene materials, such as transmission electron microscopy (TEM), atomic force microscopy (AFM), and Raman spectroscopy based on spot analysis and probing properties of individual graphene particles, are limited to provide the determination of the properties of “bulk” graphene powders at a large scale and the identification of non-graphene components or purposely included additives. These limitations are creating counterfeit opportunities by adding low-cost black carbonaceous materials into manufactured graphene powders. To address this problem, it is critical to have reliable characterization methods, which can probe the specific properties of graphene powders at bulk scale, confirm their typical graphene signature, and detect the presence of unwanted additional compounds, where the thermogravimetric analysis (TGA) method is one of the most promising methods to perform this challenging task. This paper presents the evaluation of the TGA method and its ability to detect low-cost carbon additives such as graphite, carbon black, biochar, and activated carbon as potential counterfeiting materials to graphene materials and their derivatives such as graphene oxide (GO) and reduced GO. The superior performance of the TGA method is demonstrated here, showing its excellent capability to successfully detect these additives when mixed with graphene materials, which is not possible by two other comparative methods (Raman spectroscopy and powder X-ray diffraction (XRD)), which are used as the common characterization methods for graphene materials.

更新日期：2021-08-31

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