<br>石墨烯和碳纳米管的热稳定性和纯度：热重分析（TGA）的关键参数,Nanomaterials

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石墨烯和碳纳米管的热稳定性和纯度：热重分析（TGA）的关键参数
Nanomaterials ( IF 4.4 ) Pub Date : 2024-10-31 , DOI: 10.3390/nano14211754
Markus Martincic ₁ , Stefania Sandoval ₁ , Judith Oró-Solé ₁ , Gerard Tobías-Rossell ₁

Affiliation

热分析广泛用于纳米材料的表征。它包含多种技术，允许通过在受控温度下监测材料的响应来评估材料的物理化学性质。对于碳纳米材料，如碳纳米管和石墨烯衍生物，热重分析（TGA）对于确定样品的质量和稳定性、杂质的存在以及合成后处理后的功能化或掺杂程度特别有用。此外，TGA 广泛用于评估对空气氧化的热稳定性，例如，可以通过材料净化和氮掺杂来增强热稳定性，适用于需要延迟材料燃烧的领域。在此，我们评估了在从 TGA 获得的数据中发挥作用的关键参数，即分析过程中使用的气体流速、样品重量和温度速率。我们发现，在空气存在的情况下，加热速率在燃烧过程中起主要作用，导致 CNT 开始发生氧化的温度升高，最高可达约 100 °C（从 1 °C min-1 到 50 °C min-1）。在所有评估的系统中都观察到相同的趋势，即 N 掺杂 CNT、机械剥离产生的石墨烯和 N 掺杂还原石墨烯样品。TGA 分析了其他方面，例如评估样品中是否存在杂质或结构缺陷，突出了该技术在提供碳材料结构方面和特性信息的多功能性和有用性。最后，推荐了一组 TGA 参数用于碳纳米材料的分析，以获得可靠的数据。

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Thermal Stability and Purity of Graphene and Carbon Nanotubes: Key Parameters for Their Thermogravimetric Analysis (TGA)

Thermal analysis is widely employed for the characterization of nanomaterials. It encompasses a variety of techniques that allow the evaluation of the physicochemical properties of a material by monitoring its response under controlled temperature. In the case of carbon nanomaterials, such as carbon nanotubes and graphene derivatives, thermogravimetric analysis (TGA) is particularly useful to determine the quality and stability of the sample, the presence of impurities and the degree of functionalization or doping after post-synthesis treatments. Furthermore, TGA is widely used to evaluate the thermal stability against oxidation by air, which can be, for instance, enhanced by the purification of the material and by nitrogen doping, finding application in areas where a retarded combustion of the material is required. Herein, we have evaluated key parameters that play a role in the data obtained from TGA, namely, gas flow rate, sample weight and temperature rate, used during the analysis. We found out that the heating rate played the major role in the process of combustion in the presence of air, inducing an increase in the temperature at which the oxidation of CNTs starts to occur, up to ca. 100 °C (from 1 °C min−1 to 50 °C min−1). The same trend was observed for all the evaluated systems, namely N-doped CNTs, graphene produced by mechanical exfoliation and N-doped reduced graphene samples. Other aspects, like the presence of impurities or structural defects in the evaluated samples, were analyzed by TGA, highlighting the versatility and usefulness of the technique to provide information of structural aspects and properties of carbon materials. Finally, a set of TGA parameters are recommended for the analysis of carbon nanomaterials to obtain reliable data.

更新日期：2024-10-31

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