元素分析仪法测定石墨烯粉体中碳、氢、氮、硫、氧含量的影响因素探讨

The Discussion on the Influencing Factors of Carbon, Hydrogen, Nitrogen, Sulfur and Oxygen Content in Graphene Powder Determined by Element Analyzer

摘要: 石墨烯具有优异的电学、光学、力学、热学等性能，是我国前沿新材料的重点发展领域。石墨烯粉体作为当前市场上石墨烯材料存在的主要产品形式之一，在导电材料、储能材料、防腐材料、电热材料、复合材料等诸多领域已获得广泛的研究与应用。目前，石墨烯粉体因不同的制备工艺与原料等原因，导致材料碳、氢、氮、硫、氧元素的含量差异较大，进而直接对其后续应用与改性造成巨大影响。因此，准确检测石墨烯粉体主要元素含量对其应用具有重要影响。元素分析仪作为一种能够准确测量元素含量设备，常用来测定石墨烯材料中碳、氢、氧、氮、硫等元素的含量，但日常测试过程中较少关注样品前处理等因素对测试结果的影响，因此，本文重点考察了样品恒重前处理、样品称样量、包裹材料、气体流速等因素对其结果的影响，并优化推荐了采用元素分析仪法测试石墨烯粉体碳、氢、氮、硫、氧元素含量的测试条件。

Abstract: Graphene, with excellent electrical, optical, mechanical, thermal and other properties, is the frontier of our new materials focus on the development of the field. Graphene powder is one of the main product forms of graphene materials in the current market, it has been widely studied and applied in many fields, such as conductive material, energy storage material, anticorrosion material, electrothermal material, composite material and so on. At present, the content of carbon, hydrogen, nitrogen, sulfur and oxygen in graphene powder varies greatly due to different preparation processes and raw materials, and then directly to its follow-up application and modification of a huge impact. Therefore, accurate determination of the content of major elements in graphene powder has an important effect on its application. As a kind of equipment which can accurately measure the element content, the element analyzer is often used to measure the content of carbon, hydrogen, oxygen, nitrogen and sulfur in the graphene material, but in the daily testing process, less attention is paid to the influence of sample pretreatment and other factors on the test results, therefore, in this paper, the effects of constant weight pretreatment, sample weighing, packing material and gas flow rate on the results were investigated, the testing conditions of carbon, hydrogen, nitrogen, sulfur and oxygen in graphene powder by element analyzer were optimized.