Use of Raman spectroscopy to identify carbon nanotube contamination at an analytical balance workstation.
Use of Raman spectroscopy to identify carbon nanotube contamination at an analytical balance workstation.
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DOI：
10.1080/15459624.2016.1191639
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发表时间：
2016-12
影响因子：
2
通讯作者：
Pantano P
中科院分区：
文献类型：
--
作者：
Braun EI;Huang A;Tusa CA;Yukica MA;Pantano P
碳纳米管（CNTs）是具有多种商业应用的圆柱形碳分子。碳纳米管重量轻，易于空气传播，并且已被证明在生产和使用的各个阶段释放。因此，随着全球碳纳米管产量的增加，人们担心碳纳米管可能对接触它们的人构成安全威胁。因此，必须充分了解CNT释放情景，以进行准确的风险评估并实施有效的控制措施。然而，目前用于监测工作场所中CNT释放的一套直接读取和离线仪器缺乏高化学特异性，这使得在单个地点进行采样和/或测量时的风险评估复杂化，其中在存在天然存在的背景颗粒或灰尘的情况下处理多种CNT类型。在这里，我们证明了拉曼光谱的效用，明确地确定是否从多用户分析平衡工作站收集的颗粒物质包括碳纳米管，以及污染物是否包括由Ni/Y催化电弧法或Co/Mo催化化学气相沉积法合成的碳纳米管。通过了解所涉及的金属杂质，确定确切的CNT类型产生了更准确的风险评估，并且还确定了处理这些CNT的用户，审查了他们的处理技术，并改进了安全称重CNT的协议。
Carbon nanotubes (CNTs) are cylindrical molecules of carbon with diverse commercial applications. CNTs are also lightweight, easily airborne, and have been shown to be released during various phases of production and use. Therefore, as global CNT production increases, so do concerns that CNTs could pose a safety threat to those who are exposed to them. This makes it imperative to fully understand CNT release scenarios to make accurate risk assessments and to implement effective control measures. However, the current suite of direct-reading and off-line instrumentation used to monitor the release of CNTs in workplaces lack high chemical specificity, which complicates risk assessments when the sampling and/or measurements are performed at a single site where multiple CNT types are handled in the presence of naturally-occurring background particles, or dust. Herein, we demonstrate the utility of Raman spectroscopy to unequivocally identify whether particulate matter collected from a multi-user analytical balance workstation comprised CNTs, as well as, whether the contamination included CNTs that were synthesized by a Ni/Y-catalyzed electric-arc method or a Co/Mo-catalyzed chemical vapor deposition method. Identifying the exact CNT type generated a more accurate risk assessment by knowing the metallic impurities involved, and it also led to the identification of the users who handled these CNTs, a review of their handling techniques, and an improved protocol for safely weighing CNTs.
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