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首页> 美国卫生研究院文献>Materials >UV Spectrometric Indirect Analysis of Brominated MWCNTs with UV Active Thiols and an Alkene—Reaction Kinetics Quantification and Differentiation of Adsorbed Bromine and Oxygen
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UV Spectrometric Indirect Analysis of Brominated MWCNTs with UV Active Thiols and an Alkene—Reaction Kinetics Quantification and Differentiation of Adsorbed Bromine and Oxygen

机译：含紫外活性硫醇和烯烃的溴化多壁碳纳米管的紫外光谱间接分析—吸附的溴和氧的反应动力学定量和区分

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Indirect UV-absorption spectrometry was shown to be a valuable tool for chemical characterization of functionalized carbon nanotubes (CNTs). It complements data from X-ray photoelectron spectroscopy (XPS) or FTIR analysis since it helps to clarify the type and concentration of functional groups. The principles of indirect application of UV-spectrometry and its mathematical interpretation are discussed. Their facile application, together with their adequate sensitivity and high flexibility, make UV-absorption-based approaches a valuable alternative to fluorescence spectrometry. Here, the approach was applied to the chemical analysis of oxidizing substances on CNTs. For this, pristine CNTs of low but finite oxygen content as well as brominated CNTs were analyzed by reaction in suspension with UV-active thiol reagents and a styrene derivative. It was shown that carefully selected reagents allow differentiation and quantification of bromine and generally oxidizing entities like oxygen. For brominated CNTs, it was shown that physisorbed bromine may dominate the overall bromine content.
机译：间接紫外吸收光谱法被证明是对功能化碳纳米管（CNT）进行化学表征的有价值的工具。它有助于阐明功能基团的类型和浓度，因此可以补充X射线光电子能谱（XPS）或FTIR分析的数据。讨论了紫外光谱间接应用的原理及其数学解释。它们的简便应用以及足够的灵敏性和高柔韧性使基于紫外线吸收的方法成为荧光光谱法的宝贵替代品。在这里，该方法被应用于碳纳米管上氧化性物质的化学分析。为此，通过与紫外光活性硫醇试剂和苯乙烯衍生物的悬浮液反应，分析了氧含量低但数量有限的原始碳纳米管以及溴化碳纳米管。结果表明，精心选择的试剂可以区分和定量分析溴以及通常氧化的实体，例如氧气。对于溴化碳纳米管，研究表明，物理吸附的溴可能占总溴含量的主导。

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