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首页> 外文期刊>Chemistry: A European journal >Microwave-Assisted Covalent Side wall Functionalization of Multiwalled Carbon Nanotubes
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Microwave-Assisted Covalent Side wall Functionalization of Multiwalled Carbon Nanotubes

机译：微波辅助多壁碳纳米管的共价侧壁功能化

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摘要

Thermal cycloaddition of 1,3-dipolar azomethine ylides to the side-walls of multiwalled carbon nanotubes(MWNTs)has been used to prepare MWNTs that contain 2-methylenethiol-4-(4-octadecyloxyphenyl)(4),N-octyl-2-(4-octadecyloxyphenyl)(5)or 2-(4-octadecyloxyphenyl)pyrrolidine(6)units.All these contain the 4-octadecyl-oxyphenyl substituent that acts as a solubilizing group.Microwave(MiW)-assisted heating was found to be highly efficient for soluble MWNTs,for which the amount of added groups after only 2h of MiW heating at 200 deg C,determined by using thermogravimetric analysis,was found to be in the same range as that obtained after 100-120 h of conventional heating of soluble and insoluble MWNTs.Solubility is a key feature for a successful MiW-heated reaction;MWNTs insoluble in the reaction medium yielded considerably less addends in the MiW-heated reactions than in the conventionally heated reaction.The location and even distribution of the pyrrolidine units over the outermost layer of the MWNTs was verified by transmission electron microscopy analysis of 4 that had been treated with gold nanoparticles and thoroughly washed to remove gold particles adsorbed on nonfunctionalized parts of the MWNTs.
机译：1,3-偶极偶氮甲亚胺基团在多壁碳纳米管（MWNTs）侧壁上的热环加成反应已用于制备包含2-亚甲基硫醇-4-（4-十八烷基氧苯基）（4），N-辛基-2的多壁碳纳米管-（4-十八烷基氧基苯基）（5）或2-（4-十八烷基氧基苯基）吡咯烷（6）单元，所有单元都含有4-十八烷基-氧苯基取代基作为增溶基团。发现微波（MiW）辅助加热对可溶性多壁碳纳米管具有很高的效率，通过热重分析测定，在200℃MiW加热仅2小时后，其添加基团的量与常规加热100-120小时后的范围相同溶解度是成功进行MiW加热反应的关键特征;与常规加热反应相比，不溶于反应介质的MWNT在MiW加热反应中产生的加成量要少得多。最外层的单位MWNTs通过透射电子显微镜分析对4个用金纳米颗粒处理并彻底洗涤以除去吸附在MWNTs非功能化部分上的金颗粒进行验证。

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