Selective photochemical functionalization of surfactant-dispersed single wall carbon nanotubes in water.
Selective photochemical functionalization of surfactant-dispersed single wall carbon nanotubes in water.
复制标题
表面活性剂分散在水中的单壁碳纳米管的选择性光化学功能化。
DOI：
10.1021/ja804164y
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发表时间：
2008
影响因子：
15
通讯作者：
J. Tour
中科院分区：
文献类型：
--
作者：
N. Alvarez;C. Kittrell;H. Schmidt;R. Hauge;P. Engel;J. Tour
单壁碳纳米管（SWCNTs）分散在表面活性剂中，紫外线（UV）照射导致纳米管的直径和类型选择性光羟基化。在酸性、中性和碱性水溶液中，在环境温度和升高的温度下，在254 nm UV照射后，确认了第一半导体和然后小直径金属单壁碳纳米管的光羟基化。通过X射线光电子能谱法检测到，UV照射后单壁碳纳米管的氧含量增加，表明单壁碳纳米管通过与水反应而被羟基化。衰减全反射傅里叶变换红外分析提供了其表面上羟基官能团的证据。这种光化学反应受到分子氧的阻碍，并且似乎涉及在半导体单壁碳纳米管附近产生的反应性中间体。这代表了液相中的无污染选择性反应，其使用管的固有特性。
Ultraviolet (UV) irradiation of single wall carbon nanotubes (SWCNTs) individually dispersed in surfactants leads to diameter and type-selective photohydroxylation of the nanotubes. Photohydroxylation of first semiconductor and then small diameter metallic SWCNTs was confirmed after 254 nm UV irradiation in acidic, neutral, and basic aqueous solutions at ambient and elevated temperatures. The increased oxygen content of the SWCNTs after UV irradiation, as detected by X-ray photoelectron spectroscopy, suggests that SWCNTs were hydroxylated by reaction with water. Attenuated total reflectance Fourier transform infrared analysis provides evidence of hydroxyl functional groups on their surface. This photochemical reaction is impeded by molecular oxygen and appears to involve a reactive intermediate generated in the vicinity of semiconducting SWCNTs. This represents a noncontaminating selective reaction in the liquid phase that uses an intrinsic property of the tubes.