Yang De-Quan, Rochette Jean-Francois, Sacher Edward
Regroupement Québécois de Matériaux de Pointe, Département de Génie Physique, Ecole Polytechnique, C.P. 6079, succursale Centre-Ville, Montréal, Québec H3C 3A7, Canada.
J Phys Chem B. 2005 Apr 28;109(16):7788-94. doi: 10.1021/jp045147h.
Sonication has been widely used in the dispersal of carbon nanotubes (CNTs) in various liquids as well as in their functionalization in aqueous acids. Here, for the first time, we study the sonication of multiwalled CNTs (MWCNTs) in deionized water. Our results indicate an improvement in the aqueous dispersal of MWCNTs as well as an increase in their adhesive interaction with Au substrates. Field emission scanning electron and high-resolution transmission electron microscopies as well as X-ray photoelectron, photoacoustic Fourier transform IR, and Raman spectroscopies have shown this to be due to the production of low concentrations of O-containing functionalizations (alcohol, carbonyl, acid, with the total O concentration being approximately 2%), without damaging the basic CNT structure; this production of functional groups is mirrored by the disappearance of -CH(n) groups existing on the pristine CNTs. These new functional groups are capable of hydrogen bonding, which plays an important role in their aqueous dispersal and enhanced substrate interactions.
超声处理已广泛应用于碳纳米管（CNT）在各种液体中的分散以及在水性酸中的功能化。在此，我们首次研究了多壁碳纳米管（MWCNT）在去离子水中的超声处理。我们的结果表明，MWCNT在水中的分散性得到改善，并且它们与金基底的粘附相互作用增强。场发射扫描电子显微镜和高分辨率透射电子显微镜以及X射线光电子能谱、光声傅里叶变换红外光谱和拉曼光谱表明，这是由于产生了低浓度的含O官能团（醇、羰基、酸，总O浓度约为2%），而没有破坏基本的CNT结构；这些官能团的产生与原始CNT上存在的-CH(n)基团的消失相对应。这些新的官能团能够形成氢键，这在它们的水分散和增强的基底相互作用中起着重要作用。
