利用紫外可见光谱对碳纳米管在水分散体中的剥离过程进行时间依赖性研究。

Time-dependent study of the exfoliation process of carbon nanotubes in aqueous dispersions by using UV-visible spectroscopy.

作者信息

Grossiord Nadia, Regev Oren, Loos Joachim, Meuldijk Jan, Koning Cor E

机构信息

Laboratory of Polymer Chemistry, Laboratories of Polymer Technology and Materials and Interface Chemistry, Process Development Group, Technical University of Eindhoven, Postbus 513, 5600 MB Eindhoven, The Netherlands.

出版信息

Anal Chem. 2005 Aug 15;77(16):5135-9. doi: 10.1021/ac050358j.

DOI:10.1021/ac050358j

PMID:16097750

Abstract

In this paper we demonstrate that the sonication-driven exfoliation of aggregates and bundles of single-wall carbon nanotubes (SWNTs) in an aqueous surfactant solution can be easily monitored by UV-vis spectroscopy. The different stages of the exfoliation process were directly visualized by cryogenic temperature transmission electron microscopy, showing an excellent correspondence with the spectroscopic data: the maximum achievable exfoliation (which does not mean that 100% of the NTs are effectively exfoliated) corresponds to the maximum UV-vis absorbance of the NT solution. Moreover, it has been observed that NTs produced by the arc-discharge technology (Carbolex NTs) require less energy to achieve maximum exfoliation than NTs produced by chemical vapor deposition (HiPCO NTs). This difference is attributed to weaker van der Waals attraction between Carbolex NTs in the bundles and aggregates.

摘要

在本文中，我们证明了在水性表面活性剂溶液中，通过超声驱动对单壁碳纳米管（SWNTs）的聚集体和管束进行剥离，可以很容易地用紫外可见光谱法进行监测。通过低温透射电子显微镜直接观察到了剥离过程的不同阶段，结果表明其与光谱数据具有极佳的对应关系：可实现的最大剥离程度（这并不意味着100%的纳米管都被有效剥离）对应于纳米管溶液的最大紫外可见吸光度。此外，还观察到，与通过化学气相沉积法制备的纳米管（HiPCO纳米管）相比，通过电弧放电技术制备的纳米管（Carbolex纳米管）在实现最大剥离时所需的能量更少。这种差异归因于管束和聚集体中Carbolex纳米管之间较弱的范德华吸引力。