Comparative study of carbon nanotube dispersion using surfactants
Comparative study of carbon nanotube dispersion using surfactants
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DOI：
10.1016/j.jcis.2008.09.015
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发表时间：
2008-12-15
影响因子：
9.9
通讯作者：
Bharadwaj, Lalit M.
中科院分区：
文献类型：
--
作者：
Rastogi, Richa;Kaushal, Rahul;Bharadwaj, Lalit M.
碳纳米管（CNTs）的分散对于其在纳米器件应用中的利用是具有挑战性的任务。比较了Triton X-100、Tween 20、Tween 80和十二烷基硫酸钠（SDS）四种表面活性剂对多壁碳纳米管（MWNTs）的分散性。在四种表面活性剂中，Triton X-100和SDS分别提供最大和最小的分散。采用紫外可见光谱和透射电子显微镜（TEM）对多壁碳纳米管的分散性进行了表征。TEM结果与紫外-可见光谱测量结果一致。实验观察到的表面活性剂的分散能力的趋势与它们的化学结构是一致的。已确定每种表面活性剂的最佳CNT与表面活性剂的比例。该参数被示出显著影响纳米管分散。表面活性剂浓度高于或低于该比例显示出恶化纳米管分散体的质量。TEM分析的高表面活性剂浓度的样品，使我们能够构建一个合理的机制，减少在CNT分散在高表面活性剂浓度，与紫外可见光观察。表面活性剂的温度稳定性是影响CNT分散体质量的另一个重要因素。(C)2008年爱思唯尔公司All rights reserved.
Dispersion of carbon nanotubes (CNTs) is a challenging task for their utilization in nanoscale device applications. This account reports a comparative analysis on dispersion of muldwalled carbon nanotubes (MWNTs) with four surfactants-Triton X-100, Tween 20, Tween 80, and sodium dodecyl sulfate (SDS). Among the four surfactants, Triton X-100 and SDS provide maximum and minimum dispersion, respectively. Dispersion of MWNTs has been characterized with UV-vis spectroscopy and transmission electron microscopy (TEM). TEM results are in agreement with the UV-vis measurements. The experimentally observed trend of dispersing power of surfactants is consistent with their chemical structures. An optimum CNT-to-surfactant ratio has been determined for each surfactant. This parameter is shown to affect the nanotube dispersion significantly. Surfactant concentration above or below this ratio is shown to deteriorate the quality of nanotube dispersion. TEM analysis of a high-surfactant-concentration sample enables us to construct a plausible mechanism for decrease in CNT dispersion at high surfactant concentration, consistent with the UV-vis observations. Temperature stability of the surfactant is another important factor affecting the quality of CNT dispersion. (C) 2008 Elsevier Inc. All rights reserved.