Badaire Stéphane, Poulin Philippe, Maugey Maryse, Zakri Cécile
Langmuir. 2004 Nov 23;20(24):10367-70. doi: 10.1021/la049096r.
We show that the dimensions of carbon nanotubes (CNTs) in suspension can be characterized by depolarized dynamic light scattering. Taking advantages of this in situ technique, we investigate in detail the influence of sonication procedures on the length and diameter of CNTs in surfactant solutions. Sonication power is shown to be particularly efficient at unbundling nanotubes, whereas a long sonication time at low power can be sufficient to cut the bundles with limited unbundling. We finally demonstrate the influence of CNT dimensions on the electrical properties of CNT fibers. Slightly varying the sonication conditions, and thereby the suspended nanotube dimensions, can affect the fibers conductivity by almost 2 orders of magnitude.
我们表明，悬浮液中碳纳米管（CNT）的尺寸可以通过去偏振动态光散射来表征。利用这种原位技术，我们详细研究了超声处理程序对表面活性剂溶液中CNT长度和直径的影响。结果表明，超声功率在使纳米管解束方面特别有效，而低功率下长时间超声处理足以切割束状物且解束有限。我们最终证明了CNT尺寸对CNT纤维电学性能的影响。略微改变超声处理条件，进而改变悬浮纳米管的尺寸，可使纤维的电导率变化近2个数量级。
