Aligned single-walled carbon nanotubes by Langmuir-Blodgett technique

作者：Jia, Lu; Zhang, Yafei^*; Li, Jinyong; You, Chang; Xie, Erqing

来源：Journal of Applied Physics, 2008, 104(7): 074318.

DOI：10.1063/1.2996033

• Aligned single-walled carbon nanotubes
• Compression speed
• Field emission scanning electron microscopy
• Langmuir Blodgett techniques
• Layer by layer deposition
• Single-walled carbon nanotube (SWNTs)
• Surface pressure area isotherms
• UV-VIS absorption spectra

Single-walled carbon nanotubes (SWNTs) were chemically functionalized with amphiphilic octadecylamine after purification. Lower density and highly oriented SWNTs were obtained via Langmuir-Blodgett (LB) technique. A model was introduced to explain the compression-induced alignment. The phase behavior of the spreading monolayer was studied by surface pressure-area isotherms at different temperatures and different compression speeds. The transferred LB films of SWNTs with different mean lengths were investigated by the field emission scanning electron microscopy, showing that SWNTs with average length at 1000-2000 nm have more preference of reorientation upon compression than shorter ones (similar to 500 nm), while SWNTs that are too long (similar to 3000 nm) would tangle together and the reorientation is weaker. Multilayers (up to 18 layers) of SWNTs were obtained with high transfer ratios (>0.93) and the UV-vis absorption spectra indicated that the layer-by-layer deposition was successful.

• 出版日期2008-10-1
• 单位兰州大学; 上海交通大学