Department of Materials Science and Engineering, Yonsei University, Seoul, Korea.
Nanotechnology. 2011 Jul 1;22(26):265709. doi: 10.1088/0957-4484/22/26/265709. Epub 2011 May 17.
Solution-deposited single-walled carbon nanotube (SWCNT) films contain a surfactant material and it should be removed by a post-deposition treatment to improve the conductivity. We here report that the sodium dodecyl sulfate (SDS) surfactant in SWCNT films can be completely removed by a pulsed Nd:YAG laser (wavelength = 1064 nm, pulse width = 99 ms). SWCNT films were spray-coated onto a glass substrate and were scanned by a laser beam of 2 mm size. In this process, individual nanotubes absorb the laser energy and generate heat to vaporize the surrounding surfactant. This mechanism was supported by the fact that the required pulse energy decreased as the SWCNT density increased. An encouraging feature is that unlike typical acid treatments, the laser treatment can improve not only the conductivity but also the transmittance. This might be associated with complete surfactant removal without leaving any particulate debris. For a film, the sheet resistance decreased from 1.07 kΩ/sq to 700 Ω/sq and its visible transmittance simultaneously increased by 4%.
溶液沉积的单壁碳纳米管 (SWCNT) 薄膜含有表面活性剂材料，应通过后沉积处理去除，以提高导电性。我们在此报告，SWCNT 薄膜中的十二烷基硫酸钠 (SDS) 表面活性剂可以通过脉冲 Nd:YAG 激光（波长 = 1064nm，脉冲宽度 = 99ms）完全去除。SWCNT 薄膜通过喷涂涂覆到玻璃基底上，并通过 2mm 尺寸的激光束进行扫描。在这个过程中，单个纳米管吸收激光能量并产生热量，从而将周围的表面活性剂蒸发。事实上，所需的脉冲能量随着 SWCNT 密度的增加而降低，这支持了这种机制。一个令人鼓舞的特点是，与典型的酸处理不同，激光处理不仅可以提高导电性，还可以提高透光率。这可能与完全去除表面活性剂而不留下任何颗粒碎片有关。对于薄膜，方阻从 1.07kΩ/sq 降低到 700Ω/sq，其可见光透过率同时提高了 4%。
