Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
J Am Chem Soc. 2010 Nov 24;132(46):16581-6. doi: 10.1021/ja1067367. Epub 2010 Oct 28.
Transparent and conductive single-walled carbon nanotube (SWNT) films are of great importance to a number of applications such as optical and electronic devices. Here, we describe a simple approach for preparing free-standing highly conductive transparent SWNT films with a 20-150 nm thickness by spray coating from surfactant-dispersed aqueous solutions of SWNTs synthesized by an improved floating-catalyst growth method. After the HNO(3) treatment, dipping the SWNT films supporting on glass substrates in water resulted in a quick and nondestructive self-release to form free-standing ultrathin SWNT films on the water surface. The obtained films have sufficiently high transmittance (i.e., 95%), a very low sheet resistance (i.e., ∼120 Ω/sq), and a small average surface roughness (i.e., ∼3.5 nm for a displayed 10 × 10 μm area). Furthermore, the floating SWNT films on the water surface were easily transferred to any substrates of interest, without intense mechanical and chemical treatments, to preserve their original sizes and network structures. For example, the transferred SWNT films on poly(ethylene terephthalate) films are mechanically flexible, which is a great advantage over conventional indium-tin oxide (ITO) and therefore strongly promise to be "post ITO" for many applications.
透明导电单壁碳纳米管 (SWNT) 薄膜在光学和电子器件等诸多应用中具有重要意义。在这里，我们描述了一种简单的方法，通过喷涂由改进的浮催化剂生长法合成的 SWNTs 的表面活性剂分散水溶液，制备具有 20-150nm 厚度的独立式高导电透明 SWNT 薄膜。经过 HNO(3)处理后，将玻璃基底上支撑的 SWNT 薄膜浸入水中，会迅速、无损地自动释放，在水面上形成独立式超薄 SWNT 薄膜。所得到的薄膜具有足够高的透光率（即 95%）、非常低的方阻（即约 120 Ω/sq）和小的平均表面粗糙度（即 3.5nm，显示面积为 10×10μm）。此外，水面上的漂浮 SWNT 薄膜很容易转移到任何感兴趣的基底上，而无需强烈的机械和化学处理，以保持其原始尺寸和网络结构。例如，转移到聚对苯二甲酸乙二醇酯薄膜上的 SWNT 薄膜具有机械柔韧性，这与传统的铟锡氧化物（ITO）相比具有很大的优势，因此强烈承诺在许多应用中成为“ITO 之后”的替代品。
