Formation of single-walled carbon nanotube thin films enriched with semiconducting nanotubes and their application in photoelectrochemical devices.
Formation of single-walled carbon nanotube thin films enriched with semiconducting nanotubes and their application in photoelectrochemical devices.
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DOI：
10.1039/c0nr00986e
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发表时间：
2011-04
期刊：
影响因子：
6.7
通讯作者：
Li Wei;Noriyasu Tezuka;T. Umeyama;H. Imahori;Yuan Chen
中科院分区：
文献类型：
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作者：
Li Wei;Noriyasu Tezuka;T. Umeyama;H. Imahori;Yuan Chen
采用凝胶离心法制备了含有高密度半导体纳米管的单壁碳纳米管（SWCNT）薄膜。优化琼脂糖凝胶浓度和离心力以在0.1重量%琼脂糖凝胶和18，000 g下实现高的半导体和金属纳米管分离效率。单壁碳纳米管薄膜的厚度可以精确地控制在65至260 nm之间，并具有可调节的透明度。这些单壁碳纳米管薄膜应用于光电化学器件。由半导体SWCNT富集膜产生的光电流比由未分选的SWCNT膜产生的光电流高15-35%。这是因为金属纳米管的去除减少了激子复合通道。较薄的薄膜产生较高的光电流，因为电荷载流子在到达电极之前在金属纳米管中复合的机会较少。开发更可扩展和选择性的高纯度半导体单壁碳纳米管的方法是重要的，以进一步提高光电流产生效率，通过使用基于单壁碳纳米管的光电化学器件。
Single-walled carbon nanotube (SWCNT) thin films, containing a high-density of semiconducting nanotubes, were obtained by a gel-centrifugation method. The agarose gel concentration and centrifugation force were optimized to achieve high semiconducting and metallic nanotube separation efficiency at 0.1 wt% agarose gel and 18,000g. The thickness of SWCNT films can be precisely controlled from 65 to 260 nm with adjustable transparency. These SWCNT films were applied in photoelectrochemical devices. Photocurrents generated by semiconducting SWCNT enriched films are 15-35% higher than those by unsorted SWCNT films. This is because of reducing exciton recombination channels as a result of the removal of metallic nanotubes. Thinner films generate higher photocurrents because charge carriers have less chances going in metallic nanotubes for recombination, before they can reach electrodes. Developing more scalable and selective methods for high purity semiconducting SWCNTs is important to further improve the photocurrent generation efficiency by using SWCNT-based photoelectrochemical devices.