Photoresponse in Self-Assembled Films of Carbon Nanotubes
Photoresponse in Self-Assembled Films of Carbon Nanotubes
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DOI：
10.1021/jp803477t
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发表时间：
2008-07
影响因子：
3.7
通讯作者：
Yumeng Shi;Dongliang Fu;D. H. Marsh;G. Rance;A. Khlobystov;Lain‐Jong Li
中科院分区：
文献类型：
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作者：
Yumeng Shi;Dongliang Fu;D. H. Marsh;G. Rance;A. Khlobystov;Lain‐Jong Li
水溶性单壁碳纳米管（SWNT;具有羧基官能团）在水-戊烷界面上自组装。获得了由两种不同类型的纳米管形态组成的超薄（<30 nm）膜，即纳米管的宽束与薄束（或单个）管的网络交织。这些薄膜高度均匀且足够坚固，可以从液体界面转移并沉积到二氧化硅、石英或塑料等固体基底上。在正常条件下，这种膜的电导是金属样的，并通过单壁碳纳米管束的电荷载流子的运输占主导地位。然而，结构内的半导体单壁碳纳米管可以容易地接受来自光学活性共轭聚合物中产生的激子的电荷载流子（空穴），在吸收可见光时。在界面SWNT−聚合物薄膜中，光刺激的电荷载流子浓度的增加导致了可测量的电导变化，该变化线性地依赖于温度。
Water-soluble single-walled carbon nanotubes (SWNT; with carboxylic functionalities) were self-assembled on a water−pentane interface. Ultrathin (<30 nm) films consisting of two distinct types of nanotube morphologies, wide bundles of nanotubes interwoven with a network of thin bundled (or individual) tubes, were obtained. The films were highly homogeneous and sufficiently robust to be transferred from the liquid interface and deposited onto solid substrates such as silica, quartz, or plastic. Under normal conditions the electrical conductance of such films is metal-like and is dominated by the transport of charge carriers through bundles of SWNT. However, semiconducting SWNT within the structure can readily accept charge carriers (holes) from excitons generated in optically active conjugated polymers upon absorption of visible light. This increase in concentration of charge carriers stimulated by light in interfacial SWNT−polymer films results in a measurable conductance change that depends linearly on t...