Transferable Thin Films of Pristine Carbon Nanotubes
Transferable Thin Films of Pristine Carbon Nanotubes
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DOI：
10.1166/jnn.2011.3729
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发表时间：
2011-04-01
影响因子：
--
通讯作者：
Tang, Xiaowu (Shirley)
中科院分区：
文献类型：
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作者：
Mandal, Himadri Shekhar;Ward, Andrew;Tang, Xiaowu (Shirley)
我们在这里描述了一种简单且低成本的方法来制备超薄、均匀且可转移的原始碳纳米管（CNT）薄膜。高效的化学气相沉积（CVD）生长方法涉及二氧化硅负载的催化剂和作为气态碳源的醇蒸气。通过改变催化剂的量，合成薄膜的厚度可以轻松地以受控方式从 20 nm（亚单层）调整到 150 nm。高分辨率透射电子显微镜（HRTEM）显示薄膜主要由单壁碳纳米管和一小部分双壁碳纳米管组成。观察到薄膜电导率和厚度之间的非线性关系。我们的亚单层（类似于 20 nm）薄膜明显比使用其他方法合成的导电 CNT 薄膜（通常 > 50 nm，最多类似于 100 μm）薄，显示出 400 mho 的最高电导率。 cm(-1) 在可见光范围内具有接近 90% 的透明度，在红外范围内接近 100% 的透明度。这种超薄膜还可以无载体膜地转移到各种基材上，包括用于柔性电子产品的低成本塑料。与通过过滤技术制备的碳纳米管薄膜相比，我们的薄膜表现出优异的抗机械弯曲稳定性。
We describe here a simple and low-cost method to prepare ultra-thin, homogeneous, and transferable films of pristine carbon nanotubes (CNTs). The highly efficient chemical vapor deposition (CVD) growth method involves silica supported catalysts and alcohol vapor as gaseous carbon source. By varying the amount of catalysts, the thickness of synthesized films can be easily tuned from 20 nm (sub-monolayer) to 150 nm in a controlled fashion. High-resolution transmission electron microscopy (HRTEM) revealed that the films are composed primarily of single-walled and a small fraction of double-walled CNTs. A nonlinear relationship between film conductivity and thickness was observed. Our sub-monolayer (similar to 20 nm) film, which is noticeably thinner than conductive CNT films synthesized using other methods (typically > 50 nm and up to similar to 100 mu m), shows the highest conductivity of 400 mho . cm(-1) with similar to 90% transparency in the visible range and close to 100% transparency in the infrared range. This ultra-thin film can also be transferred carrier-film free to a wide range of substrates including low-cost plastics for flexible electronics. Compared to CNT films prepared by filtration techniques, our films demonstrated superior stability against mechanical bending.