Molecular absorption and desorption phenomena of SWNT single nanochannel processed by laser ablation process

用拉曼光谱法观察了单壁碳纳米管在其纳米通道中吸附水分子的情况，并比较了两种样品在相同条件下的光谱。采用垂直排列在硅衬底上的SWNT样品。其中一个样品没有被聚合物覆盖，而另一个样品被聚合物覆盖。在我们的实验中，利用纳秒脉冲激光制造了一个纳米通道。装有激光处理过的样品的细胞被放置在拉曼光谱平台上。SWNT成功地将水分子吸附在其纳米通道中。拉曼光谱主要观察径向呼吸模式（RBM）、d波段和g波段。RBM、d波段和g波段分别来源于径向振动频率、缺陷结构和石墨结构。在未被聚合物覆盖的样品中，由于水分子在表面或纳米通道中的吸附，RBM发生了位移和减小。

A single walled carbon nanotube, which adsorbed water molecule in its nano channel, was observed using Raman spectroscopy, and two sample's spectrums were compared under the same conditions. The SWNT samples that were vertically aligned on the silicon substrate were used. One of the samples was not covered by polymer whereas the other sample was covered by polymer. In our experiment, a nano channel was made using a nanosecond pulse laser. The cell with the laser-processed sample in it was set on the Raman spectroscopy's platform. The SWNT successfully adsorbed water molecule in its nano channel. With the Raman spectroscopy, Radial Breathing Mode (RBM), D-band, and G-band were mainly observed. The RBM, D-band, and G-band originated from radial vibration frequency, defective structure, and graphite structure respectively. One of the samples that is not covered by polymer showed the RBM shift and diminishing due to water molecules adsorption on the surface or in nano channel.