Water-filled single-wall carbon nanotubes as molecular nanovalves
Water-filled single-wall carbon nanotubes as molecular nanovalves
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DOI：
10.1038/nmat1823
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发表时间：
2007-02-01
期刊：
影响因子：
41.2
通讯作者：
Kataura, Hiromichi
中科院分区：
文献类型：
--
作者：
Maniwa, Yutaka;Matsuda, Kazuyuki;Kataura, Hiromichi
已知在低温下，单壁碳纳米管（water-SWNTs）内的水经历结构转变以形成管状固体结构。所得到的冰NT是中空圆柱体，其直径与典型气体分子的直径相当。因此，冰-和水-单壁碳纳米管的气体吸附性能是感兴趣的。在这里，我们进行了第一次系统的调查水单壁碳纳米管在各种气体气氛下低于0.1 MPa的电阻，X-射线衍射，NMR测量和分子动力学计算的稳定性。结果发现，水单壁碳纳米管的电阻率表现出显着增加，在低于临界温度Tc，在其中一个特定类型的大气气体分子进入单壁碳纳米管在开关的方式在气体气氛。基于这一现象，提出了水-单壁碳纳米管可以用于制备新型的分子纳米阀。
It is known that at low temperature, water inside single-wall carbon nanotubes (water-SWNTs) undergoes a structural transition to form tube-like solid structures. The resulting ice NTs are hollow cylinders with diameters comparable to those of typical gas molecules. Hence, the gas-adsorption properties of ice- and water-SWNTs are of interest. Here, we carry out the first systematic investigation into the stability of water-SWNTs in various gas atmospheres below 0.1 MPa by means of electrical resistance, X-ray diffraction, NMR measurements and molecular dynamics calculations. It is found that the resistivity of water-SWNTs exhibits a significant increase in gas atmospheres below a critical temperature T-c, at which a particular type of atmospheric gas molecule enters the SWNTs in an on-off fashion. On the basis of this phenomenon, it is proposed that water-SWNTs can be used to fabricate a new type of molecular nanovalve.