The 1/f noise in multiwalled carbon nanotubes

The $1/f$ noise in multiwalled carbon nanotubes bundles has been investigated between the frequency range of 0.1 to 30 Hz. At room temperature the noise spectrum is standard 1/f, and its level is proportional to the square of the bias voltage. With decreasing temperature the noise level also decreases. At 4.2 K the noise level follows a non-monotonic dependence against the bias voltage, showing a peak at a certain bias voltage, meanwhile its frequency dependence also deviates from the 1/f trend. This anomalous behaviour is discussed within the picture of environmental quantum fluctuation of charge transport in the samples.     

对电弧放电制备的离散碳纳米管进行高温氧化的研究

用改进的电弧放电方法制备了大量离散分布的碳纳米管.对此种碳纳米管样品在空气中进行了高温氧化处理，研究表明此种碳纳米管能够在较高温度和较长时间的氧化处理后仍能保存下来.离散分布的碳纳米管可在一定程度上减少其结构中的缺陷和不完整性，因而提高了纳米管在氧化处理过程中的稳定性.这一观点得到了Raman研究结果的支持.     

超长、开口定向碳纳米管列阵的制备 *

以碳氢气体为反应物 ,利用化学气相沉积方法 ,在均匀分布着纳米Fe/SiO₂颗粒的SiO₂ 基底上生长出长度达2mm的超长定向碳纳米管列阵 ,该超长碳纳米管的长度比现有碳纳米管的长度(1～100 μm)高1～2个数量级 .研究了碳纳米管的形貌和结构 ,发现碳纳米管的根部呈自然开口状态 .初步讨论了超长、开口碳纳米管的生长机制 .     

超长定向碳纳米管列阵的制备

利用化学气相沉积方法,成功地制备出长度达２ｍｍ的超长定向碳纳米管列阵,该超长碳人米管的长度经现有碳纳米管的长度高１－２个数量级。     

STRUCTURE AND MORPHOLOGY OF CARBON NANOTUBES GROWN ON ZEOLITE-SUPPORTED CATALYSTS BY CHEMICAL VAPOR DEPOSITION

The zeolite-supported catalysts were prepared in nickel and cobalt nitrate aqueous solutions by ion exchange method. After reducing these substrates by hydrogen, we grew carbon nanotubes on them by chemical vapor deposition under different conditions. The results reveal that nickel/zeolite, cobalt/zeolite and nickel+cobalt/zeolite have different optimal conditions. When nickel+cobalt/zeolite was used as the catalyst, we can get straight carbon nanotubes. The Raman spectrum of the straight nanotubes shows they have fewer defects. We propose a growth mechanism for the growth of these nanotubes.