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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. 相似文献
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2017年2月11日元宵节,贵州省第二届《四路花灯闹元宵》大型文艺晚会在贵州福泉正式拉开序幕,贵州广播电视台独家现场直播,播出频道为贵州四套大众生活频道.此次晚会主会场设在黔南福泉,另外3个分会场有凯里镇远、安顺屯堡、遵义习水土城.为了做好这次晚会的直播工作,贵州广播电视台高度重视、精心策划,举全台之力多次组织精英强将奔赴现场实地考察,召开座谈协调会.并结合台里实际情况,制定出了一套高安全、高质量、高效率为一体的直播传输方案,保证了直播的圆满完成. 相似文献
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超长定向碳纳米管列阵的制备 总被引:9,自引:0,他引:9
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。 相似文献
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STRUCTURE AND MORPHOLOGY OF CARBON NANOTUBES GROWN ON ZEOLITE-SUPPORTED CATALYSTS BY CHEMICAL VAPOR DEPOSITION 下载免费PDF全文
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. 相似文献
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