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铬酸及硝酸混合液处理以增强碳纳米管场发射 总被引:1,自引:0,他引:1
为了修饰碳纳米管(CNTs)的表面型态及改变碳纳米管的表面结构, 进一步增强碳纳米管的场发射特性, 使用铬酸及硝酸的混合溶液对碳纳米管进行后处理. 采用SEM、TEM、Raman 和EDS测试手段对样品的形貌、表面成份组成和微观结构特征进行了表征. 场发射(FE)的数据显示, 经过铬酸及硝酸的混合溶液处理20 min的碳纳米管场发射电流比未经任何处理的碳纳米管场发射电流明显增加一个数量级以上, 场发射电流增强的主要原因为样品上的碳纳米管的表面型态的改变, 造成碳纳米管场发射增强因子茁的增大. 与单独使用硝酸溶液后处理比较, 使用铬酸及硝酸的混合溶液对碳纳米管进行后处理可以得到较高的场发射电流及较低的起始电场. 铬酸及硝酸的混合溶液处理方法能经济且有效增强碳纳米管的场发射特性. 相似文献
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The movement of a particle could be depicted by the Mandelbrot set from the fractal viewpoint. According to the requirement, the movement of the particle needs to show different behaviors. In this paper, the feedback control method is taken on the classical Mandelbrot set. By amending the feedback item in the controller, the control method is applied to the generalized Mandelbrot set and by taking the reference item to be the trajectory of another system, the synchronization of Mandelbrot sets is achieved. 相似文献
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In this paper,the conception of fractal geometry derived from geometric inversion isintroduced.A ramified self-inverse fractal with symmetry and a self-inverse fractal dust setare constructed.The authors extend the conception of the fractal osculation and propose anew notion—fractal envelope.Finally,two examples of self-inverse fractal(soap and egg)are given. 相似文献
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Transport of Spin-Polarized Current Through a Mesoscopic Ring with Two Leads Induced by Aharonov-Bohm and Aharonov-Casher Phases 下载免费PDF全文
We study the transport of spin-polarized current induced by the Aharonov-Bohm and Aharonov-Casher phases in a mesoscopic ring with two leads in the presence of a cylindrically symmetric electric field and the magnetic flux at the centre of the same ring. An exact solution for the quantum transport is obtained. It is shown that the transport spin-polarized current and its polarizability can be controlled by the electric field and the magnetic flux as well. 相似文献