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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20min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β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.
In order to modify the surface morphology of carbon nanotubes (CNTs) and change the surface structure of CNTs, the field emission properties of CNTs were further enhanced, and the CNTs were treated by a mixed solution of chromic acid and nitric acid. TEM, Raman and EDS were used to characterize the morphology, surface composition and microstructure of the samples.The data of field emission (FE) showed that the carbon nanotube field emission current of 20min after mixed solution of chromic acid and nitric acid The field emission current of CNTs increased by more than one order of magnitude compared with that of untreated CNTs. The increase of field emission current was mainly due to the change of the surface morphology of the CNTs on the sample and the increase of field emission enhancement factor β Large.Compared with the single treatment of nitric acid solution, the higher field emission current and lower initial electric field can be obtained by using the mixed solution of chromic acid and nitric acid for the post-treatment of the carbon nanotubes.The mixed solution of chromic acid and nitric acid The method can economically and effectively enhance the field emission characteristics of carbon nanotubes.