单壁碳纳米管薄膜制备及其光学特性研究  

Preparation of single-walled carbon nanotube film and its optical property

作　　者：宋秋艳[1] 陈根祥[2] 谭晓琳[1] 田恺[1] 

机构地区：[1]北京交通大学光波技术研究所全光网络与现代通信网教育部重点实验室,北京100044 [2]中央民族大学理学院,北京100081

出　　处：《激光技术》2014年第2期181-185,共5页Laser Technology

基　　金：国家自然科学基金资助项目(61275052)

摘　　要：为了将单壁碳纳米管制成实际可用的光电子器件,采用一种新的梯度升温热亚胺化法来制备单壁碳纳米管/聚酰亚胺薄膜。利用分光光度计测得单壁碳纳米管的质量分数为0.02的单壁碳纳米管/聚酰亚胺薄膜的反射谱、透射谱和吸收谱,得到薄膜线性折射率随波长的变化;拟合Sellmeyer公式,得到单壁碳纳米管/聚酰亚胺薄膜的Sellmeyer参量。利用z扫描技术研究了单壁碳纳米管/聚酰亚胺薄膜的3阶非线性特性。结果表明,单壁碳纳米管/聚酰亚胺薄膜具有很强的饱和吸收特性,其非线性吸收系数为β=-5.3×10-10cm/W;并且具有较强的自散焦效应,对应的非线性折射系数为γ=-4.1×10-13cm2/W。单壁碳纳米管/聚酰亚胺薄膜具有较强的非线性光学特性。In order to prepare actual optoelectronic devices using single-walled carbon nanotubes , single-walled carbon nanotube/polyimide （ SWCNT/PI ） film with the single-walled carbon nanotubes in mass fraction of 0.02 was prepared by means of a new gradient temperature-elevating thermal imidization method .The reflectance , transmittance , and absorbance of the film were measured with a spectrophotometer and the linear refractive index variation with wavelength of SWCNT/PI film was obtained .Simultaneously , the Sellmeyer parameters of the SWCNT/PI film were got by fitting the Sellmeyer formula .Then, the third order nonlinear optical property of the SWCNT /PI film was studied by means of z-scanning.The experiments showed that the nonlinear absorption coefficient and the nonlinear refractive coefficient of the film were -5.3 ×10 -9cm/W and -4.1 ×10 -13cm2/W, respectively.The results prove that SWCNT/PI film owns strong nonlinear optical property .

关 键 词：薄膜 单壁碳纳米管 聚酰亚胺 分光光度计 Sellmeyer公式 Z扫描 3阶非线性特性 

分 类 号：O484.4[理学—固体物理]